Azure99/stackoverflow-qa-top-300k · Datasets at Hugging Face

1,399,605

How can I make my layout scroll both horizontally and vertically?

I am using a TableLayout. I need to have both horizontal and vertical scrolling for this layout. By default I am able to get vertical scrolling in the view but horizontal scrolling is not working. I am using Android SDK 1.5 r3. I have already tried <code>android:scrollbars="horizontal"</code>. I have read on some forums that in the cupcake update, horizontal scrolling is possible. How can I make my layout scroll in both directions?

1,409,629

8

0

null

2009-09-09 13:11:21.503 UTC

27

2022-02-15 14:43:19.547 UTC

2013-03-27 19:24:03.017 UTC

null

1,401,895

null

152,867

null

1

75

android|android-widget|android-scrollview

125,144

I was able to find a simple way to achieve both scrolling behaviors. Here is the xml for it: <pre><code><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:scrollbars="vertical"> <HorizontalScrollView android:layout_width="320px" android:layout_height="fill_parent"> <TableLayout android:id="@+id/linlay" android:layout_width="320px" android:layout_height="fill_parent" android:stretchColumns="1" android:background="#000000"/> </HorizontalScrollView> </ScrollView> </code></pre>

1,853,284

What's the difference between the message passing and shared memory concurrency models?

Correct me if I'm wrong, but I'm surprised this hasn't been asked before on here ...

1,853,317

10

0

null

2009-12-05 20:04:31.457 UTC

33

2020-05-14 11:29:04.807 UTC

null

1,348

null

1

58

concurrency|shared-memory|message-passing

83,046

It's a pretty simple difference. In a shared memory model, multiple workers all operate on the same data. This opens up a lot of the concurrency issues that are common in parallel programming. Message passing systems make workers communicate through a messaging system. Messages keep everyone seperated, so that workers cannot modify each other's data. By analogy, lets say we are working with a team on a project together. In one model, we are all crowded around a table, with all of our papers and data layed out. We can only communicate by changing things on the table. We have to be careful not to all try to operate on the same piece of data at once, or it will get confusing and things will get mixed up. In a message passing model, we all sit at our desks, with our own set of papers. When we want to, we can pass a paper to someone else as a "message", and that worker can now do what they want with it. We only ever have access to whatever we have in front of us, so we never have to worry that someone is going to reach over and change one of the numbers while we are in the middle of summing them up. Ok, silly analogy!

1,979,957

Maven dependency for Servlet 3.0 API?

How can I tell Maven 2 to load the Servlet 3.0 API? I tried: <pre class="lang-xml prettyprint-override"><code><dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>3.0</version> <scope>provided</scope> </dependency> </code></pre> I use <a href="http://repository.jboss.com/maven2/" rel="noreferrer">http://repository.jboss.com/maven2/</a> but what repository would be correct? Addendum: It works with a dependency for the entire Java EE 6 API and the following settings: <pre class="lang-xml prettyprint-override"><code><repository> <id>java.net</id> <url>http://download.java.net/maven/2</url> </repository> <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>6.0</version> <scope>provided</scope> </dependency> </code></pre> I'd prefer to only add the Servlet API as dependency, but "Brabster" may be right that separate dependencies have been replaced by Java EE 6 Profiles. Is there a source that confirms this assumption?

1,980,718

11

3

null

2009-12-30 12:29:40.633 UTC

81

2020-11-05 23:18:20.763 UTC

2012-09-26 13:24:31.74 UTC

null

384,674

null

238,134

null

1

236

java|maven-2|servlets|jakarta-ee

283,344

<blockquote> I'd prefer to only add the Servlet API as dependency, </blockquote> To be honest, I'm not sure to understand why but never mind... <blockquote> <a href="https://stackoverflow.com/users/2362/brabster">Brabster</a> separate dependencies have been replaced by Java EE 6 Profiles. Is there a source that confirms this assumption? </blockquote> The maven repository from Java.net indeed offers the following artifact for the WebProfile: <pre class="lang-xml prettyprint-override"><code><repositories> <repository> <id>java.net2</id> <name>Repository hosting the jee6 artifacts</name> <url>http://download.java.net/maven/2</url> </repository> </repositories> <dependencies> <dependency> <groupId>javax</groupId> <artifactId>javaee-web-api</artifactId> <version>6.0</version> <scope>provided</scope> </dependency> </dependencies> </code></pre> This jar includes Servlet 3.0, EJB Lite 3.1, JPA 2.0, JSP 2.2, EL 1.2, JSTL 1.2, JSF 2.0, JTA 1.1, JSR-45, JSR-250. But to my knowledge, nothing allows to say that these APIs won't be distributed separately (in java.net repository or somewhere else). For example (ok, it may a particular case), the JSF 2.0 API is available separately (in the java.net repository): <pre class="lang-xml prettyprint-override"><code><dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-api</artifactId> <version>2.0.0-b10</version> <scope>provided</scope> </dependency> </code></pre> And actually, you could get <code>javax.servlet-3.0.jar</code> from <a href="http://download.java.net/maven/glassfish/org/glassfish/javax.servlet/3.0" rel="noreferrer">there</a> and install it in your own repository.

1,538,523

How to get an ASP.NET MVC Ajax response to redirect to new page instead of inserting view into UpdateTargetId?

I am using the Ajax.BeginForm to create a form the will do an ajax postback to a certain controller action and then if the action is successful, the user should get redirected to another page (if the action fails then a status message gets displayed using the AjaxOptions UpdateTargetId). <pre><code>using (Ajax.BeginForm("Delete", null, new { userId = Model.UserId }, new AjaxOptions { UpdateTargetId = "UserForm", LoadingElementId = "DeletingDiv" }, new { name = "DeleteForm", id = "DeleteForm" })) { [HTML DELETE BUTTON] } </code></pre> If the delete is successful I am returning a Redirect result: <pre><code>[Authorize] public ActionResult Delete(Int32 UserId) { UserRepository.DeleteUser(UserId); return Redirect(Url.Action("Index", "Home")); } </code></pre> But the Home Controller Index view is getting loaded into the UpdateTargetId and therefore I end up with a page within a page. Two things I am thinking about: <ol> <li>Either I am architecting this wrong and should handle this type of action differently (not using ajax).</li> <li>Instead of returning a Redirect result, return a view which has javascript in it that does the redirect on the client side.</li> </ol> Does anyone have comments on #1? Or if #2 is a good solution, what would the "redirect javascript view" look like?

7,070,055

15

0

null

2009-10-08 15:23:09 UTC

30

2021-01-29 01:14:12.82 UTC

2019-04-26 11:53:45.633 UTC

null

9,020,340

null

21,579

null

1

93

c#|ajax|asp.net-mvc|asp.net-mvc-ajax

152,831

You can use <code>JavascriptResult</code> to achieve this. To redirect: <pre><code>return JavaScript("window.location = 'http://www.google.co.uk'"); </code></pre> To reload the current page: <pre><code>return JavaScript("location.reload(true)"); </code></pre> Seems the simplest option.

2,150,078

How to check visibility of software keyboard in Android?

I need to do a very simple thing - find out if the software keyboard is shown. Is this possible in Android?

4,737,265

45

12

null

2010-01-27 20:39:30.22 UTC

278

2022-01-09 20:50:06.89 UTC

2016-07-03 07:03:03.263 UTC

null

6,343,685

null

243,225

null

1

553

android|visibility|android-softkeyboard

299,942

NEW ANSWER added Jan 25th 2012 Since writing the below answer, someone clued me in to the existence of <a href="http://developer.android.com/reference/android/view/ViewTreeObserver.html" rel="noreferrer">ViewTreeObserver</a> and friends, APIs which have been lurking in the SDK since version 1. Rather than requiring a custom Layout type, a much simpler solution is to give your activity's root view a known ID, say <code>@+id/activityRoot</code>, hook a GlobalLayoutListener into the ViewTreeObserver, and from there calculate the size diff between your activity's view root and the window size: <pre><code>final View activityRootView = findViewById(R.id.activityRoot); activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight(); if (heightDiff > dpToPx(this, 200)) { // if more than 200 dp, it's probably a keyboard... // ... do something here } } }); </code></pre> Using a utility such as: <pre><code>public static float dpToPx(Context context, float valueInDp) { DisplayMetrics metrics = context.getResources().getDisplayMetrics(); return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueInDp, metrics); } </code></pre> Easy! Note: Your application must set this flag in Android Manifest <code>android:windowSoftInputMode="adjustResize"</code> otherwise above solution will not work. ORIGINAL ANSWER Yes it's possible, but it's far harder than it ought to be. If I need to care about when the keyboard appears and disappears (which is quite often) then what I do is customize my top-level layout class into one which overrides <code>onMeasure()</code>. The basic logic is that if the layout finds itself filling significantly less than the total area of the window, then a soft keyboard is probably showing. <pre><code>import android.app.Activity; import android.content.Context; import android.graphics.Rect; import android.util.AttributeSet; import android.widget.LinearLayout; /* * LinearLayoutThatDetectsSoftKeyboard - a variant of LinearLayout that can detect when * the soft keyboard is shown and hidden (something Android can't tell you, weirdly). */ public class LinearLayoutThatDetectsSoftKeyboard extends LinearLayout { public LinearLayoutThatDetectsSoftKeyboard(Context context, AttributeSet attrs) { super(context, attrs); } public interface Listener { public void onSoftKeyboardShown(boolean isShowing); } private Listener listener; public void setListener(Listener listener) { this.listener = listener; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int height = MeasureSpec.getSize(heightMeasureSpec); Activity activity = (Activity)getContext(); Rect rect = new Rect(); activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect); int statusBarHeight = rect.top; int screenHeight = activity.getWindowManager().getDefaultDisplay().getHeight(); int diff = (screenHeight - statusBarHeight) - height; if (listener != null) { listener.onSoftKeyboardShown(diff>128); // assume all soft keyboards are at least 128 pixels high } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } } </code></pre> Then in your Activity class... <pre><code>public class MyActivity extends Activity implements LinearLayoutThatDetectsSoftKeyboard.Listener { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ... LinearLayoutThatDetectsSoftKeyboard mainLayout = (LinearLayoutThatDetectsSoftKeyboard)findViewById(R.id.main); mainLayout.setListener(this); ... } @Override public void onSoftKeyboardShown(boolean isShowing) { // do whatever you need to do here } ... } </code></pre>

33,701,823

Chrome Mobile color bar theme-color meta tag not working

I'm trying to implement the <code>theme-color</code> meta tag but I can't see it working in my Motorola smartphone with Chrome and Android Lollipop. I started with a <code>theme-color</code> tag then I wrote the other tags, but have had no success at all. <pre><code><meta name="theme-color" content="#5f5eaa"> <meta name="msapplication-TileColor" content="#5f5eaa"> <meta name="msapplication-navbutton-color" content="#5f5eaa"> <meta name="apple-mobile-web-app-status-bar-style" content="#5f5eaa"> </code></pre> This webpage is running over HTTPS with an invalid certificate (it's an intranet tool), but I don't think it would affect that feature, right?

52,778,270

6

5

null

2015-11-13 21:11:46.927 UTC

3

2022-03-09 14:38:50.02 UTC

2018-11-09 18:14:12.49 UTC

null

397,817

null

3,489,993

null

1

31

html|google-chrome

23,131

<h2>Always check actual browsers versions.</h2> Here is table of supporting this meta tag. <a href="https://caniuse.com/#feat=meta-theme-color" rel="nofollow noreferrer">https://caniuse.com/#feat=meta-theme-color</a> <a href="https://i.stack.imgur.com/UFHZo.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UFHZo.jpg" alt="enter image description here" /></a>

8,923,174

OpenGL VAO best practices

Im facing an issue which I believe to be VAO-dependant, but Im not sure.. I am not sure about the correct usage of a VAO, what I used to do during GL initialization was a simple <pre><code>glGenVertexArrays(1,&vao) </code></pre> followed by a <pre><code>glBindVertexArray(vao) </code></pre> and later, in my drawing pipeline, I just called glBindBuffer(), glVertexAttribPointer(), glEnableVertexAttribArray() and so on.. without caring about the initally bound VAO is this a correct practice?

8,923,298

4

2

null

2012-01-19 08:42:55.417 UTC

45

2014-10-24 12:28:36.633 UTC

2014-07-21 21:07:15.27 UTC

null

1,642,975

null

815,129

null

1

83

opengl|opengl-3|vao

46,676

VAOs act similarly to VBOs and textures with regard to how they are bound. Having a single VAO bound for the entire length of your program will yield no performance benefits because you might as well just be rendering without VAOs at all. In fact it may be slower depending on how the implementation intercepts vertex attribute settings as they're being drawn. The point of a VAO is to run all the methods necessary to draw an object once during initialization and cut out all the extra method call overhead during the main loop. The point is to have multiple VAOs and switch between them when drawing. In terms of best practice, here's how you should organize your code: <pre><code>initialization: for each batch generate, store, and bind a VAO bind all the buffers needed for a draw call unbind the VAO main loop/whenever you render: for each batch bind VAO glDrawArrays(...); or glDrawElements(...); etc. unbind VAO </code></pre> This avoids the mess of binding/unbinding buffers and passing all the settings for each vertex attribute and replaces it with just a single method call, binding a VAO.

18,192,114

How to use vertical align in bootstrap

Simple problem: How do I vertically align a col within a col using bootstrap? Example here (I want to vertically align child1a and child1b): <a href="http://bootply.com/73666">http://bootply.com/73666</a> HTML <pre><code><div class="col-lg-12"> <div class="col-lg-6 col-md-6 col-12 child1"> <div class="col-12 child1a">Child content 1a</div> <div class="col-12 child1b">Child content 1b</div> </div> <div class="col-lg-6 col-md-6 col-12 child2"> Child content 2 Child content 2 Child content 2 Child content 2 Child content 2 </div> </div> </code></pre> UPDATE Some CSS: <pre><code>.col-lg-12{ top:40px; bottom:0px; border:4px solid green; } .child1a, .child1b{ border:4px solid black; display:inline-block !important; } .child1{ border:4px solid blue; height:300px; display:table-cell !important; vertical-align:middle; } .child2{ border:4px solid red; } </code></pre>

19,154,569

8

1

null

2013-08-12 16:31:41.033 UTC

18

2017-05-10 13:24:47.017 UTC

2013-08-12 17:32:08.94 UTC

null

2,274,357

null

2,429,989

null

1

51

css|twitter-bootstrap|twitter-bootstrap-3

240,324

<pre><code>.parent { display: table; table-layout: fixed; } .child { display:table-cell; vertical-align:middle; text-align:center; } </code></pre> <code>table-layout: fixed</code> prevents breaking the functionality of the col-* classes.

17,902,483

Show values from a MySQL database table inside a HTML table on a webpage

I want to retrieve the values from a database table and show them in a html table in a page. I already searched for this but I couldn't find the answer, although this surely is something easy (this should be the basics of databases lol). I guess the terms I've searched are misleading. The database table name is tickets, it has 6 fields right now (submission_id, formID, IP, name, email and message) but should have another field called ticket_number. How can I get it to show all the values from the db in a html table like this: <pre><code><table border="1"> <tr> <th>Submission ID</th> <th>Form ID</th> <th>IP</th> <th>Name</th> <th>E-mail</th> <th>Message</th> </tr> <tr> <td>123456789</td> <td>12345</td> <td>123.555.789</td> <td>John Johnny</td> <td>johnny@example.com</td> <td>This is the message John sent you</td> </tr> </table> </code></pre> And then all the other values below 'john'.

17,902,527

9

4

null

2013-07-27 21:08:40.19 UTC

49

2022-01-14 15:13:51.313 UTC

2018-04-24 17:47:56.683 UTC

null

4,370,109

null

2,601,086

null

1

52

php|mysql|database|html-table

651,800

Example taken from W3Schools: <a href="http://www.w3schools.com/php/php_mysql_select.asp" rel="noreferrer">PHP Select Data from MySQL</a> <pre><code><?php $con=mysqli_connect("example.com","peter","abc123","my_db"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); } $result = mysqli_query($con,"SELECT * FROM Persons"); echo "<table border='1'> <tr> <th>Firstname</th> <th>Lastname</th> </tr>"; while($row = mysqli_fetch_array($result)) { echo "<tr>"; echo "<td>" . $row['FirstName'] . "</td>"; echo "<td>" . $row['LastName'] . "</td>"; echo "</tr>"; } echo "</table>"; mysqli_close($con); ?> </code></pre> It's a good place to learn from!

18,103,769

How can I obtain the cube root in C++?

I know how to obtain the square root of a number using the <code>sqrt</code> function. How can I obtain the cube root of a number?

18,103,837

9

15

null

2013-08-07 12:46:23.243 UTC

6

2022-05-08 21:27:39.367 UTC

2013-08-07 13:52:02.65 UTC

null

560,648

null

2,654,303

null

1

33

c++

69,628

<code>sqrt</code> stands for "square root", and "square root" means raising to the power of <code>1/2</code>. There is no such thing as "square root with root 2", or "square root with root 3". For <a href="http://en.wikipedia.org/wiki/Nth_root" rel="noreferrer">other roots</a>, you change the first word; in your case, you are seeking how to perform cube rooting. Before C++11, there is no specific function for this, but you can go back to first principles: <ul> <li>Square root: <code>std::pow(n, 1/2.)</code> (or <a href="http://en.cppreference.com/w/cpp/numeric/math/sqrt" rel="noreferrer"><code>std::sqrt(n)</code></a>)</li> <li>Cube root: <code>std::pow(n, 1/3.)</code> (or <a href="http://en.cppreference.com/w/cpp/numeric/math/cbrt" rel="noreferrer"><code>std::cbrt(n)</code></a> since C++11)</li> <li>Fourth root: <code>std::pow(n, 1/4.)</code></li> <li>etc.</li> </ul> <hr> If you're expecting to pass negative values for <code>n</code>, avoid the <code>std::pow</code> solution — <a href="https://stackoverflow.com/a/4269119/560648">it doesn't support negative inputs with fractional exponents</a>, and this is why <code>std::cbrt</code> was added: <pre><code>std::cout << std::pow(-8, 1/3.) << '\n'; // Output: -nan std::cout << std::cbrt(-8) << '\n'; // Output: -2 </code></pre> <hr> N.B. That <code>.</code> is really important, because otherwise <code>1/3</code> uses integer division and results in <code>0</code>.

6,557,794

How to access value of map with a key if key was not found in scala?

Assume I have <pre><code>var mp = Map[String,String]() ..... val n = mp("kk") </code></pre> The above will throw runtime error in case key "kk" did not exist. I expected n will be null in case key did not exist. I want n to be null if key did not exist. What is the proper way to handle this situation in scala with a short code sample?

6,557,829

3

1

null

2011-07-02 15:13:31.717 UTC

4

2018-05-15 18:13:32.907 UTC

null

821,764

null

1

25

scala

43,231

First of all, you probably don't really want null, as that's almost always a sign of bad coding in Scala. What you want is for n to be of type Option[String], which says that the value is either a String or is missing. The right way to do that is with the .get() method on you map <pre><code>val n = mp.get("kk") </code></pre> If you really do need null (for interop with Java libraries, for example), you can use .getOrElse() <pre><code>val n = mp.getOrElse("kk", null) </code></pre>

6,403,737

Fixed Button below a scrollable ListView

I have a scrollable ListView with items (like in <a href="http://developer.android.com/resources/tutorials/views/hello-listview.html">http://developer.android.com/resources/tutorials/views/hello-listview.html</a>). I am using an <code>ArrayAdapter</code> for the items and use it as a parameter in <code>setListAdapter</code>. Now I would like to add a button at the bottom of the screen, which does not scroll with the list. Could someone give me some hints or post a code snippet how it could possibly be done?

6,404,148

3

0

null

2011-06-19 16:48:33.86 UTC

11

2017-01-17 00:21:46.807 UTC

null

603,841

null

1

30

android|listview

34,356

If your activity extends ListActivity then you need something like this: <pre><code><LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ListView android:id="@android:id/list" android:layout_height="0dip" android:layout_width="match_parent" android:layout_weight="1" /> <Button android:id="@+id/btn" android:layout_width="match_parent" android:layout_height="wrap_content"/> </LinearLayout> </code></pre> Notice that the listview has a layout_weight set to 1. That will keep the button fixed in its place at the bottom. Hope that helps. Good luck!

6,585,373

Django multiple and dynamic databases

I've been evaluating django and wondered if the following is possible. I've already looked at the regular multiple database docs so please don't point me to that because this use case isn't mentioned as far as i can make out. If i'm wrong i take it back :) I want one main database in which most of my app's models will reside, however one of the app's will need to dynamically create databases, these will be customer specific databases. The database path (i plan to use sqlite) will be stored in primary database and so the cursor would need to be changed but the model will remain the same. I would welcome any thoughts on ways to achieve this?

11,292,526

3

null

2011-07-05 15:41:59.16 UTC

28

2022-01-30 07:10:18.43 UTC

null

148,508

null

1

44

django|django-database

19,360

I will open with "<a href="https://docs.djangoproject.com/en/dev/topics/settings/#altering-settings-at-runtime" rel="noreferrer">You should not edit settings at runtime</a>". Having said that, I have exactly this same issue, where I want to create a unique database for each user. The reason for doing this is I am offering the ability for the user to save/access to/from a database not stored on my server, which entails having multiple databases, and thus one for each user. This answer is NOT the recommended way to achieve the desired goal. I would love to hear from a django-guru how to best approach this problem. However, this is a solution I have been using and it has worked well so far. I am using sqlite however it can be easily modified for any of the databases. In summary, this is the process: <ol> <li>Add the new database to settings (at runtime)</li> <li>Create a file to store these settings for reloading when the server is restarted (at runtime)</li> <li>Run a script which loads the saved settings files (whenever the server is restarted)</li> </ol> Now, how to achieve this: 1) Firstly, when a new user is created, I create a new database in the settings. This code lives in my view where new users are created. <pre><code>from YOUR_PROJECT_NAME import settings database_id = user.username #just something unique newDatabase = {} newDatabase["id"] = database_id newDatabase['ENGINE'] = 'django.db.backends.sqlite3' newDatabase['NAME'] = '/path/to/db_%s.sql' % database_id newDatabase['USER'] = '' newDatabase['PASSWORD'] = '' newDatabase['HOST'] = '' newDatabase['PORT'] = '' settings.DATABASES[database_id] = newDatabase save_db_settings_to_file(newDatabase) #this is for step 2) </code></pre> This script loads the database settings 'at runtime' into the django project settings. However if the server is restarted, this database will no longer be in settings. 2) To facilitate reloading these settings automatically whenever the server is restarted, I create a file for each database which will be loaded whenever the server is started. Creating this file is performed by the function <code>save_db_settings_to_file</code>: <pre><code>def save_db_settings_to_file(db_settings): path_to_store_settings = "/path/to/your/project/YOUR_PROJECT_NAME/database_settings/" newDbString = """ DATABASES['%(id)s'] = { 'ENGINE': '%(ENGINE)s', # Add 'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'. 'NAME': '%(NAME)s', # Or path to database file if using sqlite3. 'USER': '', # Not used with sqlite3. 'PASSWORD': '', # Not used with sqlite3. 'HOST': '', # Set to empty string for localhost. Not used with sqlite3. 'PORT': '', # Set to empty string for default. Not used with sqlite3. } """ % db_settings file_to_store_settings = os.path.join(path_to_store_settings, db_settings['id'] + ".py") write_file(file_to_store_settings, newDbString) #psuedocode for compactness </code></pre> 3) To actually load these settings when the server is started, I add a single line to the very bottom of <code>/path/to/your/project/YOUR_PROJECT_NAME/settings.py</code>, which loads each file in the settings folder and runs it, having the effect of loading the database details into the settings. <pre><code>import settings_manager </code></pre> Then, <code>import settings_manager</code> will load the file at <code>/path/to/your/project/YOUR_PROJECT_NAME/settings_manager.py</code>, which contains the following code: <pre><code>from settings import DATABASES import os path_to_store_settings = "/path/to/your/project/YOUR_PROJECT_NAME/database_settings/" for fname in os.listdir(path_to_settings): full_path = os.path.join(path_to_settings, fname) f = open(full_path) content = f.read() f.close() exec(content) #you'd better be sure that the file doesn't contain anything malicious </code></pre> Note that you could put this code directly at the bottom of settings.py instead of the import statement, but using the import statement keeps the abstraction level of settings.py consistent. This is a convenient way to load each database setting because to remove a database from the settings all you have to do is delete the settings file, and the next time the server restarts it won't load those details into the settings, and the database will not be accessible. As I said, this works and I have had success using it so far, but this is NOT the ideal solution. I would really appreciate if someone could post a better solution. What's bad about it: <ul> <li>It explicitly defies advice from django team not to modify settings at runtime. I do not know the reason for why this advice is given.</li> <li>It uses an <code>exec</code> statement to load the data into settings. This should be OK, but if you get some corrupt or malicious code in one of those files you will be a sad panda.</li> </ul> Note that I still use the default database for auth and sessions data, but all the data from my own apps is stored in the user-specific database.

6,587,712

django url patterns with 2 parameters

This is simple and obvious but I can't get it right: I have the following view function declared in urls.py <pre><code> (r'^v1/(\d+)$', r'custom1.views.v1'), </code></pre> originally I was passing a single parameter to the view function v1. I want to modify it to pass 2 parameters. How do I declare the entry in urls.py to take two parameters?

6,587,781

4

0

null

2011-07-05 19:17:08.323 UTC

1

2020-05-07 18:29:53.907 UTC

null

773,389

null

1

16

django

42,389

I believe each group in the regex is passed as a parameter (and you can name them if you want): <pre><code>(r'^v1/(\d+)/(\d+)/$', r'custom1.views.v1') </code></pre> Check out the examples at: <a href="https://docs.djangoproject.com/en/dev/topics/http/urls/" rel="noreferrer">https://docs.djangoproject.com/en/dev/topics/http/urls/</a>. You can also name your groups.

36,212,901

VS 2015 Razor Autocomplete/Intellisense dropdown hides immediately after dropdown

In VS 2015, only when in Razor (.cshtml) files, roughly half of the time the autocomplete/suggestion list/intellisense doesn't work correctly (sorry, not sure the actual term... when you type an object and hit <code>.</code> and the list of properties and methods shows to select from) The behavior is that when I hit <code>.</code>, the list popups up for a fraction of a second and then closes. It happens so fast I try to do a quick <code>Backspace</code>, <code>.</code>, <code>Backspace</code>, <code>.</code> cycle a few times to at least see the name I need, but I usually cant' get it and end up having to find the exact name elsewhere from code. Extremely irritating... It happens sporadically with no real pattern I can find. Here's patterns that I've ruled out: <ul> <li>The file that's open doesn't seem to matter.</li> <li>Whether or not I close/reopen the file doesn't seem to matter</li> <li>Whether I navigate to another file and back doesn't seem to matter</li> <li>It will work/not work multiple times on and off throughout the same file</li> <li>It doesn't seem to be relevant to any particular object/property/method</li> </ul> I've checked all my options (there doesn't seem to be Text Editing options for Razor?), have tried clearing caches, the reloading solution/projects, restarting VS, all of which seem to still provide no pattern. Has anyone come across this and have any ideas of where else I can look to fix it? Example Here's an extremely simple example... new project, very little code/files, very simple view. Where the <code>Model.</code> stops, I should have the usual base methods, and an 'Items' collection. It pops up for a split second then disappears... no lambdas/complex view parsing involved (this is reproducible as well): <a href="https://i.stack.imgur.com/3k23t.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/3k23t.jpg" alt="enter image description here"></a> Update: Patterns Things I've noticed: <ul> <li>If I'm entering a <code>@model ns.ns.ns.type</code>, it rarely happens toward the "base" end of the namespaces. It's as I get further towards the type that it happens. This one is intermittent.</li> <li>In some cases, it works perfectly fine, every single time. For example, I often use DevExpress tools, and have never seen the behavior on any of their extensions (so, <code>@Html.DevExpress().</code> (and other similar, not necessarily DevEx models) will never cause a problem)</li> <li>It happens almost all the time when I'm accessing my <code>@Model</code> (which is where I most want it!). I've found some cases where this is reproducible every time (see above example), but it's about 90%+</li> <li>Occasionally, as I work through the object tree, one will fail while the next works (ex: <code>@models ProjName.Web.App.Subscriptions.Models.AccountCreateVM</code>... it might fail on <code>Subscriptions</code> but work fine on <code>Models</code>)</li> <li>Occasionally, beginning to type the name within autocomplete kicks it back into gear and it starts working again. In the above example, starting to type <code>Acc</code> for <code>AccountCreateVM</code> causes it to start working again.</li> </ul>

38,750,315

8

3

null

2016-03-25 01:55:21.01 UTC

12

2017-08-24 09:22:22.917 UTC

2016-07-22 19:12:54.29 UTC

null

4,155,665

null

4,155,665

null

1

43

razor|visual-studio-2015|intellisense

4,457

I haven't found the root cause, but in all cases, <code>CTRL+SPACE</code> works. This isn't the best, but light years better than nothing at all. (this shortcut is not one I've used in the past, so this is likely standard behavior, but...) If you're at the dot <code>Model.</code> and autocomplete list disappears, CTRL+SPACE consistently brings it back up, and when it does come back, it stays! If there's only one possible autocomplete member, it'll auto-fill the member for you upon CTRL+SPACE

18,727,186

How to load classes based on pretty URLs in MVC-like page?

I would like to ask for some tips, on how solve this problem. I'm trying to build my own MVC website. I learned the basics of the URL. <pre><code>http://example.com/blog/cosplay/cosplayer-expo-today </code></pre> blog -> the controller cosplay -> the method in controller cosplayer-expo-today ->variable in method What if i dynamically extend the category in my blog controller? Will I need to create the method, or is there some trick to do that automatically? I mean... i have these categories now: cosplay,game,movie,series. So I need to create these methods in controller, but they all do the same thing, namely select other category from database. <ul> <li>function cosplay() = example.com/blog/cosplay/</li> <li>function game() = example.com/blog/game/</li> <li>function movie() = example.com/blog/movie/</li> <li>function series() = example.com/blog/series/</li> </ul> Is there any good advice on how can i write my controller to do that automatically? I mean if I upload a new category in my database, but i don't want to modify the controller. Is it possible? Thanks for the help! UPDATE Here is my URL exploder class <pre><code>class Autoload { var $url; var $controller; function __construct() { $this->url = $_GET['url']; //HNEM ÜRES AZ URL if($this->url!='' && !empty($this->url)) { require 'application/config/routes.php'; //URL VIZSGÁLATA $this->rewrite_url($this->url); //URL SZÉTBONTÁSA $this->url = explode('/', $this->url); $file = 'application/controllers/'.$this->url[0].'.php'; //LÉTEZIK A CONTROLLER? if(file_exists($file)) { require $file; $this->controller = new $this->url[0]; //KÉRELEM ALATT VAN AZ ALOLDAL? if(isset($this->url[1])) { //LÉTEZIK A METÓDUS? ENGEDÉLYEZVE VAN? if(method_exists($this->controller, $this->url[1]) && in_array($this->url[1], $route[$this->url[0]])) { if(isset($this->url[2])) { $this->controller->{$this->url[1]}($this->url[2]); } else { $this->controller->{$this->url[1]}(); } } else { header('location:'.SITE.$this->url[0]); die(); } } } else { header('location:'.SITE); die(); } } else { header('location:'.SITE.'blog'); die(); } } /** * Első lépésben megvizsgáljuk, hogy a kapott szöveg tartalmaz-e nagybetűt. Amennyiben igen átalakítjuk kisbetűsre. * Második lépésben megnézzük, hogy a kapott szöveg '/'-re végződik-e. Amennyiben igen levágjuk azt. * Harmadik lépésben újra töltjük az oldalt a formázott szöveggel. * * @param string $url Korábban beolvasott URL. */ private function rewrite_url($url) { //HA NAGYBETŰ VAN AZ URL-BEN VAGY '/'-RE VÉGZŐDIK if(preg_match('/[A-Z]/', $url) || substr($url, -1)=='/') { //NAGYBETŰS AZ URL KICSIRE ALAKÍTJUK if(preg_match('/[A-Z]/', $url)) { $url = strtolower($url); } //HA '/'-RE VÉGZŐDIK LEVÁGJUK if(substr($url, -1)=='/') { $url = substr($url, 0, strlen($url)-1); } header('location:'.SITE.$url); die(); } } } </code></pre> And here is my .htacces <pre><code>Options +FollowSymLinks RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-l RewriteRule ^(.+)$ index.php?url=$1 [QSA,L] </code></pre>

19,309,893

2

5

null

2013-09-10 19:21:36.42 UTC

18

2017-11-30 16:57:05.39 UTC

2013-12-06 11:44:04.363 UTC

null

727,208

user2432700

null

1

6

php|.htaccess|url-routing

6,239

<blockquote> FYI: There are several things that you are doing wrong. I will try to go through each of them and explain the problems, the misconceptions and the possible solution(s). </blockquote> <h2>The autoloading and routing are separate things.</h2> From the look of you posted code, it's obvious, that you have a single class, which is responsible the following tasks: <ul> <li>routing: it splits the URL in parts that have some significance for the rest of applications</li> <li>autoloading: class takes the separated URL segments and attempts to include related code</li> <li>factory: new instances are initialized and some method are called on them</li> <li>response: in some cases, the class sends a response to user in form of HTTP header</li> </ul> In OOP there is this thing, called: <a href="http://en.wikipedia.org/wiki/Single_responsibility_principle" rel="noreferrer">Single Responsibility Principle</a> [<a href="https://i.stack.imgur.com/myc48.jpg" rel="noreferrer">short version</a>]. Basically it means that a class should be handling one specific are thing. The list above constitutes at least 4 different responsibilities for your <code>Autoload</code> class. Instead of what you have now, each of these general tasks should be handled by a separate class. And in case of autoloader, you could get away with a single function. <h2>How to do write your own autoloading code ?</h2> Part of the problem that I see is the confusion about how autoload actually works in PHP. The call of <code>include</code> or <code>require</code> doesn't need to be done where the instance will be created. Instead you register a handler (using <a href="http://www.php.net/manual/en/function.spl-autoload-register.php" rel="noreferrer"><code>spl_autoload_register()</code></a> function), which then is **automatically* called, when you try to use previously-undefined class. The simplest example for it is: <pre><code>spl_autoload_register( function( $name ) use ( $path ) { $filename = $path . '/' . $name . '.php'; if ( file_exists( $filename ) === true ) { require $filename; return true; } return false; }); </code></pre> This particular example uses <a href="http://www.php.net/manual/en/functions.anonymous.php" rel="noreferrer">anonymous function</a>, which is one of features that was introduced in PHP 5.3, but the manual page for the <code>spl_autoload_register()</code> will also show you examples how to achieve the same with objects or ordinary functions. Another new feature that is closely related to autoloading is <a href="http://www.php.net/manual/en/language.namespaces.php" rel="noreferrer">namespaces</a>. In this context the namespaces would give you two immediate benefits: ability to have multiple classes with same name and options to load class file from multiple directories. For example, you can have code like this: <pre><code>$controller = new \Controllers\Overview; $view = new \Views\Overview; $controller->doSomething( $request ); </code></pre> .. in this case you can have autoloader fetching classes from <code>/project/controllers/overview.php</code> and <code>/project/views/overview.php</code> files respectively. Because the <code>spl_autoload_register()</code> will pass <code>"\Controllers\Overview"</code> and <code>"\Views\Overview"</code> to the handler function. There is also a <a href="http://www.php-fig.org/" rel="noreferrer">FIG</a> recommendation for how to implement autoloaders. You can find it <a href="https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md" rel="noreferrer">here</a>. While it has some significant problems, it should provide you with good base on which to build upon. <h2>How to parse pretty URLs ?</h2> It is no secret, that Apache's mod_rewrite is quite limited in what it can do with pretty URLs. And, while it's a widespread server, it is not the only option for webservers. This is why for maximum flexibility PHP developers opt to handle URLs on the PHP end. And the first thing any newbie will do is <code>explode('/', ... )</code>. It is a natural choice, but you will soon notice that it is also extremely limited in what it can really do. The routing mechanism will start to grow. At first based on count of segments, later - adding different conditional values in segments, that require different behavior. Essentially, this will turn in huge, fragile and uncontrollable mess. Bad idea. Instead what you should do is have a list of regular expressions, that you match against given pretty URL. For example: <pre><code>'#/(?P<resource>[^/\\\\.,;?\n]+)/foobar#' </code></pre> The above defined pattern would match all the URL that have two segments, with some text in first segment and <code>"foobar"</code> in the second ... like <code>"/testme/foobar"</code>. Additionally you can link each pattern with corresponding default values for each match. When you put this all together, you might end up with configuration like this (uses 5.4+ array syntax, because that's how I like to write .. deal with it): <pre><code>$routes = [ 'primary' => [ 'pattern' => '#/(?P<resource>[^/\\\\.,;?\n]+)/foobar#', 'default' => [ 'action' => 'standard', ], ], 'secundary' => [ 'pattern' => '#^/(?P<id>[0-9]+)(?:/(?P<resource>[^/\\\\.,;?\n]+)(?:/(?P<action>[^/\\\\.,;?\n]+))?)?$#', 'default' => [ 'resource' => 'catalog', 'action' => 'view', ] ], 'fallback' => [ 'pattern' => '#^.*$#', 'default' => [ 'resource' => 'main', 'action' => 'landing', ], ], ]; </code></pre> Which you could handle using following code: <pre><code>// CHANGE THIS $url = '/12345/product'; $current = null; // matching the route foreach ($routes as $name => $route) { $matches = []; if ( preg_match( $route['pattern'], $url, $matches ) ) { $current = $name; $matches = $matches + $route['default']; break; } } // cleaning up results foreach ( array_keys($matches) as $key ) { if ( is_numeric($key) ) { unset( $matches[$key] ); } } // view results var_dump( $current, $matches ); </code></pre> <kbd>Live code: <a href="http://3v4l.org/T7i3l" rel="noreferrer">here</a> or <a href="http://codepad.viper-7.com/VOCWZh" rel="noreferrer">here</a></kbd> <blockquote> Note: If you use <code>'(?P<name> .... )'</code> notation, the matches will return array with <code>'name'</code> as a key. Useful trick for more then routing. </blockquote> You probably will want to generate the regular expressions for the matching from some more-readable notations. For example, in configuration file, this expression: <pre><code>'#^/(?P<id>[0-9]+)(?:/(?P<resource>[^/\\\\.,;?\n]+)(?:/(?P<action>[^/\\\\.,;?\n]+))?)?$#' </code></pre> .. should probably look something like <pre><code>'/:id[[/:resource]/:action]' </code></pre> Where the <code>:param</code> would indication an URL segment and <code>[...]</code> would signify an optional part of URL. Based on this you should be able to flesh out your own routing system. The code fragments above is just example of simplified core functionality. To get some perspective on how it might look when fully implemented, you could look at code in <a href="https://stackoverflow.com/a/18416136/727208">this answer</a>. It should give you some ideas for your own API version. <h2>Calling the stuff on controllers ..</h2> It is quite common mistake to bury the execution of controllers somewhere deep in the routing class (or classes).This causes two problems: <ul> <li>confusion: it makes harder to find where the "real work" begins in the application</li> <li>coupling: your router ends up chained to that specific interpretation of MVC-like architecture</li> </ul> Routing is a task which even in custom-written application will naturally gravitate toward the "framework-ish" part of codebase. The (really) simplified versions would look like: <pre><code>$matches = $router->parse( $url ); $controller = new {'\\Controller\\'.$matches['controller']}; $controller->{$matches['action']( $matches ); </code></pre> This way there is nothing that requires your routing results to be used in some MVC-like architecture. Maybe you just need a glorified fetching mechanism for serving static HTML files. <h2>What about those dynamically extend categories?</h2> You are looking at it the wrong way. There is no need for dynamically adding methods to controller. In your example there is actually one controller method ... something along the lines of: <pre><code>public function getCategory( $request ) { $category = $request->getParameter('category'); // ... rest of your controller method's code } </code></pre> Where <code>$category</code> would end up containing <code>"cosplay"</code>, <code>"game"</code>, <code>"movie"</code>, <code>"series"</code> or any other category that you have added. It is something that your controller would pass to the model layer, to filter out articles. <h2>What people actually use professionally?</h2> These days, since everyone (well .. everyone with some clue) uses <a href="https://getcomposer.org" rel="noreferrer">composer</a>, for autoloading the best option is to use the loader that is comes bundled with composer. You simply add <code>require __DIR__ . '/vendor/autoload.php'</code> and with some configuration it will just work. As for routing, there are two major "standalone" solutions: <a href="https://github.com/nikic/FastRoute" rel="noreferrer">FastRoute</a> or <a href="http://symfony.com/doc/current/components/routing.html" rel="noreferrer">Symfony's Routing Component</a>. These ones can be included in you project without additional headaches. But since some of people will be using frameworks, each of those will also contain capability of routing the requests. <h2>Some further reading ..</h2> If you want to learn more about MVC architectural pattern, I would strongly recommend for you to go though all the materials listed in <a href="https://stackoverflow.com/a/16356866/727208">this post</a>. Think of it as mandatory reading/watching list. You also might find somewhat beneficial these old posts of mine on the MVC related subjects: <a href="https://stackoverflow.com/a/5864000/727208">here</a>, <a href="https://stackoverflow.com/a/16596704/727208">here</a> and <a href="https://stackoverflow.com/a/13396866/727208">here</a> <blockquote> P.S.: since PHP 5.0 was released (some time in 2004th), class's variables should be defined using <code>public</code>, <code>private</code> or <code>protected</code> instead of <code>var</code>. </blockquote>

27,507,678

In angular $http service, How can I catch the "status" of error?

I'm reading a book called, "Pro Angular JS". However, I have a question about how to catch a status of error. What I coded is : <pre><code>$http.get(dataUrl) .success(function (data){ $scope.data.products = data; }) .error(function (error){ $scope.data.error=error; console.log($scope.data.error.status); // Undefined! // (This is the spot that I don't get it.) }); </code></pre> If I code "console.log($scope.data.error.status);" , why does the argument of console.log is undefined? In the book, there are sentence, "The object passed to the error function defines status and message properties." So I did $scope.data.error.status Why is it wrong?

27,507,822

6

4

null

2014-12-16 15:08:53.29 UTC

11

2017-08-28 09:45:22.05 UTC

user8317956

null

3,868,638

null

1

48

javascript|angularjs

110,452

Your arguments are incorrect, error doesn't return an object containing status and message, it passed them as separate parameters in the order described below. Taken from the <a href="https://docs.angularjs.org/api/ng/service/$http">angular docs</a>: <ul> <li>data – {string|Object} – The response body transformed with the transform functions. </li> <li>status – {number} – HTTP status code of the response.</li> <li>headers – {function([headerName])} – Header getter function.</li> <li>config – {Object} – The configuration object that was used to generate the request. </li> <li>statusText – {string} – HTTP status text of the response.</li> </ul> So you'd need to change your code to: <pre><code>$http.get(dataUrl) .success(function (data){ $scope.data.products = data; }) .error(function (error, status){ $scope.data.error = { message: error, status: status}; console.log($scope.data.error.status); }); </code></pre> Obviously, you don't have to create an object representing the error, you could just create separate scope properties but the same principle applies.

5,027,403

Vim show strange Â characters over putty

When I am editing a file in Vim I have some lines with a bunch of Â displayed. I have already checked the encoding with <pre><code>:set encoding </code></pre> It says utf8 <pre><code>encoding=utf8 </code></pre> Anybody knows where this is comming from and how to stop this behaviour? Regards, Jeremy

5,027,543

2

1

null

2011-02-17 09:59:29.577 UTC

10

2011-02-18 00:13:08.107 UTC

null

231,982

null

1

27

vim|encoding|character|putty

19,230

Make sure that PuTTY is set for UTF-8 as well. You can do this under Window -> Translation -> Remote Character Set. You may need to choose a font that supports a reasonable portion of the Unicode range as well -- Terminal isn't necessarily going to cut it.

787,776

Find free disk space in python on OS/X

I'm looking for the number of free bytes on my HD, but have trouble doing so on python. I've tried the following: <pre><code>import os stat = os.statvfs(path) print stat.f_bsize * stat.f_bavail </code></pre> But, on OS/X it gives me a 17529020874752 bytes, which is about about 1.6 TB, which would be very nice, but unfortunately not really true. What's the best way to get to this figure?

787,832

7

1

null

2009-04-24 22:17:32.313 UTC

10

2015-07-19 10:57:34.693 UTC

2015-01-01 00:10:29.36 UTC

null

1,505,120

null

80,911

null

1

25

python|diskspace

33,614

Try using <code>f_frsize</code> instead of <code>f_bsize</code>. <pre><code>>>> s = os.statvfs('/') >>> (s.f_bavail * s.f_frsize) / 1024 23836592L >>> os.system('df -k /') Filesystem 1024-blocks Used Available Capacity Mounted on /dev/disk0s2 116884912 92792320 23836592 80% / </code></pre>

1,096,862

Print directly from browser without print popup window

As it said in the subject I've to create a feature for a web-based application that will allow users to send print directly without prompting any dialog boxe just make the print i.e click and print, simple! but not for me :(. Please, suggest what would be the best option and how should I write it up (technology). Suggest please! Thanks. EDIT: The print should be send on the user's default printer.

1,124,848

7

4

null

2009-07-08 08:40:55.717 UTC

12

2013-06-06 03:31:41.857 UTC

2009-07-22 05:26:22.173 UTC

null

134,743

null

134,743

null

1

25

browser|printing|activex|client-side

175,191

<blockquote> I couldn't find solution for other browsers. When I posted this question, IE was on the higher priority and gladly I found one for it. If you have a solution for other browsers (firefox, safari, opera) please do share here. Thanks. </blockquote> VBSCRIPT is much more convenient than creating an ActiveX on VB6 or C#/VB.NET: <pre><code><script language='VBScript'> Sub Print() OLECMDID_PRINT = 6 OLECMDEXECOPT_DONTPROMPTUSER = 2 OLECMDEXECOPT_PROMPTUSER = 1 call WB.ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER,1) End Sub document.write "<object ID='WB' WIDTH=0 HEIGHT=0 CLASSID='CLSID:8856F961-340A-11D0-A96B-00C04FD705A2'></object>" </script> </code></pre> Now, calling: <pre><code><a href="javascript:window.print();">Print</a> </code></pre> will send print without popup print window.

1,002,073

an array of strings as a jQuery selector?

I have an array of strings that are valid jQuery selectors (i.e. IDs of elements on the page): <pre><code>["#p1", "#p2", "#p3", "#p4", "#p5"] </code></pre> I want to select elements with those IDs into a jQuery array. This is probably elementary, but I can't find anything online. I could have a for-loop which creates a string <code>"#p1,#p2,#p3,#p4,#p5"</code> which could then be passed to jQuery as a single selector, but isn't there another way? Isn't there a way to pass an array of strings as a selector? EDIT: Actually, there is <a href="https://stackoverflow.com/questions/201724/easy-way-to-turn-javascript-array-into-comma-separated-list/201733">an answer out there already</a>.

1,002,099

7

0

null

2009-06-16 15:03:05.313 UTC

10

2022-08-27 15:52:58.257 UTC

2017-05-23 11:54:39.773 UTC

null

-1

null

65,232

null

1

34

javascript|jquery

33,466

Well, there's 'join': <pre><code>["#p1", "#p2", "#p3", "#p4", "#p5"].join(", ") </code></pre> EDIT - Extra info: It is possible to select an array of elements, problem is here you don't have the elements yet, just the selector strings. Any way you slice it you're gonna have to execute a search like .getElementById or use an actual jQuery select.

560,811

How To Use DateTimePicker In WPF?

I have no idea how to use the DateTimePicker control in WPF. It is not available in the Toolbox.

560,824

8

0

null

2009-02-18 12:14:24.377 UTC

6

2021-09-19 08:17:38.767 UTC

2012-05-10 13:55:35.917 UTC

John

72,882

Saransh

null

1

26

wpf|datetimepicker

113,085

Please Note: The following answer only applied to WPF under the 3.5 Framework as NET 4.0 runtime has it's own <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.datepicker.aspx" rel="nofollow noreferrer">datetime control</a>. By default WPF 3.5 does not come with a date time picker like winforms. However a date picker has been added in the <a href="http://www.codeplex.com/wpf/Release/ProjectReleases.aspx?ReleaseId=22567" rel="nofollow noreferrer">WPF tool kit</a> produced by Microsoft which can be <a href="http://www.codeplex.com/wpf/Release/ProjectReleases.aspx?ReleaseId=22567" rel="nofollow noreferrer">downloaded here</a>. I guess it will become part of the framework in a future release. It is simple to add a reference to the WPFToolkit.dll, see it in the tool box and distribute with your application by following the instructions on the website. Before this was available other people had created 3rd party pickers (which you may prefer) or alternatively used the less ideal solution of using the winforms control in a WPF application. Update: This so question is very similar <a href="https://stackoverflow.com/questions/534845/does-anyone-have-a-wpf-net-3-0-date-picker">this one</a> which also has a link to a <a href="http://windowsclient.net/wpf/wpf35/wpf-35sp1-toolkit-calendar-datepicker-walkthrough.aspx" rel="nofollow noreferrer">walk through for the datepicker</a> along with other links.

80,084

In Javascript, why is the "this" operator inconsistent?

In JavaScript, the "this" operator can refer to different things under different scenarios. Typically in a method within a JavaScript "object", it refers to the current object. But when used as a callback, it becomes a reference to the calling object. I have found that this causes problems in code, because if you use a method within a JavaScript "object" as a callback function you can't tell whether "this" refers to the current "object" or whether "this" refers to the calling object. Can someone clarify usage and best practices regarding how to get around this problem? <pre><code> function TestObject() { TestObject.prototype.firstMethod = function(){ this.callback(); YAHOO.util.Connect.asyncRequest(method, uri, callBack); } TestObject.prototype.callBack = function(o){ // do something with "this" //when method is called directly, "this" resolves to the current object //when invoked by the asyncRequest callback, "this" is not the current object //what design patterns can make this consistent? this.secondMethod(); } TestObject.prototype.secondMethod = function() { alert('test'); } } </code></pre>

80,127

8

1

null

2008-09-17 04:46:25.487 UTC

28

2018-11-15 19:30:14.077 UTC

2008-09-17 05:13:28.073 UTC

JasonBunting

1,790

Chris

null

1

30

javascript

11,707

In JavaScript, <code>this</code> always refers to the object invoking the function that is being executed. So if the function is being used as an event handler, <code>this</code> will refer to the node that fired the event. But if you have an object and call a function on it like: <pre><code>myObject.myFunction(); </code></pre> Then <code>this</code> inside <code>myFunction</code> will refer to <code>myObject</code>. Does it make sense? To get around it you need to use closures. You can change your code as follows: <pre><code>function TestObject() { TestObject.prototype.firstMethod = function(){ this.callback(); YAHOO.util.Connect.asyncRequest(method, uri, callBack); } var that = this; TestObject.prototype.callBack = function(o){ that.secondMethod(); } TestObject.prototype.secondMethod = function() { alert('test'); } } </code></pre>

535,056

How to get started with version control and PHP

I have absolutely no idea about version control. Only that it can be very useful in many ways. I have found a few related questions but none that start from the absolute beginning. I am the only developer at my work using Mac OS X and traditionally just been using FTP. Can anyone help me with version control in relation to PHP projects (does it matter)?

535,244

9

2

null

2009-02-11 01:21:04.037 UTC

14

2014-07-18 00:50:20.813 UTC

alex

31,671

alex

31,671

null

1

35

php|version-control

23,110

Yes, try it out, it's worth it. And the language you are using doesn't matter. It's working great with PHP for me and it will for you too. Benefits If you are the only developer, it is indeed easier to go without version control. However, you will find great benefits to using a version control system. Some of the easiest benefits will be: <ol> <li>Never wondering what is your latest version once you go back to a project (no more myproject090201-archive2-final6.zip)</li> <li>Never fear to start off some major refactoring, if you make a mistake on your file, you'll just rollback to the latest version</li> <li>If something stops working in your project and you have the feeling it worked at one point, you can test some of the prior versions easily and look at the difference between the working version and the non-working version to find what broke the code</li> <li>Additional backup of your current project, and even better if it's not on your machine... of course, additional points for backing up your version control system, we're never too cautious, you don't want to have to restart that month-long project do you?</li> </ol> Choices As some have said, you have a few choices for your version control system and I guess you'll want a free one to begin. There are a few excellent commercial products but the free ones have nothing to be ashamed of. So here are some very popular free version control systems: <ul> <li><a href="http://subversion.tigris.org/" rel="noreferrer">Subversion</a> (also called SVN)</li> <li><a href="http://git-scm.com/" rel="noreferrer">Git</a></li> <li><a href="http://www.selenic.com/mercurial/wiki/" rel="noreferrer">Mercurial</a></li> <li><a href="http://bazaar-vcs.org/" rel="noreferrer">Bazaar</a></li> </ul> Centralized versus distributed Subversion has been there for a while and it's one classified as 'centralized'. Meaning everyone will always go fetch the latest version and commit their latest work to one central system, often on another system although it can easily be on your own machine. It's a process easy to understand. The three others are called 'distributed'. There's a lot of different possible processes as it's a more flexible system and that's why those three newcomers are getting a lot of traction these days in open source projects where a lot of people are interacting with one another. Basically you are working with your own revisions on your own machine, making as many copies as you need and deciding which versions you share with other people on other computers. The trend definitely seems go towards distributed system but as those systems are more recent, they are still missing the GUI tools that makes it really user friendly to use and you might sometimes find the documentation to be a bit lighter. On the other hand, this all seems to be getting corrected quickly. In your case, as you are working alone, it probably won't make a big difference, and although you'll hear very good points for centralized and distributed systems, you'll be able to work with one or the other without any problems. Tools If you absolutely need a GUI tool for your Mac, I'd then choose SVN to get initiated to source control. There are two very good products for that (commercial): <ul> <li><a href="http://versionsapp.com/" rel="noreferrer">Versions</a></li> <li><a href="http://www.zennaware.com/cornerstone/" rel="noreferrer">Cornerstone</a></li> </ul> And a few <a href="http://osx.iusethis.com/tag/subversion" rel="noreferrer">other ones</a> (such as the free <a href="http://www.lachoseinteractive.net/en/community/subversion/svnx/features/" rel="noreferrer">svnX</a>) that are becoming a little bit old and unfriendly in my opinion but that might be interesting trying anyway. If you don't mind not using the GUI tools, with the help of Terminal you'll be able to do all the same things with a few simple command lines with any of the aforementioned systems. Starting points In any cases, you'll want some starting points. <ul> <li>For Subversion, your first stop must be their free book, <a href="http://svnbook.red-bean.com/" rel="noreferrer">Version Control with Subversion</a>. Take a few hours of your day to go through the chapters, it'll be time well invested. The introduction chapters are a good read even you don't want to use Subversion specifically because it'll get you to understand version control a little bit better.</li> <li>For a distributed system, I've had fun with Mercurial but it's an easily flammable subject so I'll let you make your own choice there. But if you end up looking at Mercurial, have a look at <a href="http://blog.medallia.com/2007/02/a_guided_tour_of_mercurial.html" rel="noreferrer">this blog post</a>, it was an excellent starter for me that'll get you up and running with the basics in a few minutes if you're already a bit accustomed to version control in general. Anyway, drop by <a href="http://www.selenic.com/mercurial/wiki/" rel="noreferrer">Mercurial's homepage</a> and have a look at the Getting Started section of the page.</li> </ul> Conclusion Give it a go, invest a day trying it out with a few bogus files. Try out renaming files and directory, erasing, moving things around, committing binary files versus text files, resolving conflicts and reverting to older versions to get a hang of it. These are often the first few hurdles you'll encounter when playing with version control and it'll be painless if it's on a non-production project. In any cases, it's something well-worth learning that'll be helpful with your solo projects as well as if you end up working with other developers at your current job or your next one. Good luck!

140,550

What is the best way to store a large amount of text in a SQL server table?

What is the best way to store a large amount of text in a table in SQL server? Is varchar(max) reliable?

140,558

9

0

null

2008-09-26 16:28:22.07 UTC

4

2022-09-22 16:17:53.997 UTC

2008-09-26 16:55:40.583 UTC

Rich B

5,640

Bruno

17,648

null

1

51

sql-server

109,583

In SQL 2005 and higher, VARCHAR(MAX) is indeed the preferred method. The TEXT type is still available, but primarily for backward compatibility with SQL 2000 and lower.

433,302

Convert a String to Variable

I've got a multidimensional associative array which includes an elements like <pre><code>$data["status"] $data["response"]["url"] $data["entry"]["0"]["text"] </code></pre> I've got a strings like: <pre><code>$string = 'data["status"]'; $string = 'data["response"]["url"]'; $string = 'data["entry"]["0"]["text"]'; </code></pre> How can I convert the strings into a variable to access the proper array element? This method will need to work across any array at any of the dimensions.

433,316

10

0

null

2009-01-11 17:52:30.64 UTC

11

2022-01-04 17:09:27.223 UTC

2011-05-25 11:21:02.04 UTC

null

560,648

Gilean

6,305

null

1

20

php|arrays|string|variables

81,947

Quick and dirty: <pre><code>echo eval('return $'. $string . ';'); </code></pre> Of course the input string would need to be be sanitized first. If you don't like quick and dirty... then this will work too and it doesn't require eval which makes even me cringe. It does, however, make assumptions about the string format: <pre><code><?php $data['response'] = array( 'url' => 'http://www.testing.com' ); function extract_data($string) { global $data; $found_matches = preg_match_all('/\[\"([a-z]+)\"\]/', $string, $matches); if (!$found_matches) { return null; } $current_data = $data; foreach ($matches[1] as $name) { if (key_exists($name, $current_data)) { $current_data = $current_data[$name]; } else { return null; } } return $current_data; } echo extract_data('data["response"]["url"]'); ?> </code></pre>

175,881

SQL Server Express 2008 Install Side-by-side w/ SQL 2005 Express Fails

When I try to install a new instance of SQL Server 2008 Express on a development machine with SQL 2005 Express already up and running, the install validation fails because the "SQL 2005 Express tools" are installed and I'm told to remove them. What exactly does that mean? After reading this article: <a href="http://www.asql.biz/Articoli/SQLX08/Art1_5.aspx" rel="noreferrer">http://www.asql.biz/Articoli/SQLX08/Art1_5.aspx</a> I uninstalled the 2005 version of the SQL Management Studio but received the same error from the 2008 installer during my follow-up attempt. Updates 1) Uninstalled the SQL 2005 Management Studio only. Received the same error from the 2008 install. 2) Removed all SQL 2005 common components. Received the same error from the 2008 install. 3) Installed the shared components from the SQL 2008 installation program. Received the same error from the 2008 install when trying to install the new SQL 2008 instance. 4) Uninstalled SQL 2008 components, rebooted, re-installed SQL 2005 Management Studio from installation media, rebooted, un-installed SQL 2005 Workstation Components from Control Panel, re-booted. Installation of SQL 2008 is now proceeding as it should. Seems likely that if I'd re-booted after update 2 above things would have gone more smoothly. :-(

175,894

10

1

null

2008-10-06 19:46:38.027 UTC

11

2014-12-14 23:35:23.087 UTC

2008-10-07 13:59:20.69 UTC

marc

12,260

marc

12,260

null

1

41

sql-server

101,993

Although you should have no problem running a 2005 instance of the database engine beside a 2008 instance, The tools are installed into a shared directory, so you can't have two versions of the tools installed. Fortunately, the 2008 tools are backwards-compatible. As we speak, I'm using SSMS 2008 and Profiler 2008 to manage my 2005 Express instances. Works great. Before installing the 2008 tools, you need to remove any and all "shared" components from 2005. Try going to your Add/Remove programs control panel, find Microsoft SQL Server 2005, and click "Change." Then choose "Workstation Components" and remove everything there (this will not remove your database engine). I believe the 2008 installer also has an option to upgrade shared components only. You might try that. Good luck!

805,720

Newbie teaching self python, what else should I be learning?

I'm a newbie to programming. I had 1 semester of computer science (we used java). I got an A in the course and was able to do everything assigned, however I'm not sure I really understood it. I ignored the text and learned by looking at sample programs and then trial and error. I was ahead of the class except for two guys who came in knowing java or another OOP language. I'd like to learn Python. I'm also going to build a second PC from extra parts I have and use linux. Basically, I want to enhance my knowledge of computers. Thats my motivation. Now on learning python are there any good programming theory books that would be useful? Or should I read up on more on how computers operate on the lowest levels? I don't think I know enough to ask the question I want. I guess to make it simple, I am asking what should I know to make the most of learning python. This is not for a career. This is from a desire to know. I am no longer a computer science major (it also would not have any direct applications to my anticipated career.) I'm not looking to learn in "30 days" or "1 week" or whatever. So, starting from a very basic level is fine with me. Thanks in advance. I did a search and didn't quite find what I was looking for. UPDATE: Thanks for all the great advice. I found this site at work and couldn't find it on my home computer, so I am just getting to read now.

805,775

11

0

null

2009-04-30 07:08:06.503 UTC

9

2013-10-22 08:10:45.693 UTC

2009-08-05 18:40:39.41 UTC

null

120,888

null

98,312

null

1

10

python|theory

3,411

My recommendation is always to start at the high level of abstraction. You don't need to know how logic gates work and how you can use them to build a CPU -- it's cool stuff, but it's cool stuff that makes a lot more sense once you've messed around at the higher levels. Python is therefore an excellent choice as a learning aid. <a href="http://www.greenteapress.com/thinkpython/thinkCSpy/" rel="nofollow noreferrer">How to Think Like A Computer Scientist: Learning With Python</a> is available on the Internet and is an excellent introduction to the high-level concepts that make computers go. And it's even Python-specific. If you're looking to have your brain turned inside-out, <a href="http://mitpress.mit.edu/sicp/full-text/book/book.html" rel="nofollow noreferrer">SICP</a> will do a good job of it. I don't recommend it as a first text, though; it's heavy going. Both of these books are high-level. They won't teach you anything about the low-level details like memory structures or what a CPU actually does, but that's something I would reserve for later anyway. D'A

409,256

Working with byte arrays in C#

I have a byte array that represents a complete TCP/IP packet. For clarification, the byte array is ordered like this: (IP Header - 20 bytes)(TCP Header - 20 bytes)(Payload - X bytes) I have a <code>Parse</code> function that accepts a byte array and returns a <code>TCPHeader</code> object. It looks like this: <pre><code>TCPHeader Parse( byte[] buffer ); </code></pre> Given the original byte array, here is the way I'm calling this function right now. <pre><code>byte[] tcpbuffer = new byte[ 20 ]; System.Buffer.BlockCopy( packet, 20, tcpbuffer, 0, 20 ); TCPHeader tcp = Parse( tcpbuffer ); </code></pre> Is there a convenient way to pass the TCP byte array, i.e., bytes 20-39 of the complete TCP/IP packet, to the <code>Parse</code> function without extracting it to a new byte array first? In C++, I could do the following: <pre><code>TCPHeader tcp = Parse( &packet[ 20 ] ); </code></pre> Is there anything similar in C#? I want to avoid the creation and subsequent garbage collection of the temporary byte array if possible.

409,269

11

2

null

2009-01-03 16:00:03.28 UTC

4

2018-01-29 02:01:21.873 UTC

2011-05-26 18:27:22.053 UTC

Matt Davis

50,776

Matt Davis

51,170

null

1

13

c#|.net|networking|.net-3.5|bytearray

44,010

A common practice you can see in the .NET framework, and that I recommend using here, is specifying the offset and length. So make your Parse function also accept the offset in the passed array, and the number of elements to use. Of course, the same rules apply as if you were to pass a pointer like in C++ - the array shouldn't be modified or else it may result in undefined behavior if you are not sure when exactly the data will be used. But this is no problem if you are no longer going to be modifying the array.

1,068,881

jQuery remove HTML table column

I have a HTML table like this: <pre><code><table border="1"> <tbody> <tr> <td><a href="#" class="delete">DELETE ROW</a>COL 1</td> <td><a href="#" class="delete">DELETE COL</a>COL 2</td> <td><a href="#" class="delete">DELETE COL</a>COL 3</td> <td><a href="#" class="delete">DELETE COL</a>COL 4</td> <td><a href="#" class="delete">DELETE COL</a>COL 5</td> <td><a href="#" class="delete">DELETE COL</a>COL 6</td> </tr> <tr> <td>ROW 1</td> <td>ROW 1</td> <td>ROW 1</td> <td>ROW 1</td> <td>ROW 1</td> <td>ROW 1</td> </tr> <tr> <td>ROW 2</td> <td>ROW 2</td> <td>ROW 2</td> <td>ROW 2</td> <td>ROW 2</td> <td>ROW 2</td> </tr> </tbody> </table> </code></pre> I need a function to remove the specified column when I click on the link with the class "delete". Can you help ?

1,068,902

11

0

null

2009-07-01 12:25:57.007 UTC

12

2016-09-29 16:01:36.123 UTC

null

4,370,109

null

56,409

null

1

24

jquery|html-table

73,105

After a few years, it's probably time to update the answer on this question. <pre><code>// Listen for clicks on table originating from .delete element(s) $("table").on("click", ".delete", function ( event ) { // Get index of parent TD among its siblings (add one for nth-child) var ndx = $(this).parent().index() + 1; // Find all TD elements with the same index $("td", event.delegateTarget).remove(":nth-child(" + ndx + ")"); }); </code></pre>

127,477

Detecting WPF Validation Errors

In WPF you can setup validation based on errors thrown in your Data Layer during Data Binding using the <code>ExceptionValidationRule</code> or <code>DataErrorValidationRule</code>. Suppose you had a bunch of controls set up this way and you had a Save button. When the user clicks the Save button, you need to make sure there are no validation errors before proceeding with the save. If there are validation errors, you want to holler at them. In WPF, how do you find out if any of your Data Bound controls have validation errors set?

4,650,392

11

0

null

2008-09-24 14:22:10.7 UTC

53

2022-09-01 19:33:29.767 UTC

2015-04-22 11:17:24.12 UTC

null

1,468,295

Kevin Berridge

4,407

null

1

120

wpf|validation|data-binding

66,921

This post was extremely helpful. Thanks to all who contributed. Here is a LINQ version that you will either love or hate. <pre><code>private void CanExecute(object sender, CanExecuteRoutedEventArgs e) { e.CanExecute = IsValid(sender as DependencyObject); } private bool IsValid(DependencyObject obj) { // The dependency object is valid if it has no errors and all // of its children (that are dependency objects) are error-free. return !Validation.GetHasError(obj) && LogicalTreeHelper.GetChildren(obj) .OfType<DependencyObject>() .All(IsValid); } </code></pre>

664,432

How do I programmatically change file permissions?

In Java, I'm dynamically creating a set of files and I'd like to change the file permissions on these files on a linux/unix file system. I'd like to be able to execute the Java equivalent of <code>chmod</code>. Is that possible Java 5? If so, how? I know in Java 6 the <code>File</code> object has <code>setReadable()</code>/<code>setWritable()</code> methods. I also know I could make a system call to do this, but I'd like to avoid that if possible.

664,443

11

1

null

2009-03-19 23:21:21.833 UTC

37

2021-02-03 14:55:50.183 UTC

2018-05-09 08:43:17.253 UTC

Roy Rico

1,685,157

Roy Rico

1,580

null

1

143

java|filesystems

210,477

Full control over file attributes is available in Java 7, as part of the "new" New IO facility (<a href="http://jcp.org/en/jsr/detail?id=203" rel="noreferrer">NIO.2</a>). For example, POSIX permissions can be set on an existing file with <a href="http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#setPosixFilePermissions%28java.nio.file.Path,%20java.util.Set%29" rel="noreferrer"><code>setPosixFilePermissions()</code>,</a> or atomically at file creation with methods like <a href="https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#createFile(java.nio.file.Path,%20java.nio.file.attribute.FileAttribute...)" rel="noreferrer"><code>createFile()</code></a> or <a href="https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#newByteChannel(java.nio.file.Path,%20java.util.Set,%20java.nio.file.attribute.FileAttribute...)" rel="noreferrer"><code>newByteChannel()</code>.</a> You can create a set of permissions using <code>EnumSet.of()</code>, but the helper method <a href="https://docs.oracle.com/javase/7/docs/api/java/nio/file/attribute/PosixFilePermissions.html#fromString(java.lang.String)" rel="noreferrer"><code>PosixFilePermissions.fromString()</code></a> will uses a conventional format that will be more readable to many developers. For APIs that accept a <code>FileAttribute</code>, you can wrap the set of permissions with with <a href="https://docs.oracle.com/javase/7/docs/api/java/nio/file/attribute/PosixFilePermissions.html#asFileAttribute(java.util.Set)" rel="noreferrer"><code>PosixFilePermissions.asFileAttribute()</code>.</a> <pre><code>Set<PosixFilePermission> ownerWritable = PosixFilePermissions.fromString("rw-r--r--"); FileAttribute<?> permissions = PosixFilePermissions.asFileAttribute(ownerWritable); Files.createFile(path, permissions); </code></pre> In earlier versions of Java, using native code of your own, or <code>exec</code>-ing command-line utilities are common approaches.

201,893

WARNING: UNPROTECTED PRIVATE KEY FILE! when trying to SSH into Amazon EC2 Instance

I'm working to set up Panda on an Amazon EC2 instance. I set up my account and tools last night and had no problem using SSH to interact with my own personal instance, but right now I'm not being allowed permission into Panda's EC2 instance. <a href="http://pandastream.com/docs/getting_started" rel="noreferrer">Getting Started with Panda</a> I'm getting the following error: <pre><code>@ WARNING: UNPROTECTED PRIVATE KEY FILE! @ Permissions 0644 for '~/.ec2/id_rsa-gsg-keypair' are too open. It is recommended that your private key files are NOT accessible by others. This private key will be ignored. </code></pre> I've chmoded my keypair to 600 in order to get into my personal instance last night, and experimented at length setting the permissions to 0 and even generating new key strings, but nothing seems to be working. Any help at all would be a great help! <hr> Hm, it seems as though unless permissions are set to 777 on the directory, the ec2-run-instances script is unable to find my keyfiles. I'm new to SSH so I might be overlooking something.

217,729

12

5

null

2008-10-14 16:31:01.35 UTC

49

2022-01-12 17:33:01.347 UTC

2013-02-28 08:03:04.117 UTC

Stu Thompson

650,722

Bryan Woods

2,293

null

1

237

ssh|amazon-web-services|amazon-ec2|chmod

220,917

<blockquote> I've chmoded my keypair to 600 in order to get into my personal instance last night, </blockquote> And this is the way it is supposed to be. From the <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html" rel="noreferrer">EC2 documentation</a> we have "If you're using OpenSSH (or any reasonably paranoid SSH client) then you'll probably need to set the permissions of this file so that it's only readable by you." The Panda documentation you link to links to Amazon's documentation but really doesn't convey how important it all is. The idea is that the key pair files are like passwords and need to be protected. So, the ssh client you are using requires that those files be secured and that only your account can read them. Setting the directory to 700 really should be enough, but 777 is not going to hurt as long as the files are 600. Any problems you are having are client side, so be sure to include local OS information with any follow up questions!

463,642

How can I convert seconds into (Hour:Minutes:Seconds:Milliseconds) time?

How can I convert seconds into (Hour:Minutes:Seconds:Milliseconds) time? Let's say I have 80 seconds; are there any specialized classes/techniques in .NET that would allow me to convert those 80 seconds into (00h:00m:00s:00ms) format like <code>Convert.ToDateTime</code> or something?

463,668

13

0

null

2009-01-21 00:10:42.95 UTC

57

2022-04-06 22:40:29.04 UTC

null

17,142,802

John Gates

null

1

339

c#|datetime

392,195

For .Net <= 4.0 Use the TimeSpan class. <pre><code>TimeSpan t = TimeSpan.FromSeconds( secs ); string answer = string.Format("{0:D2}h:{1:D2}m:{2:D2}s:{3:D3}ms", t.Hours, t.Minutes, t.Seconds, t.Milliseconds); </code></pre> (As noted by Inder Kumar Rathore) For .NET > 4.0 you can use <pre><code>TimeSpan time = TimeSpan.FromSeconds(seconds); //here backslash is must to tell that colon is //not the part of format, it just a character that we want in output string str = time .ToString(@"hh\:mm\:ss\:fff"); </code></pre> (From Nick Molyneux) Ensure that seconds is less than <code>TimeSpan.MaxValue.TotalSeconds</code> to avoid an exception.

1,063,497

Hidden Features of Erlang

In the spirit of: <ul> <li>Hidden Features of C#</li> <li>Hidden Features of Java</li> <li>Hidden Features of ASP.NET</li> <li>Hidden Features of Python</li> <li>Hidden Features of HTML</li> <li>and other Hidden Features questions</li> </ul> What are the hidden features of Erlang that every Erlang developer should be aware of? One hidden feature per answer, please.

1,064,479

17

3

2009-07-28 16:20:36.093 UTC

2009-06-30 12:52:10.173 UTC

59

2011-02-28 11:17:02.14 UTC

2009-12-14 21:11:38.693 UTC

null

13,531

null

64,253

null

1

17

erlang|hidden-features

10,482

The magic commands in the shell. The full list is in <a href="http://www.erlang.org/doc/man/shell.html" rel="nofollow noreferrer">the manual</a>, but the ones I use most are: <ul> <li>f() - forget all variables</li> <li>f(X) - forget X</li> <li>v(42) - recall result from line 42</li> <li>v(-1) - recall result from previous line</li> <li>e(-1) - reexecute expression on previous line</li> <li>rr(foo) - read record definitions from module foo</li> <li>rr("*/*") - read record definitions from every module in every subdirectory</li> <li>rp(expression) - print full expression with record formating</li> </ul>

122,407

What's the nearest substitute for a function pointer in Java?

I have a method that's about ten lines of code. I want to create more methods that do exactly the same thing, except for a small calculation that's going to change one line of code. This is a perfect application for passing in a function pointer to replace that one line, but Java doesn't have function pointers. What's my best alternative?

122,414

22

6

null

2008-09-23 17:20:10.7 UTC

119

2020-09-07 11:54:54.703 UTC

2012-07-09 16:47:43.637 UTC

null

1,288

Bill the Lizard

1,288

null

1

306

java|closures|function-pointers

91,211

Anonymous inner class Say you want to have a function passed in with a <code>String</code> param that returns an <code>int</code>. First you have to define an interface with the function as its only member, if you can't reuse an existing one. <pre><code>interface StringFunction { int func(String param); } </code></pre> A method that takes the pointer would just accept <code>StringFunction</code> instance like so: <pre><code>public void takingMethod(StringFunction sf) { int i = sf.func("my string"); // do whatever ... } </code></pre> And would be called like so: <pre><code>ref.takingMethod(new StringFunction() { public int func(String param) { // body } }); </code></pre> EDIT: In Java 8, you could call it with a lambda expression: <pre><code>ref.takingMethod(param -> bodyExpression); </code></pre>

436,014

Why should I use templating system in PHP?

Why should I use templating system in PHP? The reasoning behind my question is: PHP itself is feature rich templating system, why should I install another template engine? The only two pros I found so far are: <ol> <li>A bit cleaner syntax (sometimes)</li> <li>Template engine is not usually powerful enough to implement business logic so it forces you to separate concerns. Templating with PHP can lure you to walk around the templating principles and start writing code soup again.</li> </ol> ... and both are quite negligible when compared to cons. Small example: PHP <pre><code><h1><?=$title?></h1> <ul> <? foreach ($items as $item) {?> <li><?=$item?></li> <? } ?> </ul> </code></pre> Smarty <pre><code><h1>{$title}</h1> <ul> {foreach item=item from=$items} <li>{$item}</li> {/foreach} </ul> </code></pre> I really don't see any difference at all.

436,055

25

4

null

2009-01-12 16:37:12.68 UTC

27

2020-01-04 13:30:56.893 UTC

2016-12-21 14:48:50.59 UTC

JS

53,864

JS

53,864

null

1

61

php|smarty|template-engine

13,592

Yes, as you said, if you don't force yourself to use a templating engine inside PHP ( the templating engine ) it becomes easy to slip and stop separating concerns. However, the same people who have problems separating concerns end up generating HTML and feeding it to smarty, or executing PHP code in Smarty, so Smarty's hardly solving your concern separation problem. See also: <ul> <li><a href="https://stackoverflow.com/questions/62605/php-as-a-template-language-or-some-other-php-templating-script">PHP as a template language or some other templating script </a></li> <li><a href="https://stackoverflow.com/questions/261338/what-is-the-best-way-to-insert-html-via-php">What is the best way to insert HTML via PHP</a></li> </ul>

6,647,166

How do I pattern match arrays in Scala?

My method definition looks as follows <pre><code>def processLine(tokens: Array[String]) = tokens match { // ... </code></pre> Suppose I wish to know whether the second string is blank <pre><code>case "" == tokens(1) => println("empty") </code></pre> Does not compile. How do I go about doing this?

6,647,649

4

1

null

2011-07-11 07:49:04.99 UTC

10

2014-01-29 23:58:07.08 UTC

2011-07-11 19:10:48.243 UTC

null

65,299

null

144,152

null

1

74

scala

41,004

If you want to pattern match on the array to determine whether the second element is the empty string, you can do the following: <pre><code>def processLine(tokens: Array[String]) = tokens match { case Array(_, "", _*) => "second is empty" case _ => "default" } </code></pre> The <code>_*</code> binds to any number of elements including none. This is similar to the following match on Lists, which is probably better known: <pre><code>def processLine(tokens: List[String]) = tokens match { case _ :: "" :: _ => "second is empty" case _ => "default" } </code></pre>

6,833,558

Replace Console.WriteLine in NUnit

I haven't done much with NUnit before, but I just wanted to dump some text to a window in a console type fashion. For example: <pre class="lang-cs prettyprint-override"><code>Console.WriteLine("... some information..."); </code></pre> That won't work of course because NUnit is driving things. I'm in the middle of building some unit tests and want to dump a list of variable values for inspection during debug. It isn't strictly a unit test if I need to do this, I admit that, but it would be convenient.

6,833,590

5

0

null

2011-07-26 16:43:56.19 UTC

8

2022-05-12 15:18:25.3 UTC

2020-12-30 00:08:47.57 UTC

null

1,402,846

null

685,711

null

1

60

c#|.net|debugging|nunit

57,610

You can see the console output. You just have to select the "Text Output" tab in the NUnit GUI runner. <img src="https://i.stack.imgur.com/vIjTv.png" alt="Enter image description here" /> If you are using the ReSharper test runner, the console output should be displayed. Ensure that the test runner output window is displayed by clicking the <a href="https://www.jetbrains.com/help/resharper/Reference__Windows__Unit_Test_Sessions.html#showOutputRow-1-td-0-control" rel="nofollow noreferrer">"Show Output" button</a> in the test runner tool bar: <img src="https://i.stack.imgur.com/wQWtf.png" alt="Enter image description here" /> You should then get something as follows: <img src="https://i.stack.imgur.com/TCqY1.png" alt="Enter image description here" />

6,754,919

JSON.stringify function

I have an object that has some properties and methods, like so: <pre><code>{name: "FirstName", age: "19", load: function () {}, uniq: 0.5233059714082628} </code></pre> and I have to pass this object to another function. So I tried to use JSON.stringify(obj) but the load function (which of course isn't empty, this is just for the purpose of this example) is being "lost". Is there any way to <code>stringify</code> and object and maintain the methods it has? Thanks!

6,755,006

6

2

null

2011-07-19 22:34:07.193 UTC

14

2021-10-08 14:26:26.013 UTC

2015-09-30 12:34:27.137 UTC

null

3,154,233

null

848,941

null

1

42

javascript|json|object

46,684

Why exactly do you want to stringify the object? JSON doesn't understand functions (and it's not supposed to). If you want to pass around objects why not do it one of the following ways? <pre><code>var x = {name: "FirstName", age: "19", load: function () {alert('hai')}, uniq: 0.5233059714082628}; function y(obj) { obj.load(); } // works y({name: "FirstName", age: "19", load: function () {alert('hai')}, uniq: 0.5233059714082628}); // "safer" y(({name: "FirstName", age: "19", load: function () {alert('hai')}, uniq: 0.5233059714082628})); // how it's supposed to be done y(x); </code></pre>

6,747,176

How can I remove a background-image attribute?

I have this code : <pre><code>if (pansel.val() == "1") $(#myDiv).css('background-image', 'url(/private_images/guida_check_category.jpg)'); else $(#myDiv).css({ 'background-color': '#ffffff' }); </code></pre> and I see that, when I apply the background-image, the follow code : <pre><code>$(#myDiv).css({ 'background-color': '#ffffff' }); </code></pre> doesnt remove the image and put the white background color. The image still present! How can I totally remove that background-image attribute?

6,747,190

7

0

null

2011-07-19 12:33:11.973 UTC

null

2020-06-28 19:08:59.32 UTC

null

365,251

null

1

21

jquery|css

74,776

Try this: <pre><code>if (pansel.val() == "1") $("#myDiv").css('background-image', 'url(/private_images/guida_check_category.jpg)'); else { $("#myDiv").css({ 'background-color': '#ffffff' }); $("#myDiv").css('background-image', 'none'); } </code></pre>

6,800,894

Django returns 403 error when sending a POST request

when I'm using following Python code to send a POST request to my Django website I'm getting 403: Forbidden error. <pre><code>url = 'http://www.sub.example.com/' values = { 'var': 'test' } try: data = urllib.urlencode(values, doseq=True) req = urllib2.Request(url, data) response = urllib2.urlopen(req) the_page = response.read() except: the_page = sys.exc_info() raise </code></pre> When I'm opening any other website it works properly. <code>example.com</code> is Django website too, and it works properly too. I think, that's Django config problem, can anyone tell me what should I do to provide access to my script?

6,801,207

7

4

null

2011-07-23 14:04:54.67 UTC

11

2022-07-05 09:12:08.527 UTC

null

1,145,388

null

855,472

null

1

49

python|django|http-status-code-403|http-post

83,268

Does the view that you are posting to have a Django Form on it? If so, I wonder if it's giving a csrf error. I think that manifests itself as a 403. In that case, you'd need to add the {{ csrf_token }} tag. Just a thought.

6,980,906

Android Color Picker

I am looking for a Color Picker framework which can return color HEX on selection. I have looked at <a href="https://github.com/danielnilsson9/color-picker-view" rel="noreferrer">this</a> wondering if there is some other library I can use.

6,981,145

8

0

null

2011-08-08 10:39:06.453 UTC

21

2021-06-12 09:50:29.373 UTC

2015-08-19 08:54:36.817 UTC

null

1,196,908

null

155,196

null

1

48

java|android|colors|picker

132,975

try this open source projects that might help you <a href="https://github.com/QuadFlask/colorpicker" rel="noreferrer">https://github.com/QuadFlask/colorpicker</a>

6,825,943

Difference between Console.Read() and Console.ReadLine()?

I'm new to this field and I'm very confused: what is the real difference between <code>Console.Read()</code> and <code>Console.ReadLine()</code>?

6,825,957

12

3

null

2011-07-26 06:05:49.843 UTC

17

2021-04-15 06:56:51.25 UTC

2014-01-29 13:51:36.71 UTC

null

114,770

null

709,458

null

1

38

c#|input|console|inputstream

200,295

<a href="http://msdn.microsoft.com/en-us/library/system.console.read.aspx" rel="noreferrer"><code>Console.Read()</code></a> reads only the next character from standard input, and <a href="http://msdn.microsoft.com/en-us/library/system.console.readline.aspx" rel="noreferrer"><code>Console.ReadLine()</code></a> reads the next line of characters from the standard input stream. Standard input in case of Console Application is input from the user typed words in console UI of your application. Try to create it by Visual studio, and see by yourself.

6,811,372

How to code a BAT file to always run as admin mode?

I have this line inside my BAT file: <pre><code>"Example1Server.exe" </code></pre> I would like to execute this in Administrator mode. How to modify the bat code to run this as admin? Is this correct? Do I need to put the quotes? <pre><code>runas /user:Administrator invis.vbs Example1Server.exe </code></pre>

6,811,394

12

2

null

2011-07-25 02:51:29.8 UTC

53

2022-02-10 12:17:18.74 UTC

2011-07-25 02:59:25.157 UTC

null

192,173

null

192,173

null

1

181

windows|batch-file

806,918

You use <code>runas</code> to launch a program as a specific user: <pre><code>runas /user:Administrator Example1Server.exe </code></pre>

6,745,919

UITableViewCell subview disappears when cell is selected

I'm implementing a color-chooser table view where the user can select amongst, say, 10 colors (depends on the product). The user can also select other options (like hard drive capacity, ...). All color options are inside their own tableview section. I want to display a little square on the left of the textLabel showing the actual color. Right now I'm adding a simple square UIView, give it the correct background color, like this : <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:RMProductAttributesCellID]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:RMProductAttributesCellID] autorelease]; cell.indentationWidth = 44 - 8; UIView *colorThumb = [[[UIView alloc] initWithFrame:CGRectMake(8, 8, 28, 28)] autorelease]; colorThumb.tag = RMProductAttributesCellColorThumbTag; colorThumb.hidden = YES; [cell.contentView addSubview:colorThumb]; } RMProductAttribute *attr = (RMProductAttribute *)[_product.attributes objectAtIndex:indexPath.section]; RMProductAttributeValue *value = (RMProductAttributeValue *)[attr.values objectAtIndex:indexPath.row]; cell.textLabel.text = value.name; cell.textLabel.backgroundColor = [UIColor clearColor]; UIView *colorThumb = [cell viewWithTag:RMProductAttributesCellColorThumbTag]; colorThumb.hidden = !attr.isColor; cell.indentationLevel = (attr.isColor ? 1 : 0); if (attr.isColor) { colorThumb.layer.cornerRadius = 6.0; colorThumb.backgroundColor = value.color; } [self updateCell:cell atIndexPath:indexPath]; return cell; } </code></pre> This displays fine without problems. My only problem is that when I select a "color" row, during the fade-to-blue selection animation, my custom UIView (colorThumb) is hidden. It gets visible again just after the selection/deselection animation ended, but this produces an ugly artifact. What should I do to correct this? Don't I insert the subview at the right place? (There's nothing special in the didSelectRowAtIndexPath, I just change the cell's accessory to a checkbox or nothing, and deselect the current indexPath).

27,717,607

20

3

null

2011-07-19 10:45:07.3 UTC

47

2022-07-30 07:32:20.887 UTC

null

526,547

null

1

177

iphone|ios|uitableview

57,475

<code>UITableViewCell</code> changes the background color of all sub views when cell is selected or highlighted ,You can Solve this problem by overriding Tableview cell's <code>setSelected:animated</code> and <code>setHighlighted:animated</code> and resetting view background color. In Objective C : <pre><code>- (void)setSelected:(BOOL)selected animated:(BOOL)animated { UIColor *color = self.yourView.backgroundColor; [super setSelected:selected animated:animated]; if (selected){ self.yourView.backgroundColor = color; } } -(void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated{ UIColor *color = self.yourView.backgroundColor; [super setHighlighted:highlighted animated:animated]; if (highlighted){ self.yourView.backgroundColor = color; } } </code></pre> In Swift 3.1 : <pre><code>override func setSelected(_ selected: Bool, animated: Bool) { let color = yourView.backgroundColor super.setSelected(selected, animated: animated) if selected { yourView.backgroundColor = color } } override func setHighlighted(_ highlighted: Bool, animated: Bool) { let color = yourView.backgroundColor super.setHighlighted(highlighted, animated: animated) if highlighted { yourView.backgroundColor = color } } </code></pre>

38,263,406

What are differences between SystemJS and Webpack?

I'm creating my first Angular application and I would figure out what is the role of the module loaders. Why we need them? I tried to search and search on Google and I can't understand why we need to install one of them to run our application? Couldn't it be enough to just use <code>import</code> to load stuff from node modules? I have followed <a href="https://angular.io/docs/ts/latest/quickstart.html#!#systemjs" rel="noreferrer">this tutorial</a> (that uses SystemJS) and it makes me to use <code>systemjs.config.js</code> file: <pre><code>/** * System configuration for Angular samples * Adjust as necessary for your application needs. */ (function(global) { // map tells the System loader where to look for things var map = { 'app': 'transpiled', // 'dist', '@angular': 'node_modules/@angular', 'angular2-in-memory-web-api': 'node_modules/angular2-in-memory-web-api', 'rxjs': 'node_modules/rxjs' }; // packages tells the System loader how to load when no filename and/or no extension var packages = { 'app': { main: 'main.js', defaultExtension: 'js' }, 'rxjs': { defaultExtension: 'js' }, 'angular2-in-memory-web-api': { main: 'index.js', defaultExtension: 'js' }, }; var ngPackageNames = [ 'common', 'compiler', 'core', 'forms', 'http', 'platform-browser', 'platform-browser-dynamic', 'router', 'router-deprecated', 'upgrade', ]; // Individual files (~300 requests): function packIndex(pkgName) { packages['@angular/'+pkgName] = { main: 'index.js', defaultExtension: 'js' }; } // Bundled (~40 requests): function packUmd(pkgName) { packages['@angular/'+pkgName] = { main: '/bundles/' + pkgName + '.umd.js', defaultExtension: 'js' }; } // Most environments should use UMD; some (Karma) need the individual index files var setPackageConfig = System.packageWithIndex ? packIndex : packUmd; // Add package entries for angular packages ngPackageNames.forEach(setPackageConfig); var config = { map: map, packages: packages }; System.config(config); })(this); </code></pre> Why we need this configuration file? Why we need SystemJS (or WebPack or others)? Finally, in your opinion what is the better?

38,263,593

3

2

null

2016-07-08 09:36:18.147 UTC

91

2021-11-29 23:31:06.057 UTC

null

1,205,871

null

2,516,399

null

1

234

javascript|angular|webpack|node-modules|systemjs

98,625

If you go to the SystemJS Github page, you will see the description of the tool: <blockquote> Universal dynamic module loader - loads ES6 modules, AMD, CommonJS and global scripts in the browser and NodeJS. </blockquote> Because you use modules in TypeScript or ES6, you need a module loader. In the case of SystemJS, the <code>systemjs.config.js</code> allows us to configure the way in which module names are matched with their corresponding files. This configuration file (and SystemJS) is necessary if you explicitly use it to import the main module of your application: <pre><code><script> System.import('app').catch(function(err){ console.error(err); }); </script> </code></pre> When using TypeScript, and configuring the compiler to the <code>commonjs</code> module, the compiler creates code that is no longer based on SystemJS. In this example, the typescript compiler config file would appear like this: <pre><code>{ "compilerOptions": { "target": "es5", "module": "commonjs", // <------ "moduleResolution": "node", "sourceMap": true, "emitDecoratorMetadata": true, "experimentalDecorators": true, "removeComments": false, "noImplicitAny": false } } </code></pre> Webpack is a flexible module bundler. This means that it goes further and doesn't only handle modules but also provides a way to package your application (concat files, uglify files, ...). It also provides a dev server with load reload for development. SystemJS and Webpack are different but with SystemJS, you still have work to do (with <a href="http://gulpjs.com/" rel="noreferrer">Gulp</a> or <a href="https://github.com/systemjs/builder" rel="noreferrer">SystemJS builder</a> for example) to package your Angular2 application for production.

15,874,366

Could not load file or assembly 'System.Web.Razor' or one of its dependencies

I used Umbraco 4.11.6 in my website(web application).My website is worked in localhost(tested from Visual studio 2012 and IIS(v7)) but when I run it from internet space I got an error. The error was: <h2>Could not load file or assembly 'System.Web.Razor' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)</h2> <blockquote> Assembly Load Trace: The following information can be helpful to determine why the assembly 'System.Web.Razor' could not be loaded. WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. </blockquote> Stack Trace: <blockquote> <blockquote> [FileLoadException: Could not load file or assembly 'System.Web.Razor' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)] </blockquote> [FileLoadException: Could not load file or assembly 'System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)] System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +0 System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +210 System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection) +242 System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +17 System.Reflection.Assembly.Load(String assemblyString) +35 System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +122 [ConfigurationErrorsException: Could not load file or assembly 'System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)] System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +12761078 System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +503 System.Web.Configuration.AssemblyInfo.get_AssemblyInternal() +142 System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +334 System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath) +203 System.Web.Compilation.BuildManager.ExecutePreAppStart() +152 System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +1151 [HttpException (0x80004005): Could not load file or assembly 'System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +12881540 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +159 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +12722601 Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.17929 </blockquote> a part of WebConfig: <pre><code><runtime>  <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="4.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35" /> <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="4.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-2.0.0.0" newVersion="2.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-2.0.0.0" newVersion="2.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Razor" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-2.0.0.0" newVersion="2.0.0.0" /> </dependentAssembly> <dependentAssembly> <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0" /> </dependentAssembly> </assemblyBinding> </code></pre>

15,887,969

6

3

null

2013-04-08 08:18:00.247 UTC

4

2020-04-03 14:56:57.797 UTC

2013-04-08 08:29:52.5 UTC

null

1,817,640

null

1,817,640

null

1

26

c#|asp.net|asp.net-mvc|deployment|umbraco

67,560

Quite a few ways to fix this: <ol> <li>Install MVC on the web server (which is not always possible).</li> <li>In visual studio you can set dlls to copy to local on build, see the following article (please note MVC dlls have changed names slightly but it gives you the process) <a href="http://haacked.com/archive/2008/11/03/bin-deploy-aspnetmvc.aspx">http://haacked.com/archive/2008/11/03/bin-deploy-aspnetmvc.aspx</a></li> <li>Copy the appropriate dlls from your GAC into the bin folder of the umbraco site. To do this open "%windir%\Microsoft.NET\assembly\GAC_MSIL" in explorer and you will find all of the dlls installed in the GAC and you can copy the appropriate versions into your project. This is similar to the above method but bypasses building the project.</li> </ol> In terms of files you will likely need more than just System.Web.Razor.dll however this will work for all of the missing files.

35,817,558

Why does C# allow making an override async?

In C#, when you override a method, it is permitted to make the override async when the original method was not. This seems like poor form. The problem that makes me wonder is this: I was brought in to assist with a load test problem. At around 500 concurrent users, the login process would break down into a redirect loop. IIS was logging exceptions with the message "An asynchronous module or handler completed while an asynchronous operation was still pending". Some searching led me to think that someone was abusing <code>async void</code>, but my quick searches through the source found nothing. Sadly, I was searching for <code>async\s*void</code> (regex search) when I should have been looking for something more like <code>async\s*[^T]</code> (assuming Task wasn't fully qualified.. you get the point). What I later found was <code>async override void onActionExecuting</code> in a base controller. Clearly that had to be the problem, and it was. Fixing that up (making it synchronous for the moment) resolved the problem. But it left me with a question: Why can you mark an override as async when the calling code could never await it?

35,818,404

3

21

null

2016-03-05 17:48:08.23 UTC

2

2017-07-24 21:06:37.13 UTC

2017-07-24 20:59:37.613 UTC

null

1,459,996

null

8,513

null

1

45

c#|async-await

22,258

When the base class (or interface) declares a virtual method that returns a Task, you can override it as long as you return Task. The <code>async</code> keyword is just a hint to the compiler to transform your method into a state machine. Although the compiler does it's black magic on your method, the compiled method still returns a Task. <hr> As for <code>void</code> virtual methods, you can override one without the <code>async</code> keyword (obviously) and start a non-awaited Task within it. That's kind of what happens when you override it with the <code>async</code> keyword and use <code>await</code> in the body. The caller would not await the created Task (since the "original" signature is <code>void</code>). Both cases are similar*: <pre><code>public override void MyVirtualMethod() { // Will create a non awaited Task (explicitly) Task.Factory.StartNew(()=> SomeTaskMethod()); } public override async void MyVirtualMethod() { // Will create a non awaited Task (the caller cannot await void) await SomeTaskMethod(); } </code></pre> <a href="https://msdn.microsoft.com/en-us/magazine/jj991977.aspx" rel="noreferrer">Stephen Cleary's article</a> has some notes regarding this: <ul> <li>Void-returning async methods have a specific purpose: to make asynchronous event handlers possible.</li> <li>You should prefer async Task to async void.</li> </ul> *The implementation of <code>SomeTaskMethod</code>, the underlying framework, the SynchronizationContext and other factors might and will cause different outcomes for each of the above methods.

10,321,393

jquery function on toggleClass complete?

How can I do a function once a toggleClass has completed? I've tried the following but with no luck: <pre><code>$("#loader").toggleClass('fadeOut', function () { alert('a'); }); </code></pre>

10,321,923

2

3

null

2012-04-25 18:15:24.78 UTC

12

2018-07-05 15:09:59.647 UTC

2012-04-25 18:20:39.943 UTC

null

572,939

null

1,013,512

null

1

32

jquery

37,625

jQuery has a promise method that returns a promise that resolves after all running animations on selected elements are complete. At that point, you can bind to it's done method. <pre><code>$("#loader").toggleClass('fadeOut',600).promise().done(function(){ console.log('a'); }); </code></pre> <a href="http://jsfiddle.net/skram/4x76J/" rel="nofollow noreferrer">http://jsfiddle.net/skram/4x76J/</a> Note: Animations using <code>toggleClass</code> require jQuery UI.

10,805,589

Convert JSON date string to Python datetime

When translating dates to JSON, javascript is saving dates in this format: <pre><code>2012-05-29T19:30:03.283Z </code></pre> However, I am not sure how to get this into a python datetime object. I've tried these: <pre><code># Throws an error because the 'Z' isn't accounted for: datetime.datetime.strptime(obj[key], '%Y-%m-%dT%H:%M:%S.%f') # Throws an error because '%Z' doesn't know what to do with the 'Z' # at the end of the string datetime.datetime.strptime(obj[key], '%Y-%m-%dT%H:%M:%S.%f%Z') </code></pre> I believe that javascript is saving the string in official ISO format, so it seems that there should be a way to get python's <code>datetime.strptime()</code> to read it?

10,805,633

3

null

2012-05-29 19:40:21.783 UTC

9

2022-07-21 16:39:18.12 UTC

2017-05-28 03:54:29.42 UTC

null

832,230

null

84,131

null

1

50

python|json|datetime|date|iso

50,649

Try the following format: <pre><code>%Y-%m-%dT%H:%M:%S.%fZ </code></pre> For example: <pre><code>>>> datetime.datetime.strptime('2012-05-29T19:30:03.283Z', '%Y-%m-%dT%H:%M:%S.%fZ') datetime.datetime(2012, 5, 29, 19, 30, 3, 283000) </code></pre> The <code>Z</code> in the date just means that it should be interpreted as a UTC time, so ignoring it won't cause any loss of information. You can find this information here: <a href="http://www.w3.org/TR/NOTE-datetime" rel="noreferrer">http://www.w3.org/TR/NOTE-datetime</a>

10,419,530

Multi line preprocessor macros

How to make multi line preprocessor macro? I know how to make one line: <pre><code>#define sqr(X) (X*X) </code></pre> but I need something like this: <pre><code>#define someMacro(X) class X : public otherClass { int foo; void doFoo(); }; </code></pre> How can I get this to work? This is only an example, the real macro may be very long.

10,419,556

7

3

null

2012-05-02 18:25:57.503 UTC

24

2022-08-22 17:12:43.53 UTC

2015-10-23 14:09:52.69 UTC

null

2,246,488

null

1,023,753

null

1

97

c++|c|c-preprocessor

92,479

You use <code>\</code> as a line continuation escape character. <pre><code>#define swap(a, b) { \ (a) ^= (b); \ (b) ^= (a); \ (a) ^= (b); \ } </code></pre> EDIT: As @abelenky pointed out in the comments, the <code>\</code> character must be the last character on the line. If it is not (even if it is just white space afterward) you will get confusing error messages on each line after it.

10,520,772

In R, how to get an object's name after it is sent to a function?

I am looking for the reverse of <code>get()</code>. Given an object name, I wish to have the character string representing that object extracted directly from the object. Trivial example with <code>foo</code> being the placeholder for the function I am looking for. <pre><code>z <- data.frame(x=1:10, y=1:10) test <- function(a){ mean.x <- mean(a$x) print(foo(a)) return(mean.x)} test(z) </code></pre> Would print: <pre><code> "z" </code></pre> My work around, which is harder to implement in my current problem is: <pre><code>test <- function(a="z"){ mean.x <- mean(get(a)$x) print(a) return(mean.x)} test("z") </code></pre>

10,520,832

5

4

null

2012-05-09 17:05:40.323 UTC

46

2022-09-16 15:08:48.667 UTC

2015-11-09 02:30:26.743 UTC

null

3,576,984

null

742,447

null

1

169

r

67,320

The old deparse-substitute trick: <pre><code>a<-data.frame(x=1:10,y=1:10) test<-function(z){ mean.x<-mean(z$x) nm <-deparse(substitute(z)) print(nm) return(mean.x)} test(a) #[1] "a" ... this is the side-effect of the print() call # ... you could have done something useful with that character value #[1] 5.5 ... this is the result of the function call </code></pre> Edit: Ran it with the new test-object Note: this will not succeed inside a local function when a set of list items are passed from the first argument to <code>lapply</code> (and it also fails when an object is passed from a list given to a <code>for</code>-loop.) You would be able to extract the ".Names"-attribute and the order of processing from the structure result, if it were a named vector that were being processed. <pre><code>> lapply( list(a=4,b=5), function(x) {nm <- deparse(substitute(x)); strsplit(nm, '\\[')} ) $a # This "a" and the next one in the print output are put in after processing $a[[1]] [1] "X" "" "1L]]" # Notice that there was no "a" $b $b[[1]] [1] "X" "" "2L]]" > lapply( c(a=4,b=5), function(x) {nm <- deparse(substitute(x)); strsplit(nm, '\\[')} ) $a $a[[1]] # but it's theoretically possible to extract when its an atomic vector [1] "structure(c(4, 5), .Names = c(\"a\", \"b\"))" "" [3] "1L]]" $b $b[[1]] [1] "structure(c(4, 5), .Names = c(\"a\", \"b\"))" "" [3] "2L]]" </code></pre>

24,990,554

How to include a font .ttf using CSS?

I have a problem with my code. Because I want to include a global font for my page and I downloaded a .ttf file. And I include it in my main CSS but my font wont change. Here's my simple code: <pre><code>@font-face { font-family: 'oswald'; src: url('/font/oswald.regular.ttf'); } html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin:0; padding:0; border:0; font-size:100%; font:inherit; font-family: oswald; vertical-align:baseline } </code></pre> I don't know where did I go wrong. Can you help me with this? Thanks.

24,990,647

4

8

null

2014-07-28 07:39:22.1 UTC

43

2022-09-01 06:17:02.477 UTC

2014-07-28 07:49:50.763 UTC

null

2,706,036

null

2,706,036

null

1

191

html|css

369,877

Only providing .ttf file for webfont won't be good enough for cross-browser support. The best possible combination at present is using the combination as : <pre class="lang-css prettyprint-override"><code>@font-face { font-family: 'MyWebFont'; src: url('webfont.eot'); /* IE9 Compat Modes */ src: url('webfont.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */ url('webfont.woff') format('woff'), /* Modern Browsers */ url('webfont.ttf') format('truetype'), /* Safari, Android, iOS */ url('webfont.svg#svgFontName') format('svg'); /* Legacy iOS */ } </code></pre> This code assumes you have .eot , .woff , .ttf and svg format for you webfont. To automate all this process , you can use : <a href="https://transfonter.org" rel="nofollow noreferrer">Transfonter.org</a>. Also , modern browsers are shifting towards .woff font , so you can probably do this too : <pre class="lang-css prettyprint-override"><code>@font-face { font-family: 'MyWebFont'; src: url('myfont.woff') format('woff'), /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */ url('myfont.ttf') format('truetype'); /* Chrome 4+, Firefox 3.5, Opera 10+, Safari 3—5 */ } </code></pre> Read more here : <a href="http://css-tricks.com/snippets/css/using-font-face/" rel="nofollow noreferrer">http://css-tricks.com/snippets/css/using-font-face/</a> <hr /> Look for browser support : <a href="http://caniuse.com/#feat=fontface" rel="nofollow noreferrer">Can I Use fontface</a>

46,629,170

Firestore security rule get() not work

<h1>The solution is in the end of the post. Check it out.</h1> <h1>Решение проблемы в конце поста. Дочитайте.</h1> just a simple question: whats wrong with this and why this is not working? Trying to get access with user who has role 'admin' in users section to the /titles/{anyTitle} but still get <blockquote> Missing or insufficient permissions. </blockquote> <pre><code>service cloud.firestore { match /databases/{database}/documents { match /{document=**} { allow write: if false; allow read: if false; } function userCanWrite () { return get(/databases/{database}/documents/users/$(request.auth.uid)).data.role == "admin"; } match /titles/{anyTitle=**} { allow read: if request.auth != null; allow write: if userCanWrite(); } } } </code></pre> <a href="https://i.stack.imgur.com/j30cP.png" rel="noreferrer">Here is my database structure</a> <h2>P.S.</h2> I tried another rule from official documents <code>get(/databases/{database}/documents/users/$(request.auth.uid‌)).data.isAdmin == true;</code> and this is not working too <h1>UPDATE: CORRECT WAY TO DO IT</h1> Support helped me find the solution this is how you should do: db structure: <blockquote> users -> {{ userid }} -> { role: "admin" } </blockquote> database rule settings: <blockquote> get(usersPath/$(request.auth.uid)).role == "admin" || get(usersPath/$(request.auth.uid)).data.role == "admin"; </blockquote>

46,681,577

5

11

null

2017-10-08 08:45:57.677 UTC

10

2020-04-08 08:15:34.513 UTC

2017-10-13 09:14:16.563 UTC

null

8,740,159

null

8,740,159

null

1

17

firebase|firebase-security|google-cloud-firestore

9,993

I contacted to the Firebase support to report that bug and they gave me a temporary solution on this. It seems that they are having a bug in their systems on the security rules side. They say that the documentation is ok, but for now we should workaround this way: <pre><code>get(path).data.field == true || get(path).field == true; </code></pre> Because the bug is that data object isn't populated, you should check both properties. There's no ETA for launching a solution on this bug, so I asked they if they could give me an advice when they solved this issue, so I'll keep this answer up-to-date with their information.

33,854,103

Why were Javascript `atob()` and `btoa()` named like that?

In Javascript, <code>window.atob()</code> method decodes a base64 string and <code>window.btoa()</code> method encodes a <code>string</code> into base64. Then why weren't they named like <code>base64Decode()</code> and <code>base64Encode()</code>? <code>atob()</code> and <code>btoa()</code> don't make sense because they're not semantic at all. I want to know the reason.

33,854,127

5

6

null

2015-11-22 11:11:59.28 UTC

46

2022-01-21 17:49:37.95 UTC

2018-10-06 08:54:55.25 UTC

null

4,510,033

null

4,510,033

null

1

396

javascript

105,685

The <code>atob()</code> and <code>btoa()</code> methods allow authors to transform content to and from the base64 encoding. <blockquote> In these APIs, for mnemonic purposes, the "b" can be considered to stand for "binary", and the "a" for "ASCII". In practice, though, for primarily historical reasons, both the input and output of these functions are Unicode strings. </blockquote> From : <a href="http://www.w3.org/TR/html/webappapis.html#atob">http://www.w3.org/TR/html/webappapis.html#atob</a>

33,431,953

How is conditional_wait() implemented at the kernel and hardware/assembly level?

I understand that the thread that waits on a conditional variable, atomically releases the lock and goes to sleep until is waken by a conditional signal from another thread (when a particular condition is met). After it wakes up, it atomically re-acquires the lock (somehow magically) and updates as required and unlocks the critical section. It would be great if someone could explain how this conditional_wait() procedure implemented at the kernel and the hardware/assembly level? How is the lock released and re-acquired atomically? How does the kernel ensure it? What does sleep here actually mean? Does it mean a context switch to another process/thread? During thread sleep, how is this thread awaken by signaling implemented at the kernel level and if any hardware specific support is provided for these mechanisms? Edit: It seems "futex" is the guy managing this wait/signal stuff. To narrow down my question: How the futex system call for waiting and notifying condition variables is implemented/works at the low level?

33,438,201

1

10

null

2015-10-30 08:50:51.257 UTC

10

2018-07-04 17:19:11.81 UTC

2015-10-30 12:42:40.067 UTC

null

2,733,779

null

2,733,779

null

1

20

c|multithreading|linux-kernel|synchronization|mutex

4,162

On a high level (and since you are asking this question, high level is what you need) it is not that complicated. First, you need to know the layers of responsibility. There are basically 3 layers: <ul> <li>Hardware level - usually something which can be coded in a single ASM instruction</li> <li>Kernel level - something which OS kernel does</li> <li>Application level - something which application does</li> </ul> Generally, those responsibilities are not overlapping - kernel can not do what only hardware can do, hardware can not do what only kernel can do. Having this in mind, it is useful to remember that when it comes to locking, there is very little hardware knows about it. It pretty much boils down to <ul> <li>atomic arithmetics - hardware can lock a particular memory region (make sure no other threads access it), perform arithmetic operation on it and unlock the region. This can only work on the arithmetics natively supported by the chip (no square roots!) and on the sizes natively supported by hardware</li> <li>Memory barriers or fences - that is, introduce a barrier within a flow of instructions, so that when CPU reorders instructions or uses memory caches, they will not cross those fences and the cache will be fresh</li> <li>Conditional setting (compare-and-set) - set memory region to value A if it is B and report the status of this operation (was it set or not)</li> </ul> That's pretty much all CPU can do. As you see, there is no futex, mutex or conditional variables here. This stuff is made by kernel having CPU-supported operations at it's disposal. Let's look in a very high level how kernel might implement futex call. Actually, futex is slightly complicated, because it is mixture of user-level calls and kernel-level calls as needed. Let's look into 'pure' mutex, implemented solely in kernel space. On a high level, it will be demonstrational enough. When mutex is initially created, kernel associates a memory region with it. This region will hold a value of mutex being locked or unlocked. Later, kernel is asked to lock the mutex, it first instructs CPU to issue memory barrier. A mutex must serve as a barrier, so that everything read/written after mutex is acquired (or released) is visible to the rest of CPUs. Then, it uses CPU-supported compare-and-set instruction to set memory region value to 1 if it was set to 0. (there are more complicated reentrant mutexes, but let's not complicate the picture with them). It is guaranteed by CPU that even if more then one thread attempts to do this at the same time, only one will succeed. If the operation succeeds, we now 'hold the mutex'. Once kernel is asked to release the mutex, memory region is set to 0 (there is no need to do this conditionally, since we know we hold the mutex!) and another memory barrier is issued. Kernel also updates the mutex status in it's tables - see below. If mutex locking fails, kernel adds the thread to it's tables which list threads waiting on particular mutex to be released. When the mutex is released, kernel checks what thread(s) are waiting on this mutex, and 'schedules' (i.e. prepares for execution) one of those (in case there is more than one, which one will be scheduled or awaken depends on multitude of factors, in the simplest case it is simply random). The thread scheduled begins executing, locks the mutex again (at this point it can fail again!) and the cycle of life continues. Hope it does make at least half-sense :)

13,294,468

Alter column in SQL Server

What is correct syntax for an <code>ALTER</code> statement to add a default value to an existing column? I can add new column with no errors: <pre><code>ALTER TABLE tb_TableName ADD Record_Status varchar(20) </code></pre> But If I try to alter existing column to apply default value by using the following statement: <pre><code>ALTER TABLE tb_TableName ALTER COLUMN Record_Status VARCHAR(20) NOT NULL DEFAULT '' </code></pre> or <pre><code>ALTER TABLE tb_TableName ALTER Record_Status VARCHAR(20) NOT NULL DEFAULT '' </code></pre> I have get an error: <blockquote> Incorrect syntax near 'Record_Status'. </blockquote>

13,294,539

3

0

null

2012-11-08 17:31:26.913 UTC

3

2018-05-01 12:31:44.177 UTC

2012-11-08 18:22:35.58 UTC

null

13,302

null

201,889

null

1

29

sql|sql-server-2008

107,661

I think you want this syntax: <pre><code>ALTER TABLE tb_TableName add constraint cnt_Record_Status Default '' for Record_Status </code></pre> Based on some of your comments, I am going to guess that you might already have <code>null</code> values in your table which is causing the alter of the column to <code>not null</code> to fail. If that is the case, then you should run an <code>UPDATE</code> first. Your script will be: <pre><code>update tb_TableName set Record_Status = '' where Record_Status is null ALTER TABLE tb_TableName ALTER COLUMN Record_Status VARCHAR(20) NOT NULL ALTER TABLE tb_TableName ADD CONSTRAINT DEF_Name DEFAULT '' FOR Record_Status </code></pre> See <a href="http://sqlfiddle.com/#!18/d7797/1" rel="noreferrer">SQL Fiddle with demo</a>

13,593,900

How to get around lack of covariance with IReadOnlyDictionary?

I'm trying to expose a read-only dictionary that holds objects with a read-only interface. Internally, the dictionary is write-able, and so are the objects within (see below example code). My problem is that IReadOnlyDictionary doesn't support covariant conversions because of the reason outlined in the question <a href="https://stackoverflow.com/questions/2149589/idictionarytkey-tvalue-in-net-4-not-covariant">here</a>. This means I can't just expose my internal dictionary as a read only one. So my question is, is there an efficient way to convert my internal dictionary to an IReadOnlyDictionary, or some other way to handle this? The options I can think of are: <ol> <li>Hold two internal dictionaries and keep them in sync.</li> <li>Create a new dictionary when the property is accessed and cast all the objects within.</li> <li>Cast the IReadOnly's back to NotReadOnly when using it internally.</li> </ol> 1 seems like a pain, 2 seems highly inefficient. 3 sounds like the most promising at the moment, but is still ugly. Do I have any other options? <pre><code>public class ExposesReadOnly { private Dictionary<int, NotReadOnly> InternalDict { get; set; } public IReadOnlyDictionary<int, IReadOnly> PublicList { get { // This doesn't work... return this.InternalDict; } } // This class can be modified internally, but I don't want // to expose this functionality. private class NotReadOnly : IReadOnly { public string Name { get; set; } } } public interface IReadOnly { string Name { get; } } </code></pre>

13,602,918

5

0

null

2012-11-27 21:59:17.617 UTC

3

2017-11-15 04:39:59.937 UTC

2017-05-23 12:17:09.54 UTC

null

-1

null

306,918

null

1

32

c#|.net|dictionary|readonly|covariance

6,936

You could write your own read-only wrapper for the dictionary, e.g.: <pre><code>public class ReadOnlyDictionaryWrapper<TKey, TValue, TReadOnlyValue> : IReadOnlyDictionary<TKey, TReadOnlyValue> where TValue : TReadOnlyValue { private IDictionary<TKey, TValue> _dictionary; public ReadOnlyDictionaryWrapper(IDictionary<TKey, TValue> dictionary) { if (dictionary == null) throw new ArgumentNullException("dictionary"); _dictionary = dictionary; } public bool ContainsKey(TKey key) { return _dictionary.ContainsKey(key); } public IEnumerable<TKey> Keys { get { return _dictionary.Keys; } } public bool TryGetValue(TKey key, out TReadOnlyValue value) { TValue v; var result = _dictionary.TryGetValue(key, out v); value = v; return result; } public IEnumerable<TReadOnlyValue> Values { get { return _dictionary.Values.Cast<TReadOnlyValue>(); } } public TReadOnlyValue this[TKey key] { get { return _dictionary[key]; } } public int Count { get { return _dictionary.Count; } } public IEnumerator<KeyValuePair<TKey, TReadOnlyValue>> GetEnumerator() { return _dictionary .Select(x => new KeyValuePair<TKey, TReadOnlyValue>(x.Key, x.Value)) .GetEnumerator(); } System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() { return this.GetEnumerator(); } } </code></pre>

13,629,507

Celery: How to ignore task result in chord or chain?

I'm using celery, I have several tasks which needed to be executed in order. For example I have this task: <pre><code>@celery.task def tprint(word): print word </code></pre> And I want to do something like this: <pre><code>>>> chain(tprint.s('a') | tprint.s('b'))() </code></pre> Then I get <code>TypeError: tprint() takes exactly 1 argument (2 given)</code>. The same with chord, in this situation which I need a task to be executed after a group of tasks: <pre><code>>>> chord([tprint.s('a'), tprint.s('b')])(tprint.s('c')) </code></pre> So how to deal with this situation? I don't care the result of each task, but they need to be executed in order. <hr> Add a second parameter won't work: <pre><code>@celery.task def tprint(word, ignore=None): print word >>> chain(tprint.s('a', 0) | tprint.s('b'))() </code></pre> This will print out 'a' and 'None'.

13,788,495

4

1

null

2012-11-29 15:51:06.267 UTC

9

2016-10-10 09:37:18.083 UTC

2012-12-04 08:58:13.163 UTC

null

543,492

null

543,492

null

1

43

python|asynchronous|task|celery

17,618

There is a built-in functionality to ignore result in chaining and others - immutable subtask. You can use .si() shortcut instead of .s() or .subtask(immutable=True) More details here: <a href="http://docs.celeryproject.org/en/master/userguide/canvas.html#immutability">http://docs.celeryproject.org/en/master/userguide/canvas.html#immutability</a>

13,357,765

Does ConfigurationManager.AppSettings[Key] read from the web.config file each time?

I'm wondering how the <code>ConfigurationManager.AppSettings[Key]</code> works. Does it read from the physical file each time I need a key? If so, should I be reading all the app settings of my web.config in a cache and then read from it? Or does ASP.NET or IIS load the web.config file only once at application startup? How do I verify whether the physical file is accessed by each read? If I change the web.config, IIS restarts my application, so I can't verify it that way.

13,358,044

3

0

null

2012-11-13 08:48:01.473 UTC

10

2020-06-25 14:03:14.45 UTC

null

5,405,967

null

133,212

null

1

76

c#|asp.net|web-config|configurationmanager

33,346

It gets cached, on first access of a property, so it does not read from the physical file each time you ask for a value. This is why it is necessary to restart an Windows app (or <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.refreshsection.aspx" rel="noreferrer">Refresh</a> the config) to get the latest value, and why an ASP.Net app automatically restarts when you edit web.config. Why ASP.Net is hard wired to restart is discussed in the references in the answer <a href="https://stackoverflow.com/a/613836/1073107">How to prevent an ASP.NET application restarting when the web.config is modified</a>. We can verify this using <a href="http://ilspy.net/" rel="noreferrer">ILSpy</a> and looking at the internals of System.Configuration: <pre><code>public static NameValueCollection AppSettings { get { object section = ConfigurationManager.GetSection("appSettings"); if (section == null || !(section is NameValueCollection)) { throw new ConfigurationErrorsException(SR.GetString("Config_appsettings_declaration_invalid")); } return (NameValueCollection)section; } } </code></pre> At first, this does indeed look like it will get the section every time. Looking at GetSection: <pre><code>public static object GetSection(string sectionName) { if (string.IsNullOrEmpty(sectionName)) { return null; } ConfigurationManager.PrepareConfigSystem(); return ConfigurationManager.s_configSystem.GetSection(sectionName); } </code></pre> The critical line here is the <code>PrepareConfigSystem()</code> method; this initializes an instance of the <code>IInternalConfigSystem</code> field held by the ConfigurationManager - the concrete type is <code>ClientConfigurationSystem</code> As part of this load, an instance of the <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configuration.aspx" rel="noreferrer">Configuration</a> class is instantiated. This class is effectively an object representation of the config file, and appears to be held by the ClientConfigurationSystem's ClientConfigurationHost property in a static field - hence it is cached. You could test this empirically by doing the following (in a Windows Form or WPF app): <ol> <li>Starting your App up </li> <li>Access a value in app.config </li> <li>Make a change to app.config </li> <li>Check to see whether the new value is present </li> <li>Call <code>ConfigurationManager.RefreshSection("appSettings")</code></li> <li>Check to see if the new value is present.</li> </ol> In fact, I could have saved myself some time if I'd just read the comment on the <a href="http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.refreshsection.aspx" rel="noreferrer">RefreshSection</a> method :-) <pre><code>/// <summary>Refreshes the named section so the next time that it is retrieved it will be re-read from disk.</summary> /// <param name="sectionName">The configuration section name or the configuration path and section name of the section to refresh.</param> </code></pre>

51,951,641

Swagger..Unable to render this definition The provided definition does not specify a valid version field

<blockquote> Unable to render this definition The provided definition does not specify a valid version field. Please indicate a valid Swagger or OpenAPI version field. Supported version fields are swagger: "2.0" and those that match openapi: 3.0.n (for example, openapi: 3.0.0). </blockquote> Where do I need to insert the correct version to the stop the error below. Swagger editor works ok, but when launching a particular project I receive this error.First time using Swagger. Many Thanks

51,952,309

10

4

null

2018-08-21 15:05:22.4 UTC

1

2022-08-17 13:33:52.603 UTC

null

6,345,993

null

1

31

javascript|api|swagger

67,438

Your <a href="https://github.com/HaiderMalik12/build-and-secure-restful-api/blob/master/src/config/swagger.json" rel="noreferrer">API definition</a> is missing the OpenAPI/Swagger version number, in this case <code>"swagger": "2.0"</code>. Add it at the beginning, like so: <pre><code>{ "swagger": "2.0", "title" : "Music API Documentation", ... </code></pre>

24,062,123

MongoDB Syntax Error Unexpected Token

I am new to MongoDB. I am just following tutorialspoint.com for learning mongoDB. I executed these two commands exactly as given : <pre><code>db.test.save( { a: 1 } ) db.test.find(){ "_id" : ObjectId(5879b0f65a56a454), "a" : 1 } </code></pre> I am getting error SyntaxError: Unexpected Token { Any help is appreciated. Thanks.

24,063,747

3

2

null

2014-06-05 13:53:55.69 UTC

0

2018-11-17 20:45:48.28 UTC

2014-06-05 15:13:33.367 UTC

null

3,276,627

null

2,844,579

null

1

4

mongodb|syntax

54,103

Your query: <pre><code> test.find() { "_id" : ObjectId(5879b0f65a56a454), "a" : 1 } </code></pre> Correct query: <pre><code> test.find( { "_id" : ObjectId("5879b0f65a56a454"), "a" : 1 }) </code></pre> you need to include curly braces in the round brackets like ({}) second thing enclose id in quotes, please refer the mongodb manual <a href="http://docs.mongodb.org/manual/reference/method/db.collection.find/" rel="nofollow noreferrer">http://docs.mongodb.org/manual/reference/method/db.collection.find/</a>

24,049,020

NSNotificationCenter addObserver in Swift

How do you add an observer in Swift to the default notification center? I'm trying to port this line of code that sends a notification when the battery level changes. <pre><code>[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryLevelChanged:) name:UIDeviceBatteryLevelDidChangeNotification object:nil]; </code></pre>

24,049,111

16

3

null

2014-06-04 23:02:04.91 UTC

147

2022-08-05 06:16:13.567 UTC

2017-04-09 16:23:30.577 UTC

null

2,303,865

null

284,714

null

1

442

ios|swift|nsnotificationcenter

384,851

It's the same as the Objective-C API, but uses Swift's syntax. Swift 4.2 & Swift 5: <pre><code>NotificationCenter.default.addObserver( self, selector: #selector(self.batteryLevelChanged), name: UIDevice.batteryLevelDidChangeNotification, object: nil) </code></pre> If your observer does not inherit from an Objective-C object, you must prefix your method with <code>@objc</code> in order to use it as a selector. <pre><code>@objc private func batteryLevelChanged(notification: NSNotification){ //do stuff using the userInfo property of the notification object } </code></pre> See <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSNotificationCenter_Class/" rel="noreferrer">NSNotificationCenter Class Reference</a>, <a href="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithObjective-CAPIs.html#//apple_ref/doc/uid/TP40014216-CH4-XID_36" rel="noreferrer">Interacting with Objective-C APIs</a>

9,614,109

How to calculate an angle from points?

I want to get a simple solution to calculate the angle of a line (like a pointer of a clock). I have 2 points: <pre><code>cX, cY - the center of the line. eX, eY - the end of the line. The result is angle (0 <= a < 360). </code></pre> Which function is able to provide this value?

9,614,122

5

2

null

2012-03-08 07:16:55.15 UTC

10

2018-11-13 14:37:36.443 UTC

2012-03-08 07:19:37.523 UTC

null

814,761

null

362,214

null

1

64

javascript|function|coordinates|angle

82,254

You want the arctangent: <pre><code>dy = ey - cy dx = ex - cx theta = arctan(dy/dx) theta *= 180/pi // rads to degs </code></pre> Erm, note that the above is obviously not compiling Javascript code. You'll have to look through documentation for the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atan" rel="noreferrer">arctangent</a> function. Edit: Using <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/atan2" rel="noreferrer">Math.atan2(y,x)</a> will handle all of the special cases and extra logic for you: <pre><code>function angle(cx, cy, ex, ey) { var dy = ey - cy; var dx = ex - cx; var theta = Math.atan2(dy, dx); // range (-PI, PI] theta *= 180 / Math.PI; // rads to degs, range (-180, 180] //if (theta < 0) theta = 360 + theta; // range [0, 360) return theta; } </code></pre>

9,224,056

Android Bitmap to Base64 String

How do I convert a large Bitmap (photo taken with the phone's camera) to a Base64 String?

9,224,180

7

2

null

2012-02-10 07:08:20.843 UTC

32

2020-02-20 12:01:21.193 UTC

2018-10-15 20:45:54.463 UTC

null

3,623,128

null

1,187,193

null

1

162

android|bitmap|base64|android-bitmap

144,538

use following method to convert bitmap to byte array: <pre><code>ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream); byte[] byteArray = byteArrayOutputStream .toByteArray(); </code></pre> to encode base64 from byte array use following method <pre><code>String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT); </code></pre>

16,437,872

fxml combobox, get the selected value into javafx

how can i catch the selected value of a fxml combobox and implement it into a javafx class? i gave the combobox the fx:id "sample" and created a button with onAction="#test" and tried .getValue and .getPromptText. <pre><code>@FXML private ComboBox<String> Sample; @FXML protected void test( ActionEvent event ) { String output = (String) Sample.getValue(); System.out.println(output); String output = (String) Sample.getPromptText(); System.out.println(output); } </code></pre> If i try to run it i get an error: <pre><code>java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1440) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28) at javafx.event.Event.fireEvent(Event.java:171) at javafx.scene.Node.fireEvent(Node.java:6863) at javafx.scene.control.Button.fire(Button.java:179) at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:193) at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:336) at com.sun.javafx.scene.control.skin.SkinBase$4.handle(SkinBase.java:329) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:64) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:53) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33) at javafx.event.Event.fireEvent(Event.java:171) at javafx.scene.Scene$MouseHandler.process(Scene.java:3324) at javafx.scene.Scene$MouseHandler.process(Scene.java:3164) at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3119) at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1559) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2261) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:228) at com.sun.glass.ui.View.handleMouseEvent(View.java:528) at com.sun.glass.ui.View.notifyMouse(View.java:922) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29) at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73) at java.lang.Thread.run(Thread.java:722) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1435) ... 45 more Caused by: java.lang.NullPointerException at TW_JAVAFX_Undecorator.ButtonController.pruefen(ButtonController.java:60) ... 50 more </code></pre> Thanks in advance Zombie

16,455,891

4

0

null

2013-05-08 10:04:55.727 UTC

1

2020-09-19 14:11:55.033 UTC

null

2,361,460

null

1

14

combobox|javafx|fxml

89,227

I think the code you have in your question should work as long as the case of the combobox identifier in the code matches that of your fxml <code>fx:id</code>. I modified this <a href="https://gist.github.com/jewelsea/3062859">JavaFX fxml combo box selection demonstration app</a> to add a button with an onAction method to retrieve a value from the combo box using the comboBox <code>getValue()</code> method and it worked fine for me. Check the case of things, I notice that you say the <code>fx:id</code> is <code>sample</code>, yet in your code you use <code>Sample</code> - and the cases must match otherwise the fxml loader won't inject the node into your controller correctly. Hard to say if the <code>NullPointerException</code> in your code is related to your combo box value retrieval issue as you don't say what the code at <code>TW_JAVAFX_Undecorator.ButtonController.pruefen(ButtonController.java:60)</code> is or provide full executable code to replicate the issue.

16,383,776

Detect in-app browser (WebView) with PHP / Javascript

I developed an app for iOS and Android which accesses an HTML file from my webserver using the in-app browser (Webview). I don't want that a user can access this file without using the app. Is there a possibility to detect, if the user is accessing the file with the app or directly via a browser on this smartphone / tablet / computer? I think that a solution with PHP is much better, because Javascript can be switched off. At least Google Analytics can differentiate between Safari and Safari (in-app). It should work with every version of iOS and Android. Thanks for your help. <hr> Solution After many attempts I finally found a working solution for me! iOS: You can detect the difference between Safari and the in-app browser using the user agent. Probably there's a nicer solution, but it works. <pre><code>// Safari (in-app) if ((strpos($_SERVER['HTTP_USER_AGENT'], 'Mobile/') !== false) && (strpos($_SERVER['HTTP_USER_AGENT'], 'Safari/') == false) { echo 'Safari (in-app)'; } </code></pre> Android: The package name from the app is stored in the PHP variable <code>$_SERVER['HTTP_X_REQUESTED_WITH']</code>. <pre><code>// Android (in-app) if($_SERVER['HTTP_X_REQUESTED_WITH'] == "com.company.app") { echo 'Android (in-app)'; } </code></pre> As Tim van Elsloo already noted HTTP headers can be faked and this is not absolutely secure.

16,383,808

3

2

null

2013-05-05 10:56:04.103 UTC

8

2020-02-18 17:41:43.463 UTC

2013-05-05 12:13:45.7 UTC

null

2,165,970

null

2,165,970

null

1

19

php|javascript|android|ios|xcode

33,615

I'm not sure about Android, but when you're using the iOS SDK's <code>UIWebView</code>, it sends the name and version of your app as part of the user agent (<code>YourApp/1.0</code>). You can then use PHP to check if your in-app webview is being used or not: <pre><code>if (strpos($_SERVER['HTTP_USER_AGENT'], 'YourApp/') !== false) </code></pre> I think Android does something similar as well.

16,310,588

How to clean completely select2 control?

I'm working with the awesome <a href="http://ivaynberg.github.io/select2/" rel="noreferrer">select2 control</a>. I'm trying to clean and disable the select2 with the content too so I do this: <pre><code>$("#select2id").empty(); $("#select2id").select2("disable"); </code></pre> Ok, it works, but if i had a value selected all the items are removed, the control is disabled, but the selected value is still displayed. I want to clear all content so the placeholder would be showed. Here is a example I did where you can see the issue: <a href="http://jsfiddle.net/BSEXM/" rel="noreferrer">http://jsfiddle.net/BSEXM/</a> HTML: <pre><code><select id="sel" data-placeholder="This is my placeholder"> <option></option> <option value="a">hello</option> <option value="b">all</option> <option value="c">stack</option> <option value="c">overflow</option> </select> <button id="pres">Disable and clear</button> <button id="ena">Enable</button> </code></pre> Code: <pre><code>$(document).ready(function () { $("#sel").select2(); $("#pres").click(function () { $("#sel").empty(); $("#sel").select2("disable"); }); $("#ena").click(function () { $("#sel").select2("enable"); }); }); </code></pre> CSS: <pre><code>#sel { margin: 20px; } </code></pre> Do you have any idea or advice to this?

19,546,463

11

1

null

2013-04-30 23:31:16.74 UTC

5

2022-05-24 07:58:56.653 UTC

2018-03-01 20:23:52.58 UTC

null

5,731,992

null

1,709,738

null

1

51

javascript|jquery|jquery-ui|jquery-select2

92,924

Why all this trouble??? use: <pre><code> $('#sel').select2('data', null); </code></pre>

16,149,803

Working with big data in python and numpy, not enough ram, how to save partial results on disc?

I am trying to implement algorithms for 1000-dimensional data with 200k+ datapoints in python. I want to use numpy, scipy, sklearn, networkx, and other useful libraries. I want to perform operations such as pairwise distance between all of the points and do clustering on all of the points. I have implemented working algorithms that perform what I want with reasonable complexity but when I try to scale them to all of my data I run out of RAM. Of course, I do, creating the matrix for pairwise distances on 200k+ data takes a lot of memory. Here comes the catch: I would really like to do this on crappy computers with low amounts of RAM. Is there a feasible way for me to make this work without the constraints of low RAM? That it will take a much longer time is really not a problem, as long as the time reqs don't go to infinity! I would like to be able to put my algorithms to work and then come back an hour or five later and not have it stuck because it ran out of RAM! I would like to implement this in python, and be able to use the numpy, scipy, sklearn, and networkx libraries. I would like to be able to calculate the pairwise distance to all my points etc Is this feasible? And how would I go about it, what can I start to read up on?

16,633,274

1

3

null

2013-04-22 14:36:25.78 UTC

39

2021-07-20 16:22:28 UTC

null

2,452,869

null

1,469,829

null

1

67

python|arrays|numpy|scipy|bigdata

40,374

Using <code>numpy.memmap</code> you create arrays directly mapped into a file: <pre><code>import numpy a = numpy.memmap('test.mymemmap', dtype='float32', mode='w+', shape=(200000,1000)) # here you will see a 762MB file created in your working directory </code></pre> You can treat it as a conventional array: a += 1000. It is possible even to assign more arrays to the same file, controlling it from mutually sources if needed. But I've experiences some tricky things here. To open the full array you have to "close" the previous one first, using <code>del</code>: <pre><code>del a b = numpy.memmap('test.mymemmap', dtype='float32', mode='r+', shape=(200000,1000)) </code></pre> But openning only some part of the array makes it possible to achieve the simultaneous control: <pre><code>b = numpy.memmap('test.mymemmap', dtype='float32', mode='r+', shape=(2,1000)) b[1,5] = 123456. print a[1,5] #123456.0 </code></pre> Great! <code>a</code> was changed together with <code>b</code>. And the changes are already written on disk. The other important thing worth commenting is the <code>offset</code>. Suppose you want to take not the first 2 lines in <code>b</code>, but lines 150000 and 150001. <pre><code>b = numpy.memmap('test.mymemmap', dtype='float32', mode='r+', shape=(2,1000), offset=150000*1000*32/8) b[1,2] = 999999. print a[150001,2] #999999.0 </code></pre> Now you can access and update any part of the array in simultaneous operations. Note the byte-size going in the offset calculation. So for a 'float64' this example would be 150000*1000*64/8. Other references: <ul> <li><a href="https://stackoverflow.com/a/16597695/832621">Is it possible to map a discontiuous data on disk to an array with python?</a></li> <li><a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.memmap.html#numpy.memmap" rel="noreferrer"><code>numpy.memmap</code> documentation here</a>.</li> </ul>

16,195,871

How do I see the current encoding of a file in Sublime Text?

How do I see the current encoding of a file in Sublime Text? This seems like a pretty simple thing to do but searching has not yielded much. Any pointers would be appreciated!

20,657,899

6

1

null

2013-04-24 15:20:41.08 UTC

70

2018-05-30 04:01:53.773 UTC

2018-01-30 19:36:16.19 UTC

null

1,787,434

null

583,834

null

1

372

encoding|sublimetext2

238,869

Since this thread is a popular result in google search, here is the way to do it for sublime text 3 build 3059+: in user preferences, add the line: <pre><code>"show_encoding": true </code></pre>

16,522,111

Python syntax for "if a or b or c but not all of them"

I have a python script that can receive either zero or three command line arguments. (Either it runs on default behavior or needs all three values specified.) What's the ideal syntax for something like: <pre><code>if a and (not b or not c) or b and (not a or not c) or c and (not b or not a): </code></pre> ?

16,522,194

15

9

null

2013-05-13 12:30:20.82 UTC

28

2022-02-25 02:58:07.867 UTC

2015-09-07 01:35:40.06 UTC

null

1,832,942

null

1,779,735

null

1

142

python|if-statement

267,048

If you mean a minimal form, go with this: <pre><code>if (not a or not b or not c) and (a or b or c): </code></pre> Which translates the title of your question. UPDATE: as correctly said by Volatility and Supr, you can apply De Morgan's law and obtain equivalent: <pre><code>if (a or b or c) and not (a and b and c): </code></pre> My advice is to use whichever form is more significant to you and to other programmers. The first means "there is something false, but also something true", the second "There is something true, but not everything". If I were to optimize or do this in hardware, I would choose the second, here just choose the most readable (also taking in consideration the conditions you will be testing and their names). I picked the first.

16,244,969

How to tell git to ignore individual lines, i.e. gitignore for specific lines of code

<code>.gitignore</code> can ignore whole files, but is there a way to ignore specific lines of code while coding? I frequently and repeatedly add the same debug lines in a project, only to have to remember to remove them before committing. I'd like to just keep the lines in the code and have git disregard them.

16,244,970

2

8

null

2013-04-26 20:47:17.183 UTC

88

2020-05-20 07:32:38.337 UTC

null

234,593

null

1

229

git|gitignore|ignore

85,560

This is how you can kind of do it with <a href="https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html#_tt_filter_tt" rel="noreferrer">git filters</a>: <ol> <li>Create/Open gitattributes file: <ul> <li><code><project root>/.gitattributes</code> (will be committed into repo) OR</li> <li><code><project root>/.git/info/attributes</code> (won't be committed into repo)</li> </ul></li> <li>Add a line defining the files to be filtered: <ul> <li><code>*.rb filter=gitignore</code>, i.e. run filter named <code>gitignore</code> on all <code>*.rb</code> files</li> </ul></li> <li>Define the <code>gitignore</code> filter in your <code>gitconfig</code>: <ul> <li><code>$ git config --global filter.gitignore.clean "sed '/#gitignore$/d'"</code>, i.e. delete these lines</li> <li><code>$ git config --global filter.gitignore.smudge cat</code>, i.e. do nothing when pulling file from repo</li> </ul></li> </ol> Notes: Of course, this is for ruby files, applied when a line ends with <code>#gitignore</code>, applied globally in <code>~/.gitconfig</code>. Modify this however you need for your purposes. Warning!! This leaves your working file different from the repo (of course). Any checking out or rebasing will mean these lines will be lost! This trick may seem useless since these lines are repeatedly lost on check out, rebase, or pull, but I've a specific use case in order to make use of it. Just <code>git stash save "proj1-debug"</code> while the filter is inactive (just temporarily disable it in <code>gitconfig</code> or something). This way, my debug code can always be <code>git stash apply</code>'d to my code at any time without fear of these lines ever being accidentally committed. I have a possible idea for dealing with these problems, but I'll try implementing it some other time. Thanks to Rudi and jw013 for mentioning git filters and gitattributes.

15,392,423

java.lang.IllegalStateException on response.SendRedirect("Location")

I am a beginner in the world of Java EE. I have been trying to create a simple login System using Servlets and JSP following the guide provided here <a href="http://come2niks.com/?p=1589" rel="noreferrer">http://come2niks.com/?p=1589</a>. This is how my doPost() look like. <pre><code>@Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter(); processRequest(request, response); try { System.out.println("In the Login Servlet"); LoginBean user = new LoginBean(); user.setUserName(request.getParameter("username")); user.setPassword(request.getParameter("pass")); LoginDAO db = new LoginDAO(); user = db.login(user); System.err.println("I am Back !"); if(user.isValid()) { System.err.println("VALIDED.. ReDirecting.."); System.err.println("Getting Session"); HttpSession session = request.getSession(true); System.err.println("Got Session"); session.setAttribute("currentSessionUser",user); System.err.println("Attribute Set"); response.sendRedirect("Login_Success.jsp"); }else { System.err.println(" NOT VALIDED.. ReDirecting.."); response.sendRedirect("Login_Failed.jsp"); out.println(" NOT VALIDED.. ReDirecting.."); } } catch (Throwable exc) { System.out.println(exc); } } </code></pre> I have added some System.err to get some more info on the flow of the code. This is what my glassfish says <pre><code>INFO: In the Login Servlet INFO: Driver loaded! INFO: Database connected! INFO: Welcome Ramesh SEVERE: I am Back ! SEVERE: VALIDED.. ReDirecting.. SEVERE: Getting Session SEVERE: Got Session SEVERE: Attribute Set INFO: java.lang.IllegalStateException at org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:524) at groovers.LoginServlet.doPost(LoginServlet.java:100) at javax.servlet.http.HttpServlet.service(HttpServlet.java:688) at javax.servlet.http.HttpServlet.service(HttpServlet.java:770) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:722) </code></pre> Please help me solve this problem.

15,392,646

3

2

null

2013-03-13 17:34:05.203 UTC

2

2013-03-17 09:09:08.947 UTC

null

472,792

null

1,306,343

null

1

6

jakarta-ee|servlets

57,915

I think before you call <code>sendRedirect()</code> the response is getting committed. It means the server has already flush the headers to the client. This will usually happen when either the response buffer has reached max size or someone has called flush() explicitly. Since the response is already committed you cannot add any more headers. And because <code>sendRedirect()</code> requires <code>Location</code> header to be added to the response. The server will throw <code>IllegalSateException</code> exception. How to Fix it? Make sure you are not writing any data before you do <code>sendRedirect()</code>. In your code, i suspect <code>processRequest()</code> method is writing to the response. Please find here why the Response will get committed. <a href="https://stackoverflow.com/questions/11305563/cause-of-servlets-response-already-committed">Cause of Servlet's 'Response Already Committed'</a>

22,238,368

How can I require at least one checkbox be checked before a form can be submitted?

I have a list of multiple check boxes. The user can check all of them, but at least one should be checked to allow form submission. How can I enforce that requirement? <pre><code>Box Set 1 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 1" required><label>Box 1</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 2" required><label>Box 2</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 3" required><label>Box 3</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 4" required><label>Box 4</label></li> </ul> Box Set 2 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 5" required><label>Box 5</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 6" required><label>Box 6</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 7" required><label>Box 7</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 8" required><label>Box 8</label></li> </ul> Box Set 3 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 9" required><label>Box 9</label></li> </ul> Box Set 4 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 10" required><label>Box 10</label></li> </ul> </code></pre>

22,238,811

11

2

null

2014-03-06 23:27:03.72 UTC

11

2022-06-14 11:20:13.85 UTC

2019-10-28 19:59:54.69 UTC

null

2,756,409

null

2,110,210

null

1

49

html|css|validation|checkbox

168,641

Here's an example using jquery and your html. <pre><code><html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script> </head> <body> <script type="text/javascript"> $(document).ready(function () { $('#checkBtn').click(function() { checked = $("input[type=checkbox]:checked").length; if(!checked) { alert("You must check at least one checkbox."); return false; } }); }); </script> Box Set 1 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 1" required><label>Box 1</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 2" required><label>Box 2</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 3" required><label>Box 3</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 4" required><label>Box 4</label></li> </ul> Box Set 2 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 5" required><label>Box 5</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 6" required><label>Box 6</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 7" required><label>Box 7</label></li> <li><input name="BoxSelect[]" type="checkbox" value="Box 8" required><label>Box 8</label></li> </ul> Box Set 3 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 9" required><label>Box 9</label></li> </ul> Box Set 4 <ul> <li><input name="BoxSelect[]" type="checkbox" value="Box 10" required><label>Box 10</label></li> </ul> <input type="button" value="Test Required" id="checkBtn"> </body> </html> </code></pre>

21,708,339

Avoid Jackson serialization on non fetched lazy objects

I have a simple controller that return a User object, this user have a attribute coordinates that have the hibernate property FetchType.LAZY. When I try to get this user, I always have to load all the coordinates to get the user object, otherwise when Jackson try to serialize the User throws the exception: <blockquote> com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session </blockquote> This is due to Jackson is trying to fetch this unfetched object. Here are the objects: <pre><code>public class User{ @OneToMany(fetch = FetchType.LAZY, mappedBy = "user") @JsonManagedReference("user-coordinate") private List<Coordinate> coordinates; } public class Coordinate { @ManyToOne @JoinColumn(name = "user_id", nullable = false) @JsonBackReference("user-coordinate") private User user; } </code></pre> And the controller: <pre><code>@RequestMapping(value = "/user/{username}", method=RequestMethod.GET) public @ResponseBody User getUser(@PathVariable String username) { User user = userService.getUser(username); return user; } </code></pre> There is a way to tell Jackson to not serialize the unfetched objects? I've been looking other answers posted 3 years ago implementing jackson-hibernate-module. But probably it could be achieved with a new jackson feature. My versions are: <ul> <li>Spring 3.2.5 </li> <li>Hibernate 4.1.7 </li> <li>Jackson 2.2</li> </ul> Thanks in advance.

21,760,361

15

6

null

2014-02-11 17:07:14.193 UTC

62

2021-05-27 16:48:57.387 UTC

2016-05-11 14:59:38.367 UTC

null

1,426,227

null

1,416,034

null

1

93

java|spring|hibernate|serialization|jackson

89,786

I finally found the solution! thanks to indybee for giving me a clue. The tutorial <a href="http://blog.pastelstudios.com/2012/03/12/spring-3-1-hibernate-4-jackson-module-hibernate/">Spring 3.1, Hibernate 4 and Jackson-Module-Hibernate</a> have a good solution for Spring 3.1 and earlier versions. But since version 3.1.2 Spring have his own MappingJackson2HttpMessageConverter with almost the same functionality as the one in the tutorial, so we don't need to create this custom HTTPMessageConverter. With javaconfig we don't need to create a HibernateAwareObjectMapper too, we just need to add the Hibernate4Module to the default MappingJackson2HttpMessageConverter that Spring already have and add it to the HttpMessageConverters of the application, so we need to: <ol> <li>Extend our spring config class from WebMvcConfigurerAdapter and override the method configureMessageConverters. </li> <li>On that method add the MappingJackson2HttpMessageConverter with the Hibernate4Module registered in a previus method.</li> </ol> Our config class should look like this: <pre><code>@Configuration @EnableWebMvc public class MyConfigClass extends WebMvcConfigurerAdapter{ //More configuration.... /* Here we register the Hibernate4Module into an ObjectMapper, then set this custom-configured ObjectMapper * to the MessageConverter and return it to be added to the HttpMessageConverters of our application*/ public MappingJackson2HttpMessageConverter jacksonMessageConverter(){ MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter(); ObjectMapper mapper = new ObjectMapper(); //Registering Hibernate4Module to support lazy objects mapper.registerModule(new Hibernate4Module()); messageConverter.setObjectMapper(mapper); return messageConverter; } @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { //Here we add our custom-configured HttpMessageConverter converters.add(jacksonMessageConverter()); super.configureMessageConverters(converters); } //More configuration.... } </code></pre> If you have an xml configuration, you don't need to create your own MappingJackson2HttpMessageConverter either, but you do need to create the personalized mapper that appears in the tutorial (HibernateAwareObjectMapper), so your xml config should look like this: <pre><code><mvc:message-converters> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="objectMapper"> <bean class="com.pastelstudios.json.HibernateAwareObjectMapper" /> </property> </bean> </mvc:message-converters> </code></pre> Hope this answer be understandable and helps someone find the solution for this problem, any questions feel free to ask!

17,620,405

The annotation @Index is disallowed for this location

When trying to use the <code>@Index</code> annotation from <code>javax.persistence</code>, Eclipse gives me this error. I'm using it right before a <code>java.util.Date</code> field, inside a class annotated with <code>@Entity</code>. Before, I was using <code>org.hibernate.annotations.Index</code> in the exact same place and it was fine. The problem started after I've upgraded hibernate-core from 4.1.9.Final to 4.3.0.Beta3 and hibernate-commons-annotations from 4.0.1 to 4.0.2. It says <code>@Index</code> is deprecated and recommends the <code>javax.persistence</code> one. All docs and examples I've found put <code>@Index</code> before class members. What am I missing?

17,620,465

3

0

null

2013-07-12 17:12:25.38 UTC

4

2017-11-13 09:02:32.93 UTC

null

4,813,586

null

2,004,857

null

1

30

java|jpa|hibernate-annotations

23,481

The JPA Index annotation can only be used as part of another annotation like <code>@Table</code>, <code>@SecondaryTable</code>, etc. (see the See Also section in the <a href="http://docs.oracle.com/javaee/7/api/javax/persistence/Index.html" rel="noreferrer">javadoc</a>): <pre><code>@Table(indexes = { @Index(...) }) </code></pre>

18,321,244

Is C++11 atomic<T> usable with mmap?

I want to add network control of a handful of parameters used by a service (daemon) running on a Linux embedded system. There's no need for procedure calls, each parameter can be polled in a very natural way. Shared memory seems a nice way to keep networking code out of the daemon, and limit shared access to a carefully controlled set of variables. Since I don't want partial writes to cause visibility of values never written, I was thinking of using <code>std::atomic<bool></code> and <code>std::atomic<int></code>. However, I'm worried that <code>std::atomic<T></code> might be implemented in a way that only works with C++11 threads and not with multiple processes (potentially, not even with OS threads). Specifically, if the implementation uses any data structures stored outside the shared memory block, in a multi-process scenario this would fail. I do see some requirements which suggest to be that <code>std::atomic</code> won't hold an embedded lock object or pointer to additional data: <blockquote> The atomic integral specializations and the specialization <code>atomic<bool></code> shall have standard layout. They shall each have a trivial default constructor and a trivial destructor. They shall each support aggregate initialization syntax. There shall be pointer partial specializations of the atomic class template. These specializations shall have standard layout, trivial default constructors, and trivial destructors. They shall each support aggregate initialization syntax. </blockquote> Trivial default construction and destruction seems to me to exclude associated per-object data, whether stored inside the object, via a pointer member variable, or via an external mapping. However, I see nothing that excludes an implementation from using a single global mutex / critical section (or even a global collection, as long as the collection elements aren't associated with individual atomic objects -- something along the lines of a cache association scheme could be used to reduce false conflicts). Obviously, access from multiple processes would fail on an implementation using a global mutex, because the users would have independent mutexes and not actually synchronize with each other. Is an implementation of <code>atomic<T></code> allowed to do things that are incompatible with inter-process shared memory, or are there other rules that make it safe? <hr /> I just noticed that trivial default construction leaves the object in a not-ready state, and a call to <code>atomic_init</code> is required. And the Standard mentions initialization of locks. If these are stored inside the object (and dynamic memory allocation seems impossible, since the destructor remains trivial) then they would be shared between processes. But I'm still concerned about the possibility of a global mutex. In any case, guaranteeing a single call to <code>atomic_init</code> for each variable in a shared region seems difficult... so I suppose I'll have to steer away from the C++11 atomic types.

19,937,333

2

8

null

2013-08-19 19:07:47.19 UTC

15

2013-11-12 18:41:27.567 UTC

2020-06-20 09:12:55.06 UTC

null

-1

null

103,167

null

1

34

c++|multithreading|c++11|shared-memory|atomic

6,893

I'm two months late, but I'm having the exact same problem right now and I think I've found some sort of an answer. The short version is that it should work, but I'm not sure if I'd depend on it. Here's what I found: <ul> <li>The C++11 standard defines a new memory model, but it has no notion of OS-level "process", so anything multiprocessing-related is non-standard.</li> <li>However, section 29.4 "Lock-free property" of the standard (or at least the draft I have, N3337) ends with this note: <blockquote> [ Note: Operations that are lock-free should also be address-free. That is, atomic operations on the same memory location via two different addresses will communicate atomically. The implementation should not depend on any per-process state. This restriction enables communication by memory that is mapped into a process more than once and by memory that is shared between two processes. — end note ] </blockquote> This sounds very promising. :)</li> <li>That note appears to come from <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">N2427</a>, which is even more explicit: <blockquote> To facilitate inter-process communication via shared memory, it is our intent that lock-free operations also be address-free. That is, atomic operations on the same memory location via two different addresses will communicate atomically. The implementation shall not depend on any per-process state. While such a definition is beyond the scope of the standard, a clear statement of our intent will enable a portable expression of class of a programs already extant. </blockquote> So it appears that yes, all lock-free operations are supposed to work in this exact scenario.</li> <li>Now, operations on <code>std::atomic<type></code> are atomic but they may or may not be lock-free for particular <code>type</code>, depending on capabilities of the platform. And We can check any variable <code>x</code> by calling <code>x.is_lock_free()</code>.</li> <li>So why did I write that I would not depend on this? I can't find any kind of documentation for gcc, llvm or anyone else that's explicit about this.</li> </ul>

23,430,395

Glob search files in date order?

I have this line of code in my python script. It searches all the files in in a particular directory for * cycle *.log. <pre><code>for searchedfile in glob.glob("*cycle*.log"): </code></pre> This works perfectly, however when I run my script to a network location it does not search them in order and instead searches randomly. Is there a way to force the code to search by date order? This question has been asked for php but I am not sure of the differences. Thanks

23,430,865

6

4

null

2014-05-02 14:21:18.977 UTC

10

2018-03-25 13:05:34.41 UTC

null

3,524,351

null

1

42

python|date|search|glob

52,607

To sort files by date: <pre><code>import glob import os files = glob.glob("*cycle*.log") files.sort(key=os.path.getmtime) print("\n".join(files)) </code></pre> See also <a href="https://docs.python.org/3/howto/sorting.html">Sorting HOW TO</a>.

23,420,795

Why would a button click event cause site to reload in a Bootstrap form?

I'm using jQuery's <code>show()</code> and <code>hide()</code> functions on <code>divs</code> in order to code or simulate different consecutive form sections. I've made a button that hides a <code>div</code> when it's clicked. What's strange is that once the button is clicked, the page will reload and come back to the div shown at first <code>$(document).ready()</code>. What's even more strange is that this problem mentioned above won't happen if you click in the nav bar text before clicking in the "continuar" button (Then the expected page will appear without reloading and showing the first page again). The form can be visited here: <blockquote> <code>http://registropsicologos.maricelaaguilarflores.com:20791</code> </blockquote> The blue button is the responsible for the page reload problem, unless you click Visualizar at nav bar before clicking in "continuar". I can't understand why this is happening, I've used <code>.show()</code> and <code>.hide()</code> before and this problem wasn't happening. Here's the relevant JavaScript code: <pre><code>$(document).ready(function () { mostrarFormularioRegistro() $(".btnSeccion").click(function() { btnMostrarSeccion($(this)) }) }) function mostrarFormularioRegistro () { $("#formularioRegistro").show() mostrarSeccion(1) $("#DB").hide() } function mostrarSeccion (seccion) { for (var i = 1; i <4; i++) { if (i===seccion) $("#seccionRegistro"+i).show() else $("#seccionRegistro"+i).hide() } } function btnMostrarSeccion (idBtnSeccion) { var seccion = parseInt(idBtnSeccion.attr("id").slice(-1)) if (seccion == 3) mostrarSeccion(1) else mostrarSeccion(seccion+1) } </code></pre> This is the body markup: <pre><code><body> <div class="container" id="proyecto"> <ul class="nav nav-tabs"> <li class="active"><a href="#">Registrar</a></li> <li><a href="#">Visualizar</a></li> </ul> </div> <div id="formulario"> <div class="container" id="seccionRegistro1"> <form class="form-horizontal" role="form"> <div class="form-group"> <label for="inputNombre" class="col-sm-2 control-label">Nombre(s)</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputNombre" placeholder="Nombre(s)"> </div> </div> <div class="form-group"> <label for="inputApellidos" class="col-sm-2 control-label">Apellidos</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputApellidos" placeholder="Apellidos"> </div> </div> <div class="form-group"> <label for="inputEdad" class="col-sm-2 control-label">Edad</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputEdad" placeholder="Apellidos"> </div> </div> <div class="form-group"> <label for="inputTel" class="col-sm-2 control-label">Teléfono</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputTel" placeholder="Teléfono"> </div> </div> <div class="form-group"> <label for="inputCel" class="col-sm-2 control-label">Celular</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputCel" placeholder="Celular"> </div> </div> <div class="col-sm-offset-2 col-sm-10"> <button class="btn btn-primary btnSeccion" id="btnSeccion1">Continuar</button> </div> </form> </div> <div class="container" id="seccionRegistro2"> <form class="form-horizontal" role="form"> <div class="form-group"> <label for="inputEscolaridad" class="col-sm-2 control-label">Escolaridad</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputEscolaridad" placeholder="Escolaridad"> </div> </div> <div class="form-group"> <label for="inputAlmaMater" class="col-sm-2 control-label">Egresado de</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputAlmaMater" placeholder="Egresado de"> </div> </div> <div class="form-group"> <label for="inputAñoEgreso" class="col-sm-2 control-label">Año de egreso</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputAñoEgreso" placeholder="Año de egreso"> </div> </div> <div class="form-group"> <label for="inputCedula" class="col-sm-2 control-label">Cédula Profesional</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputCedula" placeholder="Cédula Profesional"> </div> </div> <div class="form-group"> <label for="checkPosgrado" class="col-sm-2 control-label">Estudios de Posgrado</label> <div class="col-sm-1"> <div class="checkbox"> <label> <input type="checkbox"> Sí </label> </div> </div> <div class="col-sm-8"> <div class="row"> <div class="col-xs-4"> <input type="text" class="form-control" placeholder="Posgrado" id="inputPosgrado1"> </div> <div class="col-xs-4"> <input type="text" class="form-control" placeholder="Posgrado" id="inputPosgrado2"> </div> <div class="col-xs-4"> <input type="text" class="form-control" placeholder="Posgrado" id="inputPosgrado3"> </div> </div> </div> </div> <div class="form-group"> <label for="inputCedula" class="col-sm-2 control-label">Cédula Profesional</label> <div class="col-sm-10"> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoClinica" value="option1"> Clínica </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoSocial" value="option1"> Social </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoLaboral" value="option1"> Laboral </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoEducativa" value="option1"> Educativa </label> </div> </div> <div class="form-group"> <label for="inputTrabajo" class="col-sm-2 control-label">Institución de trabajo</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputTrabajo" placeholder="Institución de trabajo"> </div> </div> <div class="form-group"> <label for="trabajoIndependiente" class="col-sm-2 control-label">Desarrollo Profesional Independiente</label> <div class="col-sm-1"> <div class="checkbox"> <label> <input type="checkbox" id="trabajoIndependiente"> Sí </label> </div> </div> <div class="col-sm-8"> <div class="row"> <div class="col-xs-6"> <input type="text" class="form-control" placeholder="Actividad independiente" id="inputActividadIndependiente1" disabled="true"> </div> <div class="col-xs-6"> <input type="text" class="form-control" placeholder="Actividad independiente" id="inputActividadIndependiente2" disabled="true"> </div> </div> </div> </div> <div class="form-group"> <label for="checkPosgrado" class="col-sm-2 control-label">Actividades de trabajo no relacionadas con la psicología</label> <div class="col-sm-1"> <div class="checkbox"> <label> <input type="checkbox" id="actividadesAjenasPsicologia"> Sí </label> </div> </div> <div class="col-sm-8"> <div class="row"> <div class="col-xs-6"> <input type="text" class="form-control" placeholder="Actividad" id="actividadNoPsicologia1" disabled="true"> </div> <div class="col-xs-6"> <input type="text" class="form-control" placeholder="Actividad" id="actividadNoPsicologia2" disabled="true"> </div> </div> </div> </div> <div class="col-sm-offset-2 col-sm-10"> <button class="btn btn-primary btnSeccion" id="btnSeccion2">Continuar</button> </div> </form> </div> <div class="container" id="seccionRegistro3"> <form class="form-horizontal" role="form"> <div class="form-group"> <label for="actividadesInteres" class="col-sm-2 control-label">Actvidades profesionales en las que le gustaría participar</label> <div class="col-sm-10"> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoClinica" value="option1"> Conferencias y encuentros </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoSocial" value="option1"> Cursos </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoLaboral" value="option1"> Talleres </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoEducativa" value="option1"> Diplomados </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoEducativa" value="option1"> Maestría </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoEducativa" value="option1"> Doctorado </label> </div> </div> <div class="form-group"> <label for="capacitacionInteres" class="col-sm-2 control-label">Areas de la psicología en las que le gustaría capacitarse</label> <div class="col-sm-10"> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoClinica" value="Clínica"> Clínica </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoSocial" value="Social"> Social </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoLaboral" value="Laboral"> Laboral </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoEducativa" value="Educativa"> Educativa </label> <label class="checkbox-inline"> <input type="checkbox" id="inputAreaTrabajoEducativa" value="Todas"> Todas </label> </div> </div> <div class="form-group"> <label for="inputNombre" class="col-sm-2 control-label">¿Alguna temática en particular que le gustaría conocer o capacitarse?</label> <div class="col-sm-10"> <input type="text" class="form-control" id="inputInteresCapacitacion" placeholder="Temática de interés"> </div> </div> <div class="form-group"> <label for="checkPosgrado" class="col-sm-2 control-label">¿Pertenece a alguna agrupación relacionada con el campo de la psicología?</label> <div class="col-sm-1"> <div class="checkbox"> <label> <input type="checkbox" id="actividadesAjenasPsicologia"> Sí </label> </div> </div> <div class="col-sm-8"> <div class="row"> <div class="col-xs-6"> <input type="text" class="form-control" placeholder="Actividad" id="Agrupación" disabled="true"> </div> <div class="col-xs-6"> <input type="text" class="form-control" placeholder="Actividad" id="Agrupación" disabled="true"> </div> </div> </div> </div> <div class="form-group"> <label for="checkPosgrado" class="col-sm-2 control-label">¿Ha participado con anterioridad en algún evento de la Asociación de Psicólogos de Tuxtepec?</label> <div class="col-sm-1"> <div class="checkbox"> <label> <input type="checkbox" id="participacionEventos"> Sí </label> </div> </div> <div class="col-sm-8"> <select multiple class="form-control" id="eventosAsistidos"> <option value="abrazoterapia">Abrazoterapia</option> <option value="tallerMujeres">Taller autoestima mujeres</option> </select> </div> </div> ¿Le gustaría pertenecer como miembro activo de la Asociación de Psicólogos de Tuxtepec, A.C. "Manos Unidas por un vivir más pleno?" &nbsp;&nbsp;&nbsp;&nbsp; <label> <input type="checkbox" id="idInteresMiembro">Sí </label> <div class="col-sm-offset-2 col-sm-10"> <button class="btn btn-primary btnSeccion" id="btnSeccion3">Continuar</button> </div> </form> </div> </div> </body> </code></pre>

23,420,958

8

4

null

2014-05-02 04:33:56.86 UTC

4

2021-05-06 16:51:23.963 UTC

2014-05-02 05:03:42.013 UTC

null

742,560

null

742,560

null

1

36

javascript|jquery|html

40,129

A <code><button></code> tag uses Submit behavior by default. Thus your page submits the form when the button is clicked and this looks like a page refresh itself. To work around this you can either use an <code>input</code> tag <pre><code><input type="button" class="btn btn-primary btnSeccion" id="btnSeccion3" value="Continuar"/> </code></pre> to do the same effect. Or you can cancel the Submit in your button's click Event Handler (if that's what you want) like this: <pre><code>$(".btnSeccion").click(function(event) { btnMostrarSeccion($(this)); event.preventDefault(); }) </code></pre>

43,224,012

.NET Core SDK versions - which to uninstall?

I have the following versions of .NET Core SDKs installed on my machine: <a href="https://i.stack.imgur.com/kPQYJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/kPQYJ.png" alt="enter image description here"></a> <a href="https://i.stack.imgur.com/BxJn0.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BxJn0.png" alt="enter image description here"></a> Please confirm that I understand what each of these is (and if I can uninstall them): .NET Core SDK 1.0.0 (x64) Installer (x64): This was installed along with VS2017 .NET Core SDK 1.0.1 (x64): Downloaded somewhere <a href="https://www.microsoft.com/net/core" rel="noreferrer">here</a> and installed manually. Exactly the same as the 1.0.0 SDK above except that it <a href="https://github.com/dotnet/core/blob/master/release-notes/1.1/1.1.1.md" rel="noreferrer">includes support for Fedora 24 and OpenSUSE 42.1</a>. So as a Windows user, can I uninstall this? The other four Microsoft .NET Core 1.x.x SDKs are various versions of the VS2015 (and project.json) preview tooling and can thus be uninstalled?

43,225,707

4

3

null

2017-04-05 07:00:03.747 UTC

7

2021-12-14 11:43:27.62 UTC

null

589,558

null

1

31

asp.net-core|.net-core

26,549

First of all, this is the page I find the most useful to understand the complicated versioning of .NET CORE: <a href="https://github.com/dotnet/core/blob/master/release-notes/download-archive.md" rel="noreferrer">https://github.com/dotnet/core/blob/master/release-notes/download-archive.md</a> Then, something that you might already know but that was unclear to me at some point: there is a different versioning between runtimes and SDK and it's sometime complicated to follow. When you install some SDKs it's coming with associated runtimes, for instance .NET CORE SDK 1.0.1 comes with the runtime FTS 1.1.1 and LTS 1.0.4 ... to see that, the creation date of folders installed here can be informative: 'C:\Program Files\dotnet\sdk' for the SDK and 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App' for the runtimes. So, let me tell you what I think of your statement. <blockquote> .NET Core SDK 1.0.0 (x64) Installer (x64): This was installed along with VS2017 </blockquote> Agreed. It corresponds to the ".NET Core SDK 1.0.0 and 1.0.1" part of <a href="https://github.com/dotnet/core/blob/master/release-notes/1.0/1.0.4.md" rel="noreferrer">https://github.com/dotnet/core/blob/master/release-notes/1.0/1.0.4.md</a>. <blockquote> .NET Core SDK 1.0.1 (x64): Downloaded somewhere here and installed manually. Exactly the same as the 1.0.0 SDK above except that it includes support for Fedora 24 and OpenSUSE 42.1. So as a Windows user, can I uninstall this? </blockquote> Agreed, as stated on the same link as above. My concern is that if you uninstall that you might end up uninstalling the associated runtimes: FTS 1.1.1 and LTS 1.0.4. On my machine, those have been installed at the same date as this SDK and haven't been reinstalled with VS2017 so I'm not sure how the uninstaller would behave. <blockquote> The other four Microsoft .NET Core 1.x.x SDKs are various versions of the VS2015 (and project.json) preview tooling and can thus be uninstalled? </blockquote> Visual Studio 2015 is compatible with all SDKs up to preview 2.X based on project.json, preview 3 and upward removed the .json support and moved to .csproj, only compatible with Visual 2017. So if you are only using VS2017 and the latest runtimes 1.0.4/1.1.1 you can safely removed all those. Just make sure that your project is not targeting a particular runtime that you would be removing doing so, see the <code>frameworks</code> of <a href="https://docs.microsoft.com/en-us/dotnet/articles/core/tools/project-json-to-csproj" rel="noreferrer">https://docs.microsoft.com/en-us/dotnet/articles/core/tools/project-json-to-csproj</a> A generic comment: .NET CORE is supposed to be portable, so its deployement is supposed to be very easy, you don't really have to install it, just copy the proper folder and then set the right env variables and it should be working, it is not deeply modofying your env (no registry entries, no registration of tons of components ...) so you should be able to install / uninstall and test it quite safely. At least, that's my understanding of what MS is trying to do.

43,074,144

Vue.js Input field loses its focus after entry of one character

I have a view with an input field, which can be multiplicated by a given button. The problem is that after any entry of a char, the focus of the input field is lost. You have to click again to enter another char. Do someone have a clue what could be the problem? My model: <pre><code>'model': [ ..., 'filter': [ ..., 'something': [ 'string' ] ] ] </code></pre> My code: <pre><code><div v-for="(something, index) in model.filter.something" v-bind:key="something"> <input type="text" v-model.trim="model.filter.something[index]"/> </div> </code></pre>

43,095,557

1

4

null

2017-03-28 15:47:55.38 UTC

8

2017-03-31 13:28:25.93 UTC

null

3,219,606

null

5,436,452

null

1

40

javascript|focus|vue.js

14,799

The problem is that you are using a changing value as <code>key</code>. Vue expects <code>key</code> to indicate a unique identifier for the item. When you change it, it becomes a new item and must be re-rendered. In the snippet below, I have two loops, both using the same data source. The first is keyed the way you have it set up. The second uses <code>index</code> instead (that may not be what you need, but the point is to use something other than what you're editing; in this example, <code>key</code> isn't needed anyway). The first exhibits the loss-of-focus you describe, the second works as expected. <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>new Vue({ el: '#app', data: { 'model': { 'filter': { 'something': [ 'string' ] } } } });</code></pre> <pre class="snippet-code-html lang-html prettyprint-override"><code><script src="//cdnjs.cloudflare.com/ajax/libs/vue/2.2.6/vue.min.js"></script> <div id="app"> <div v-for="(something, index) in model.filter.something" v-bind:key="something"> <input type="text" v-model.trim="model.filter.something[index]" /> {{something}} </div> <div v-for="(something, index) in model.filter.something"> <input type="text" v-model.trim="model.filter.something[index]" :key="index" /> {{something}} </div> </div></code></pre> </div> </div>

9,154,671

Distinction between processes and threads in Linux

After reading up on <a href="https://stackoverflow.com/questions/807506/threads-vs-processes-in-linux">this answer</a> and "Linux Kernel Development" by Robert Love and, subsequently, on the <code>clone()</code> system call, I discovered that processes and threads in Linux are (almost) indistinguishable to the kernel. There are a few tweaks between them (discussed as being "more sharing" or "less sharing" in the quoted SO question), but I do still have some questions yet to be answered. I recently worked on a program involving a couple of POSIX threads and decided to experiment on this premise. On a process that creates two threads, all threads of course get a unique value returned by <code>pthread_self()</code>, however, not by <code>getpid()</code>. A sample program I created follows: <pre><code>#include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <unistd.h> #include <pthread.h> void* threadMethod(void* arg) { int intArg = (int) *((int*) arg); int32_t pid = getpid(); uint64_t pti = pthread_self(); printf("[Thread %d] getpid() = %d\n", intArg, pid); printf("[Thread %d] pthread_self() = %lu\n", intArg, pti); } int main() { pthread_t threads[2]; int thread1 = 1; if ((pthread_create(&threads[0], NULL, threadMethod, (void*) &thread1)) != 0) { fprintf(stderr, "pthread_create: error\n"); exit(EXIT_FAILURE); } int thread2 = 2; if ((pthread_create(&threads[1], NULL, threadMethod, (void*) &thread2)) != 0) { fprintf(stderr, "pthread_create: error\n"); exit(EXIT_FAILURE); } int32_t pid = getpid(); uint64_t pti = pthread_self(); printf("[Process] getpid() = %d\n", pid); printf("[Process] pthread_self() = %lu\n", pti); if ((pthread_join(threads[0], NULL)) != 0) { fprintf(stderr, "Could not join thread 1\n"); exit(EXIT_FAILURE); } if ((pthread_join(threads[1], NULL)) != 0) { fprintf(stderr, "Could not join thread 2\n"); exit(EXIT_FAILURE); } return 0; } </code></pre> (This was compiled [<code>gcc -pthread -o thread_test thread_test.c</code>] on 64-bit Fedora; due to the 64-bit types used for <code>pthread_t</code> sourced from <code><bits/pthreadtypes.h></code>, the code will require minor changes to compile on 32-bit editions.) The output I get is as follows: <pre><code>[bean@fedora ~]$ ./thread_test [Process] getpid() = 28549 [Process] pthread_self() = 140050170017568 [Thread 2] getpid() = 28549 [Thread 2] pthread_self() = 140050161620736 [Thread 1] getpid() = 28549 [Thread 1] pthread_self() = 140050170013440 [bean@fedora ~]$ </code></pre> By using scheduler locking in <code>gdb</code>, I can keep the program and its threads alive so I can capture what <code>top</code> says, which, just showing processes, is: <pre><code> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 28602 bean 20 0 15272 1112 820 R 0.4 0.0 0:00.63 top 2036 bean 20 0 108m 1868 1412 S 0.0 0.0 0:00.11 bash 28547 bean 20 0 231m 16m 7676 S 0.0 0.4 0:01.56 gdb 28549 bean 20 0 22688 340 248 t 0.0 0.0 0:00.26 thread_test 28561 bean 20 0 107m 1712 1356 S 0.0 0.0 0:00.07 bash </code></pre> And when showing threads, says: <pre><code> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 28617 bean 20 0 15272 1116 820 R 47.2 0.0 0:00.08 top 2036 bean 20 0 108m 1868 1412 S 0.0 0.0 0:00.11 bash 28547 bean 20 0 231m 16m 7676 S 0.0 0.4 0:01.56 gdb 28549 bean 20 0 22688 340 248 t 0.0 0.0 0:00.26 thread_test 28552 bean 20 0 22688 340 248 t 0.0 0.0 0:00.00 thread_test 28553 bean 20 0 22688 340 248 t 0.0 0.0 0:00.00 thread_test 28561 bean 20 0 107m 1860 1432 S 0.0 0.0 0:00.08 bash </code></pre> It seems to be quite clear that programs, or perhaps the kernel, have a distinct way of defining threads in contrast to processes. Each thread has its own PID according to <code>top</code> - why?

9,154,725

3

null

2012-02-06 01:22:10.563 UTC

13

2017-03-09 05:57:50.313 UTC

2017-05-23 11:54:06.34 UTC

null

-1

null

402,390

null

1

20

c|linux|multithreading

10,096

These confusions all stem from the fact that the kernel developers originally held an irrational and wrong view that threads could be implemented almost entirely in userspace using kernel processes as the primitive, as long as the kernel offered a way to make them share memory and file descriptors. This lead to the notoriously bad LinuxThreads implementation of POSIX threads, which was rather a misnomer because it did not give anything remotely resembling POSIX thread semantics. Eventually LinuxThreads was replaced (by NPTL), but a lot of the confusing terminology and misunderstandings persist. The first and most important thing to realize is that "PID" means different things in kernel space and user space. What the kernel calls PIDs are actually kernel-level thread ids (often called TIDs), not to be confused with <code>pthread_t</code> which is a separate identifier. Each thread on the system, whether in the same process or a different one, has a unique TID (or "PID" in the kernel's terminology). What's considered a PID in the POSIX sense of "process", on the other hand, is called a "thread group ID" or "TGID" in the kernel. Each process consists of one or more threads (kernel processes) each with their own TID (kernel PID), but all sharing the same TGID, which is equal to the TID (kernel PID) of the initial thread in which <code>main</code> runs. When <code>top</code> shows you threads, it's showing TIDs (kernel PIDs), not PIDs (kernel TGIDs), and this is why each thread has a separate one. With the advent of NPTL, most system calls that take a PID argument or act on the calling process were changed to treat the PID as a TGID and act on the whole "thread group" (POSIX process).

9,620,278

How do I make calls to a REST API using C#?

This is the code I have so far: <pre><code> public class Class1 { private const string URL = "https://sub.domain.com/objects.json?api_key=123"; private const string DATA = @"{""object"":{""name"":""Name""}}"; static void Main(string[] args) { Class1.CreateObject(); } private static void CreateObject() { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL); request.Method = "POST"; request.ContentType = "application/json"; request.ContentLength = DATA.Length; StreamWriter requestWriter = new StreamWriter(request.GetRequestStream(), System.Text.Encoding.ASCII); requestWriter.Write(DATA); requestWriter.Close(); try { WebResponse webResponse = request.GetResponse(); Stream webStream = webResponse.GetResponseStream(); StreamReader responseReader = new StreamReader(webStream); string response = responseReader.ReadToEnd(); Console.Out.WriteLine(response); responseReader.Close(); } catch (Exception e) { Console.Out.WriteLine("-----------------"); Console.Out.WriteLine(e.Message); } } } </code></pre> The problem is that I think the exception block is being triggered (because when I remove the try-catch, I get a server error (500) message. But I don't see the Console.Out lines I put in the catch block. My Console: <pre class="lang-none prettyprint-override"><code>The thread 'vshost.NotifyLoad' (0x1a20) has exited with code 0 (0x0). The thread '<No Name>' (0x1988) has exited with code 0 (0x0). The thread 'vshost.LoadReference' (0x1710) has exited with code 0 (0x0). 'ConsoleApplication1.vshost.exe' (Managed (v4.0.30319)): Loaded 'c:\users\l. preston sego iii\documents\visual studio 11\Projects\ConsoleApplication1\ConsoleApplication1\bin\Debug\ConsoleApplication1.exe', Symbols loaded. 'ConsoleApplication1.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. A first chance exception of type 'System.Net.WebException' occurred in System.dll The thread 'vshost.RunParkingWindow' (0x184c) has exited with code 0 (0x0). The thread '<No Name>' (0x1810) has exited with code 0 (0x0). The program '[2780] ConsoleApplication1.vshost.exe: Program Trace' has exited with code 0 (0x0). The program '[2780] ConsoleApplication1.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0). </code></pre>

17,459,045

17

3

null

2012-03-08 15:35:01.27 UTC

190

2022-02-03 18:39:16.84 UTC

2021-01-30 21:54:29.867 UTC

null

285,795

null

356,849

null

1

423

c#|.net|rest|.net-4.5

1,353,423

The ASP.NET Web API has replaced the <a href="https://en.wikipedia.org/wiki/Windows_Communication_Foundation" rel="noreferrer">WCF</a> Web API previously mentioned. I thought I'd post an updated answer since most of these responses are from early 2012, and this thread is one of the top results when doing a Google search for "call restful service C#". Current guidance from Microsoft is to use the Microsoft ASP.NET Web API Client Libraries to consume a <a href="https://en.wikipedia.org/wiki/Representational_state_transfer#RESTful_web_services" rel="noreferrer">RESTful</a> service. This is available as a <a href="https://en.wikipedia.org/wiki/NuGet" rel="noreferrer">NuGet</a> package, Microsoft.AspNet.WebApi.Client. You will need to add this NuGet package to your solution. Here's how your example would look when implemented using the ASP.NET Web API Client Library: <pre><code>using System; using System.Collections.Generic; using System.Net.Http; using System.Net.Http.Headers; namespace ConsoleProgram { public class DataObject { public string Name { get; set; } } public class Class1 { private const string URL = "https://sub.domain.com/objects.json"; private string urlParameters = "?api_key=123"; static void Main(string[] args) { HttpClient client = new HttpClient(); client.BaseAddress = new Uri(URL); // Add an Accept header for JSON format. client.DefaultRequestHeaders.Accept.Add( new MediaTypeWithQualityHeaderValue("application/json")); // List data response. HttpResponseMessage response = client.GetAsync(urlParameters).Result; // Blocking call! Program will wait here until a response is received or a timeout occurs. if (response.IsSuccessStatusCode) { // Parse the response body. var dataObjects = response.Content.ReadAsAsync<IEnumerable<DataObject>>().Result; //Make sure to add a reference to System.Net.Http.Formatting.dll foreach (var d in dataObjects) { Console.WriteLine("{0}", d.Name); } } else { Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase); } // Make any other calls using HttpClient here. // Dispose once all HttpClient calls are complete. This is not necessary if the containing object will be disposed of; for example in this case the HttpClient instance will be disposed automatically when the application terminates so the following call is superfluous. client.Dispose(); } } } </code></pre> If you plan on making multiple requests, you should re-use your HttpClient instance. See this question and its answers for more details on why a using statement was not used on the HttpClient instance in this case: <a href="https://stackoverflow.com/questions/15705092/do-httpclient-and-httpclienthandler-have-to-be-disposed">Do HttpClient and HttpClientHandler have to be disposed between requests?</a> For more details, including other examples, see <a href="http://www.asp.net/web-api/overview/web-api-clients/calling-a-web-api-from-a-net-client" rel="noreferrer">Call a Web API From a .NET Client (C#)</a> This blog post may also be useful: <a href="http://johnnycode.com/2012/02/23/consuming-your-own-asp-net-web-api-rest-service/" rel="noreferrer">Using HttpClient to Consume ASP.NET Web API REST Services</a>

18,228,324

I need to generate uuid for my rails application. What are the options(gems) I have?

I use Rails 3.0.20 and ruby 1.8.7 (2011-06-30 patchlevel 352) Please suggest me the best plugin to generate guid.

18,228,453

4

3

null

2013-08-14 09:44:25.133 UTC

13

2022-05-27 06:40:24.263 UTC

null

948,299

null

1

110

ruby-on-rails|ruby|ruby-on-rails-3|guid|uuid

82,368

There are plenty of options, I recommend not to add additional dependencies and use <code>SecureRandom</code> which is builtin: <pre><code>SecureRandom.uuid #=> "1ca71cd6-08c4-4855-9381-2f41aeffe59c" </code></pre> See other possible formats <a href="https://apidock.com/rails/ActiveSupport/SecureRandom" rel="noreferrer">here</a>.

18,234,378

Using sed to split a string with a delimiter

I have a string in the following format: <code>string1:string2:string3:string4:string5</code> I'm trying to use <code>sed</code> to split the string on <code>:</code> and print each sub-string on a new line. Here is what I'm doing: <code>cat ~/Desktop/myfile.txt | sed s/:/\\n/</code> This prints: <pre><code>string1 string2:string3:string4:string5 </code></pre> How can I get it to split on each delimiter?

18,234,407

6

1

null

2013-08-14 14:22:55.637 UTC

18

2019-01-07 06:43:28.67 UTC

null

1,492,471

null

1

62

linux|bash|sed|string-split

214,328

To split a string with a delimiter with GNU sed you say: <pre><code>sed 's/delimiter/\n/g' # GNU sed </code></pre> For example, to split using <code>:</code> as a delimiter: <pre><code>$ sed 's/:/\n/g' <<< "he:llo:you" he llo you </code></pre> Or with a non-GNU sed: <pre><code>$ sed $'s/:/\\\n/g' <<< "he:llo:you" he llo you </code></pre> <hr> In this particular case, you missed the <code>g</code> after the substitution. Hence, it is just done once. See: <pre><code>$ echo "string1:string2:string3:string4:string5" | sed s/:/\\n/g string1 string2 string3 string4 string5 </code></pre> <code>g</code> stands for <code>g</code>lobal and means that the substitution has to be done globally, that is, for any occurrence. See that the default is 1 and if you put for example 2, it is done 2 times, etc. All together, in your case you would need to use: <pre><code>sed 's/:/\\n/g' ~/Desktop/myfile.txt </code></pre> Note that you can directly use the <code>sed ... file</code> syntax, instead of unnecessary piping: <code>cat file | sed</code>.

15,313,469

Java Keyboard Keycodes list

Can anybody provide me with the Key Code integer list for individual keys used on the Keyboard for the KeyEvent class in java? I want to create a dropdown list of all the keyboard keys for the user to select. I need the list specific to Keyboard. The VK constants does not help in this case because I need a 'list' of Keys used on the Keyboard. <a href="https://stackoverflow.com/questions/1627925/where-can-i-find-a-list-of-keyboard-keycodes">This post here</a> didn't come of use because it's for Javascript and the codes aren't the same for all keys comparing with the <a href="http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.event.KeyEvent.VK_M" rel="noreferrer">javadoc</a>. Also the KeyCode values used in <a href="http://docs.oracle.com/javase/7/docs/api/constant-values.html#java.awt.event.KeyEvent.VK_M" rel="noreferrer">javadoc</a> are all arranged in Alphabetical Order, so it's hard to find the Keyboard keys over there. I tried googling for sources but nothing interesting came up just the Javascript one. Should I just compile them one by one myself or is there an easier way? Edit: I know about VK. I need to use KeyEvent.getKeyText function to store each of the keyboard keys in a dropdown menu. So i need the list. That's why I asked should I need to compile them myself. I should have mentioned that earlier. It would be a waste of time doing that for each key.

15,313,498

5

0

null

2013-03-09 17:04:29.203 UTC

5

2021-07-02 09:10:07.73 UTC

2017-05-23 12:16:43.803 UTC

null

-1

null

1,440,535

null

1

9

java|applet|keylistener|keyevent

111,334

<a href="http://docs.oracle.com/javase/7/docs/api/java/awt/event/KeyEvent.html" rel="noreferrer">KeyEvent</a> class has static fields with these values. For example, <code>KeyEvent.VK_A</code> represent "A" key. To get the fields names you can use reflection: <pre><code>Field[] fields = java.awt.event.KeyEvent.class.getDeclaredFields(); for (Field f : fields) { if (Modifier.isStatic(f.getModifiers())) { System.out.println(f.getName()); } } </code></pre>

15,249,492

How to organize resources (styles, ...) in a complex WPF scenario?

How can WPF resources - including styles, templates, etc. - be organized, so that I can use them across Windows, Pages or even Projects. What options do I have to achieve maximum re-usability of my resources and a maintainable structure (for example one file per Template)? For example: I am creating a WPF application and I want to use a TabControl, but I want to make major changes to it. So I could create a style in and apply it to the TabControl and TabItem. That's ok, but where can I place my resources to keep my Window XAML clear and have the style accessible from other Windows or projects as well? I found that I can add it to App.xaml but that is only a solution for one project and allows sharing just between items of this project. Also, I think it would be better to have these templates a little separate from other code, than placing it all in some page or app.xaml?

15,249,742

3

1

null

2013-03-06 14:09:16.957 UTC

8

2017-06-01 12:27:52.34 UTC

2013-03-07 09:11:52.613 UTC

null

645,104

null

367,593

null

1

17

c#|wpf|templates|styles

10,142

I usually create a seperate styling project, which I reference from the projects, which I want to style. The styling project has a fixed structure like this: <img src="https://i.stack.imgur.com/YmGpQ.png" alt="Styling project"> For every control, I create a styling <code>ResourceDictionary</code>. For example for my buttons: <pre class="lang-xml prettyprint-override"><code><ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Style x:Key="PrimaryButtonStyle" TargetType="Button"> </Style> <Style x:Key="ToolbarButton" TargetType="Button"> <Setter Property="BorderThickness" Value="0" /> <Setter Property="Margin" Value="3"/> <Setter Property="Background" Value="Transparent"></Setter> </Style> </ResourceDictionary> </code></pre> In one main <code>ResourceDictionary</code>, I merge all the other dictionaries, in this case in the file IncaDesign.xaml, which you can see in the picture above: <pre class="lang-xml prettyprint-override"><code><ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:controls="clr-namespace:Commons.Controls;assembly=Commons"> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Converter/Converter.xaml" /> <ResourceDictionary Source="Styles/Button.xaml" /> <ResourceDictionary Source="BitmapGraphics/Icons.xaml" /> </ResourceDictionary.MergedDictionaries>  <Style TargetType="Button" BasedOn="{StaticResource PrimaryButtonStyle}"></Style> </ResourceDictionary> </code></pre> Notice how I defined the default styles, which are applied automatically, unless you specify otherwise. In every window or control, that you want to style, you only need to reference this one <code>ResourceDictionary</code>. Note the definition of the source, which is a reference to the assembly (<code>/Commons.Styling;component...</code>) <pre class="lang-xml prettyprint-override"><code><UserControl.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/Commons.Styling;component/IncaDesign.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </UserControl.Resources> </code></pre> Default styles will be set automatically now, and if you want to access a resource explicitly, you can do this, using <code>StaticResource</code>. <pre class="lang-xml prettyprint-override"><code><Viewbox Height="16" Width="16" Margin="0,0,10,0"> <ContentControl Content="{StaticResource FileIcon32}" /> </Viewbox> </code></pre> This is very nice solution in my opinion, which works for very complex solutions, including modular solutions, for example built with PRISM.

15,283,523

Reshaping a 1-d array to a multidimensional array

Taking into consideration the entire C++11 standard, is it possible for any conforming implementation to succeed the first assertion below but fail the latter? <pre><code>#include <cassert> int main(int, char**) { const int I = 5, J = 4, K = 3; const int N = I * J * K; int arr1d[N] = {0}; int (&arr3d)[I][J][K] = reinterpret_cast<int (&)[I][J][K]>(arr1d); assert(static_cast<void*>(arr1d) == static_cast<void*>(arr3d)); // is this necessary? arr3d[3][2][1] = 1; assert(arr1d[3 * (J * K) + 2 * K + 1] == 1); // UB? } </code></pre> If not, is this technically UB or not, and does that answer change if the first assertion is removed (is <code>reinterpret_cast</code> guaranteed to preserve addresses here?)? Also, what if the reshaping is done in the opposite direction (3d to 1d) or from a 6x35 array to a 10x21 array? EDIT: If the answer is that this is UB because of the <code>reinterpret_cast</code>, is there some other strictly compliant way of reshaping (e.g., via <code>static_cast</code> to/from an intermediate <code>void *</code>)?

15,284,276

2

6

null

2013-03-07 23:01:37.59 UTC

12

2021-03-20 22:15:48.127 UTC

2013-03-07 23:50:07.62 UTC

null

2,008,149

null

2,008,149

null

1

19

c++|c++11|multidimensional-array|language-lawyer

5,225

Update 2021-03-20: This same question was <a href="https://www.reddit.com/r/cpp_questions/comments/m9a7fs/reinterpret_a_1d_array_as_a_2d_array/" rel="nofollow noreferrer">asked on Reddit</a> recently and it was pointed out that my original answer is flawed because it does not take into account this <a href="https://eel.is/c++draft/expr#basic.lval-11" rel="nofollow noreferrer">aliasing rule</a>: <blockquote> If a program attempts to access the stored value of an object through a glvalue whose type is not similar to one of the following types the behavior is undefined: <ul> <li>the dynamic type of the object,</li> <li>a type that is the signed or unsigned type corresponding to the dynamic type of the object, or</li> <li>a char, unsigned char, or std::byte type.</li> </ul> </blockquote> Under the rules for <a href="https://eel.is/c++draft/expr#conv.qual-2" rel="nofollow noreferrer">similarity</a>, these two array types are not similar for any of the above cases and therefore it is technically undefined behaviour to access the 1D array through the 3D array. (This is definitely one of those situations where, in practice, it will almost certainly work with most compilers/targets) Note that the references in the original answer refer to an older C++11 draft standard <h1>Original answer:</h1> <h2><code>reinterpret_cast</code> of references</h2> The standard states that an lvalue of type <code>T1</code> can be <code>reinterpret_cast</code> to a reference to <code>T2</code> if a pointer to <code>T1</code> can be <code>reinterpret_cast</code> to a pointer to <code>T2</code> (§5.2.10/11): <blockquote> An lvalue expression of type <code>T1</code> can be cast to the type “reference to <code>T2</code>” if an expression of type “pointer to <code>T1</code>” can be explicitly converted to the type “pointer to <code>T2</code>” using a reinterpret_cast. </blockquote> So we need to determine if a <code>int(*)[N]</code> can be converted to an <code>int(*)[I][J][K]</code>. <h2><code>reinterpret_cast</code> of pointers</h2> A pointer to <code>T1</code> can be <code>reinterpret_cast</code> to a pointer to <code>T2</code> if both <code>T1</code> and <code>T2</code> are standard-layout types and <code>T2</code> has no stricter alignment requirements than <code>T1</code> (§5.2.10/7): <blockquote> When a prvalue v of type “pointer to T1” is converted to the type “pointer to cv T2”, the result is <code>static_cast<cv T2*>(static_cast<cv void*>(v))</code> if both <code>T1</code> and <code>T2</code> are standard-layout types (3.9) and the alignment requirements of <code>T2</code> are no stricter than those of <code>T1</code>, or if either type is void. </blockquote> <ol> <li>Are <code>int[N]</code> and <code>int[I][J][K]</code> standard-layout types? <code>int</code> is a scalar type and arrays of scalar types are considered to be standard-layout types (§3.9/9). <blockquote> Scalar types, standard-layout class types (Clause 9), arrays of such types and cv-qualified versions of these types (3.9.3) are collectively called standard-layout types. </blockquote> </li> <li>Does <code>int[I][J][K]</code> have no stricter alignment requirements than <code>int[N]</code>. The result of the <code>alignof</code> operator gives the alignment requirement of a complete object type (§3.11/2). <blockquote> The result of the <code>alignof</code> operator reflects the alignment requirement of the type in the complete-object case. </blockquote> Since the two arrays here are not subobjects of any other object, they are complete objects. Applying <code>alignof</code> to an array gives the alignment requirement of the element type (§5.3.6/3): <blockquote> When <code>alignof</code> is applied to an array type, the result shall be the alignment of the element type. </blockquote> So both array types have the same alignment requirement. </li> </ol> That makes the <code>reinterpret_cast</code> valid and equivalent to: <pre><code>int (&arr3d)[I][J][K] = *reinterpret_cast<int (*)[I][J][K]>(&arr1d); </code></pre> where <code>*</code> and <code>&</code> are the built-in operators, which is then equivalent to: <pre><code>int (&arr3d)[I][J][K] = *static_cast<int (*)[I][J][K]>(static_cast<void*>(&arr1d)); </code></pre> <h2><code>static_cast</code> through <code>void*</code></h2> The <code>static_cast</code> to <code>void*</code> is allowed by the standard conversions (§4.10/2): <blockquote> A prvalue of type “pointer to cv <code>T</code>,” where <code>T</code> is an object type, can be converted to a prvalue of type “pointer to cv void”. The result of converting a “pointer to cv <code>T</code>” to a “pointer to cv void” points to the start of the storage location where the object of type <code>T</code> resides, as if the object is a most derived object (1.8) of type <code>T</code> (that is, not a base class subobject). </blockquote> The <code>static_cast</code> to <code>int(*)[I][J][K]</code> is then allowed (§5.2.9/13): <blockquote> A prvalue of type “pointer to cv1 <code>void</code>” can be converted to a prvalue of type “pointer to cv2 <code>T</code>,” where <code>T</code> is an object type and cv2 is the same cv-qualification as, or greater cv-qualification than, cv1. </blockquote> So the cast is fine! But are we okay to access objects through the new array reference? <h2>Accessing array elements</h2> Performing array subscripting on an array like <code>arr3d[E2]</code> is equivalent to <code>*((E1)+(E2))</code> (§5.2.1/1). Let's consider the following array subscripting: <pre><code>arr3d[3][2][1] </code></pre> Firstly, <code>arr3d[3]</code> is equivalent to <code>*((arr3d)+(3))</code>. The lvalue <code>arr3d</code> undergoes array-to-pointer conversion to give a <code>int(*)[2][1]</code>. There is no requirement that the underlying array must be of the correct type to do this conversion. The pointers value is then accessed (which is fine by §3.10) and then the value 3 is added to it. This pointer arithmetic is also fine (§5.7/5): <blockquote> If both the pointer operand and the result point to elements of the same array object, or one past the last element of the array object, the evaluation shall not produce an overflow; otherwise, the behavior is undefined. </blockquote> This this pointer is dereferenced to give an <code>int[2][1]</code>. This undergoes the same process for the next two subscripts, resulting in the final <code>int</code> lvalue at the appropriate array index. It is an lvalue due to the result of <code>*</code> (§5.3.1/1): <blockquote> The unary * operator performs indirection: the expression to which it is applied shall be a pointer to an object type, or a pointer to a function type and the result is an lvalue referring to the object or function to which the expression points. </blockquote> It is then perfectly fine to access the actual <code>int</code> object through this lvalue because the lvalue is of type <code>int</code> too (§3.10/10): <blockquote> If a program attempts to access the stored value of an object through a glvalue of other than one of the following types the behavior is undefined: <ul> <li>the dynamic type of the object</li> <li>[...]</li> </ul> </blockquote> So unless I've missed something. I'd say this program is well-defined.

15,379,860

"Close Others" command shortcut in Sublime Text 2

I am trying to add a shortcut for "Close Others" tabs, but can't seem to find the command, here is what I am trying: <pre><code>{ "keys": ["super+alt+w"], "command": "close_others" } </code></pre> <kbd>Cmd</kbd>+<kbd>Option</kbd>+<kbd>W</kbd> - sort of like <kbd>Cmd</kbd>+<kbd>Option</kbd>+<kbd>H</kbd> in OS X, close all except the current tab, see? Anyway, <code>close_others</code> doesn't seem to do anything. I have tried <code>close_other_windows</code>, <code>close_other_tabs</code>, nothing works. What is the right command to do that? And while we're on it, how do you know what commands are available? My next one will be <kbd>Cmd</kbd>+<kbd>Option</kbd>+<kbd>Shift</kbd>+<kbd>W</kbd> - "Close Tabs to the Right". For some improvements in Sublime window management see "<a href="https://stackoverflow.com/questions/13561487/solved-sublime-text-2-close-all-tabs-but-not-the-window-how">Close all tabs, but not the window, in Sublime Text</a>" Thanks!

15,380,759

2

0

null

2013-03-13 08:03:45.863 UTC

9

2015-01-30 13:07:32.84 UTC

2017-05-23 12:09:37.75 UTC

null

-1

null

166,484

null

1

21

command|keyboard-shortcuts|sublimetext2|sublimetext

5,373

The command is <code>close_others_by_index</code>. Unfortunately, it takes arguments that cannot be passed via a simple key binding. To make it work, you have to create a plugin. <code>Tools/New Plugin...</code>: <pre class="lang-py prettyprint-override"><code>import sublime_plugin class CloseOthersCommand(sublime_plugin.TextCommand): def run(self, edit): window = self.view.window() group_index, view_index = window.get_view_index(self.view) window.run_command("close_others_by_index", { "group": group_index, "index": view_index}) </code></pre> Save it in <code>Packages/User</code> directory. Then you can add your key binding: <pre><code>{ "keys": ["super+alt+w"], "command": "close_others" } </code></pre> The same is true for "Close tabs to the right". The command is <code>close_to_right_by_index</code>. The plugin: <pre class="lang-py prettyprint-override"><code>import sublime_plugin class CloseToRightCommand(sublime_plugin.TextCommand): def run(self, edit): window = self.view.window() group_index, view_index = window.get_view_index(self.view) window.run_command("close_to_right_by_index", { "group": group_index, "index": view_index}) </code></pre> The key binding: <pre><code>{ "keys": ["super+alt+shift+w"], "command": "close_to_right" } </code></pre>

15,200,362

When to use Single method Interfaces in Java

I have seen in many libraries like <code>Spring</code> which use a lot of interfaces with single methods in them like <code>BeanNameAware</code>, etc. And the implementer class will implement many interfaces with single methods. In what scenarios does it make sense to keep single method interfaces? Is it done to avoid making one single interface bulky for example <code>ResultSet</code>? Or is there some design standard which advocates the use of these type of interfaces?

15,200,760

5

0

null

2013-03-04 11:21:21.437 UTC

9

2017-12-21 06:50:21.953 UTC

null

1,719,067

null

1

24

java|oop|design-patterns|interface

15,999

With Java 8, keeping the single method interface is quite useful, since single method interfaces will allow the usage of closures and "function pointers". So, whenever your code is written against a single method interface, the client code may hand in a closure or a method (which must have a compatible signature to the method declared in the single method interface) instead of having to create an anonymous class. In contrast, if you make one interface with more than one method, the client code will not have that possibility. It must always use a class that implements all methods of the interface. So as a common guideline, one can say: If a class that only exposes a single method to the client code might be useful to some client, then using a single method interface for that method is a good idea. A counter example to this is the <code>Iterator</code> interface: Here, it would not be useful having only a <code>next()</code> method without a <code>hasNext()</code> method. Since having a class that only implements one of these methods is no use, splitting this interface is not a good idea here. Example: <pre><code>interface SingleMethod{ //The single method interface void foo(int i); } class X implements SingleMethod { //A class implementing it (and probably other ones) void foo(int i){...} } class Y { //An unrelated class that has methods with matching signature void bar(int i){...} static void bar2(int i){...} } class Framework{ // A framework that uses the interface //Takes a single method object and does something with it //(probably invoking the method) void consume(SingleMethod m){...} } class Client{ //Client code that uses the framework Framework f = ...; X x = new X(); Y y = new Y(); f.consume(x); //Fine, also in Java 7 //Java 8 //ALL these calls are only possible since SingleMethod has only ONE method! f.consume(y::bar); //Simply hand in a method. Object y is bound implicitly f.consume(Y::bar2); //Static methods are fine, too f.consume(i -> { System.out.println(i); }) //lambda expression. Super concise. //This is the only way if the interface has MORE THAN ONE method: //Calling Y.bar2 Without that closure stuff (super verbose) f.consume(new SingleMethod(){ @Override void foo(int i){ Y.bar2(i); } }); } </code></pre>

15,109,958

Understanding convertPoint:toView:

I do not quite understand the method <code>convertPoint:toView:</code>. In Apple's documentation it is written that <blockquote> <code>convertPoint:toView:</code> Converts a point from the receiver’s coordinate system to that of the specified view. <pre><code>- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view </code></pre> </blockquote> But what does converting a point from one to the other actually mean? Does it imply that the points in both bounds have different units? Or just different values? If it is the latter, why is there such a method when we can simply assign the value of a's <code>contentOffset</code> to b's ? <pre><code>CGPoint a = [a contentOffset]; [b setContentOffset:a]; </code></pre> How is <code>convertPoint:toView:</code> different from simply assigning <code>contentOffset</code>? Or did I misunderstand the entire concept? What does converting points actually do? When should this method be used?

15,114,612

1

6

null

2013-02-27 10:39:45.57 UTC

14

2015-12-18 06:10:30.883 UTC

null

603,977

null

2,024,727

null

1

46

ios|cocoa-touch|uiview|geometry

22,399

Every UIView has its own coordinates system. So if you have a UIView_1 that contains another UIView_2, they both have a point (10,10) within them. convertPoint:toView: allows the developer to take a point in one view and convert the point to another view coordinate system. Example: view1 contains view2. The top left corner of view2 is located at view1 point (10,10), or better to say view2.frame.orgin = {10,10}. That {10,10} is based in the view1 coordinate system. So far so good. The user touches the view2 at point {20,20} inside the view2. Now those coordinates are in the view2 coordinate system. You can now use covertPoint:toView: to convert {20,20} into the coordinate system of view1. touchPoint = {20,20} <pre><code>CGPoint pointInView1Coords = [view2 convertPoint:touchPoint toView:view1]; </code></pre> So now pointInView1Coords should be {30,30} in the view1 coordinate systems. Now that was just simple math on this example, but there are all sorts of things that contribute to the conversion. Transforms and scaling come to mind. Read about UIView frame, bounds, and center. They are all related and they deal with coordinate systems for a view. Its confusing until you start doing stuff with them. Remember this frame and center are in the parent's coordinate system. Bounds is in the view's coordinate system. John

15,300,572

Saving lists to txt file

I'm trying to save a list to a text file. This is my code: <pre><code>public void button13_Click(object sender, EventArgs e) { TextWriter tw = new StreamWriter("SavedLists.txt"); tw.WriteLine(Lists.verbList); tw.Close(); } </code></pre> This is what I get in the text file: <blockquote> System.Collections.Generic.List`1[System.String] </blockquote> Do I have to use <code>ConvertAll<></code>? If so, I'm not sure how to use that.

15,300,618

3

null

2013-03-08 18:13:16.233 UTC

6

2016-05-13 13:29:04.853 UTC

2013-03-08 18:28:35.927 UTC

null

1,159,478

null

2,061,451

null

1

75

c#|list

166,326

Assuming your Generic List is of type String: <pre><code>TextWriter tw = new StreamWriter("SavedList.txt"); foreach (String s in Lists.verbList) tw.WriteLine(s); tw.Close(); </code></pre> Alternatively, with the using keyword: <pre><code>using(TextWriter tw = new StreamWriter("SavedList.txt")) { foreach (String s in Lists.verbList) tw.WriteLine(s); } </code></pre>

7,735,635

Real example of TryUpdateModel, ASP .NET MVC 3

I can't understand, how to use TryUpdateModel and save the MVC architecture at the same time. If I am not mistaken, work with datacontexts must be in the Model. So, such code <pre><code>var db=new TestEverybody();//it is class, which was generated by EntityFramework var currentTesting=db.Testing.(t => t.id == id).First(); </code></pre> must be situated in the Model, not in the Controller, mustn't it? But the ussual examples of TryUpdateModel usage is following: <pre><code> public ActionResult Edit(Testing obj)//Testing collection { var db = new TestEverybody(); var currentTesting=db.Testing.(t => t.id == obj.id).First(); TryUpdateModel(currentTesting); db.SaveChanges(); return RedirectToAction("Index"); } </code></pre> Doesn't this way break the MVC architecture? We work with database in the controller, not in the special Model class. So, what is the best way to use TryUpdateModel in a real project?

7,777,059

2

3

null

2011-10-12 05:26:27.037 UTC

37

2011-10-15 09:45:34.097 UTC

null

352,130

null

1

30

asp.net-mvc|model|controller

41,493

Since the OP asked, here's an example of the ViewModel pattern, or as I like to call it - ASP.NET MVC done properly. So why use a view specific model <ol> <li>You should only pass the information to your view that it needs.</li> <li>Often you'll need to add additional view-meta-data (such as title/description attributes). These do not belong on your entities.</li> <li>Using TryUpdateModel/UpdateModel is wrong. Don't use (I'll explain why).</li> <li>It's very rare that your view-models will exactly match your entities. People often end up adding additional cruft to their entities or (not much better) just using ViewBag rather than strongly typed view model properties.</li> <li>If you're using an ORM you can run into issues with Lazy loaded properties (N+1). Your views should not issue queries.</li> </ol> We'll start with a simple entity: <pre><code>public class Product { public int Id {get;set;} public string Name {get;set;} public string Description {get;set;} public decimal Price {get;set;} } </code></pre> And let's say you have a simple form where the user can only update the <code>Name</code> and <code>Description</code> of the product. But you're using (the very greedy) TryUpdateModel. So I use any number of tools (like Fiddler) to construct a POST myself and send the following: <blockquote> Name=WhatverIWant&Description=UnluckyFool&Price=0 </blockquote> Well the ASP.NET MVC model binder is going to inspect the input form collection, see that these properties exist on your entity and automatically bind them for you. So when you call "TryUpdateModel" on the entity you've just retrieved from your database, all of the matching properties will be updated (including the Price!). Time for a new option. <h3>View Specific Model</h3> <pre><code>public class EditProductViewModel { [HiddenInput] public Guid Id {get;set;} [Required] [DisplayName("Product Name")] public string Name {get;set;} [AllowHtml] [DataType(DataType.MultilineText)] public string Description {get;set;} } </code></pre> This contains just the properties we need in our view. Notice we've also added some validation attributes, display attributes and some mvc specific attributes. By not being restricted in what we have in our view model it can make your views much cleaner. For example, we could render out our entire edit form by having the following in our view: <pre><code>@Html.EditorFor(model => model) </code></pre> Mvc will inspect all of those attributes we've added to our view model and automatically wire up validation, labels and the correct input fields (i.e. a textarea for description). <h3>POSTing the form</h3> <pre><code>[HttpPost] public ActionResult EditProduct(EditProductViewModel model) { var product = repository.GetById(model.Id); if (product == null) { return HttpNotFound(); } // input validation if (ModelState.IsValid) { // map the properties we **actually** want to update product.Name = model.Name; product.Description = model.Description; repository.Save(product); return RedirectToAction("index"); } return View(model) } </code></pre> It's fairly obvious from this code what it does. We don't have any undesirable effects when we update our entity since we are explicitly setting properties on our entity. I hope this explains the View-Model pattern enough for you to want to use it.

65,134,181

Why does a Java string comparison behave different in Java 15 and Java 11?

Please consider the following class: <pre><code>class Eq { public static void main(String[] args) { System.out.println("" == ".".substring(1)); } } </code></pre> The example is supposed to show that multiple copies of the empty string may exist in memory. I still have an old OpenJDK 11 where the program outputs <code>false</code> as expected. Under OpenJDK 15, the program outputs <code>true</code>. The generated bytecode for the class files looks similar (even though they differ in register values): Java 11: <pre><code>public static void main(java.lang.String[]); Code: 0: getstatic #7 // Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #13 // String 5: ldc #15 // String . 7: iconst_1 8: invokevirtual #17 // Method java/lang/String.substring:(I)Ljava/lang/String; 11: if_acmpne 18 14: iconst_1 15: goto 19 18: iconst_0 19: invokevirtual #23 // Method java/io/PrintStream.println:(Z)V 22: return </code></pre> Java 15: <pre><code>public static void main(java.lang.String[]); Code: 0: getstatic #2 // Field java/lang/System.out:Ljava/io/PrintStream; 3: ldc #3 // String 5: ldc #4 // String . 7: iconst_1 8: invokevirtual #5 // Method java/lang/String.substring:(I)Ljava/lang/String; 11: if_acmpne 18 14: iconst_1 15: goto 19 18: iconst_0 19: invokevirtual #6 // Method java/io/PrintStream.println:(Z)V 22: return </code></pre> I tried to exclude static compiler optimizations by reading "." from stdin but this does not change the outcome. I have tried to disable the JIT via <code>-Djava.compiler=NONE</code> and played around with adjusting the string table size via <code>-XX:StringTableSize=100000</code>. I now have the following questions: <ul> <li>Can someone reproduce the issue (i.e. did I do it correctly? I can provide the class files if that helps)</li> <li>How do I find out the exact reason for the different behaviour?</li> <li>What (in your opinion) is the source for the different behaviour?</li> </ul> I think just strategies to approach how to find the reason for the behaviour that don't answer the question might also be interesting.

65,134,318

1

4

null

2020-12-03 21:08:52.89 UTC

4

2021-01-04 11:25:37.857 UTC

null

1,109,583

null

1,109,583

null

1

28

java|string|memory|equality

1,825

This is mentioned in the <a href="https://www.oracle.com/java/technologies/javase/15-relnote-issues.html#JDK-8240094" rel="noreferrer">JDK 15 Release Notes</a>. It was changed as requested by JDK-8240094: <blockquote> <a href="https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8240094" rel="noreferrer">JDK-8240094</a> : Optimize empty substring handling <code>String.substring</code> return <code>""</code> in some cases, but could be improved to do so in all cases when the substring length is zero. </blockquote> Related: <blockquote> <a href="https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8240225" rel="noreferrer">JDK-8240225</a> : Optimize empty substring handling Optimize <code>String.substring</code> and related operations like <code>stripLeading</code>, <code>stripTrailing</code> to avoid redundantly creating a new empty String. </blockquote> Sub Task: <blockquote> <a href="https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8251556" rel="noreferrer">JDK-8251556</a> : Release Note: Optimized Empty Substring Handling The implementation of <code>String.substring</code> and related methods <code>stripLeading</code> and <code>stripTrailing</code> have changed in this release to avoid redundantly creating a new empty String. This may impact code that depends on unspecified behaviour and the identity of empty sub-strings. </blockquote>

5,445,847

List available COM ports

I have a very small code that shows available COM ports. My question is: Is there an easy way to have the program to run in the tray and only popup when a new COM port is available and is it possible to add the name for the COM port that you can see in device manager ec "USB serial port"? I often add/remove a USB->RS232 comverter and find it a pain in the ass because I must go into the device manger to see what COM port it is assigned to. It's not the same each time Maybe there already is a small app that can do this but I havent found it on Google yet <pre><code>using System; using System.Windows.Forms; using System.IO.Ports; namespace Available_COMports { public partial class Form1 : Form { public Form1() { InitializeComponent(); //show list of valid com ports foreach (string s in SerialPort.GetPortNames()) { listBox1.Items.Add(s); } } private void Form1_Load(object sender, EventArgs e) { } private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { } } </code></pre> }

5,446,366

4

0

null

2011-03-26 22:42:56.233 UTC

5

2018-04-17 16:44:49.737 UTC

null

302,935

null

1

20

c#|windows|forms

77,317

Take a look at <a href="https://stackoverflow.com/questions/1081871/how-to-find-available-com-ports">this question</a>. It uses WMI to find available COM ports. You could keep track of what COM ports exist, and only notify about new ones.

5,010,191

Using DataContractSerializer to serialize, but can't deserialize back

I have the following 2 functions: <pre><code>public static string Serialize(object obj) { DataContractSerializer serializer = new DataContractSerializer(obj.GetType()); MemoryStream memoryStream = new MemoryStream(); serializer.WriteObject(memoryStream, obj); return Encoding.UTF8.GetString(memoryStream.GetBuffer()); } public static object Deserialize(string xml, Type toType) { MemoryStream memoryStream = new MemoryStream(Encoding.UTF8.GetBytes(xml)); // memoryStream.Position = 0L; XmlDictionaryReader reader = XmlDictionaryReader.CreateTextReader(memoryStream, Encoding.UTF8, new XmlDictionaryReaderQuotas(), null); DataContractSerializer dataContractSerializer = new DataContractSerializer(toType); return dataContractSerializer.ReadObject(reader); } </code></pre> The first one seems to serialize an object to an xml string just fine. The XML appears valid, no broken tags, no white spaces at the beginning or at the end, etc. Now the second function doesn't want to deserialize my xml string back to the object. On the last line I get: <blockquote> There was an error deserializing the object of type [MY OBJECT TYPE HERE]. The data at the root level is invalid. Line 1, position 1. </blockquote> What am I doing wrong? I tried rewriting the Deserialize function a few times, and it always seems to be the same kind of error. Thank you! Oh, and this is how I'm calling the 2 functions: <pre><code>SomeObject so = new SomeObject(); string temp = SerializationManager.Serialize(so); so = (SomeObject)SerializationManager.Deserialize(temp, typeof(SomeObject)); </code></pre>

5,010,376

4

0

null

2011-02-15 22:20:22.573 UTC

29

2012-01-02 08:30:55.23 UTC

null

431,937

null

1

66

c#|c#-4.0|xml-serialization|datacontractserializer

109,231

Here is how I've always done it: <pre><code> public static string Serialize(object obj) { using(MemoryStream memoryStream = new MemoryStream()) using(StreamReader reader = new StreamReader(memoryStream)) { DataContractSerializer serializer = new DataContractSerializer(obj.GetType()); serializer.WriteObject(memoryStream, obj); memoryStream.Position = 0; return reader.ReadToEnd(); } } public static object Deserialize(string xml, Type toType) { using(Stream stream = new MemoryStream()) { byte[] data = System.Text.Encoding.UTF8.GetBytes(xml); stream.Write(data, 0, data.Length); stream.Position = 0; DataContractSerializer deserializer = new DataContractSerializer(toType); return deserializer.ReadObject(stream); } } </code></pre>

4,953,272

How to match exact "multiple" strings in Python

I've got a list of exact patterns that I want to search in a given string. Currently I've got a real bad solution for such a problem. <pre><code>pat1 = re.compile('foo.tralingString') mat1 = pat1.match(mystring) pat2 = re.compile('bar.trailingString') mat2 = pat2.match(mystring) if mat1 or mat2: # Do whatever pat = re.compile('[foo|bar].tralingString') match = pat.match(mystring) # Doesn't work </code></pre> The only condition is that I've got a list of strings which are to be matched exactly. Whats the best possible solution in Python. EDIT: The search patterns have some trailing patterns common.

4,953,289

5

0

null

2011-02-10 04:09:48.693 UTC

7

2011-02-10 04:28:51.423 UTC

2011-02-10 04:17:11.267 UTC

null

1,678,010

null

1,678,010

null

1

19

python|regex

61,476

You could do a trivial regex that combines those two: <pre><code>pat = re.compile('foo|bar') if pat.match(mystring): # Do whatever </code></pre> You could then expand the regex to do whatever you need to, using the <code>|</code> separator (which means or in regex syntax) Edit: Based upon your recent edit, this should do it for you: <pre><code>pat = re.compile('(foo|bar)\\.trailingString'); if pat.match(mystring): # Do Whatever </code></pre> The <code>[]</code> is a character class. So your <code>[foo|bar]</code> would match a string with one of the included characters (since there's no * or + or ? after the class). <code>()</code> is the enclosure for a sub-pattern.

5,144,110

Concatenating a variable and a string literal without a space in PowerShell

How can I write a variable to the console without a space after it? There are problems when I try: <pre><code>$MyVariable = "Some text" Write-Host "$MyVariableNOSPACES" </code></pre> I'd like the following output: <pre><code>Some textNOSPACES </code></pre>

5,149,170

7

1

null

2011-02-28 15:43:37.053 UTC

9

2020-01-14 13:59:16.147 UTC

2017-06-05 21:58:48.4 UTC

null

63,550

null

111,327

null

1

56

string|powershell

87,813

Another option and possibly the more canonical way is to use curly braces to delineate the name: <pre><code>$MyVariable = "Some text" Write-Host "${MyVariable}NOSPACES" </code></pre> This is particular handy for paths e.g. <code>${ProjectDir}Bin\$Config\Images</code>. However, if there is a <code>\</code> after the variable name, that is enough for PowerShell to consider that not part of the variable name.

5,431,413

Difference between protocol and delegates?

What is the difference between a <code>protocol</code> and a <code>delegate</code>? and, How can we declare <code>variables</code> in a <code>protocol class</code>?

5,431,545

7

0

null

2011-03-25 10:48:41.647 UTC

38

2020-06-10 21:17:13.7 UTC

2019-08-19 12:15:59.453 UTC

null

5,175,709

null

649,317

null

1

58

ios|objective-c|delegates|protocols

59,965

A protocol, declared with the (<code>@protocol</code> syntax in Objective-C) is used to declare a set of methods that a class "adopts" (declares that it will use this protocol) will implement. This means that you can specify in your code that, "you don't care which class is used as long as it implements a particular protocol". This can be done in Objective-C as follows: <code>id<MyProtocol> instanceOfClassThatImplementsMyProtocol;</code> If you state this in your code, then any class that "conforms" to the protocol MyProtocol can be used in the variable instanceOfClassThatImplementsMyProtocol. This means that the code that uses this variable knows that it can use whichever methods are defined in MyProtocol with this particular variable, regardless of what class it is. This is a great way of avoiding the inheritance design pattern, and avoids tight coupling. Delegates are a use of the language feature of protocols. The <a href="http://en.wikipedia.org/wiki/Delegation_pattern" rel="noreferrer">delegation design pattern</a> is a way of designing your code to use protocols where necessary. In the Cocoa frameworks, the delegate design pattern is used to specify an instance of a class which conforms to a particular protocol. This particular protocol specifies methods that the delegate class should implement to perform specific actions at given events. The class that uses the delegate knows that its delegate coforms to the protocol, so it knows that it can call the implemented methods at given times. This design pattern is a great way of decoupling the classes, because it makes it really easy to exchange one delegate instance for another - all the programmer has to do is ensure that the replacement instance or class conforms to the necessary protocol (i.e. it implements the methods specified in the protocol)! Protocols and delegates are not restricted only to Objective-C and Mac/iOS development, but the Objective-C language and the Apple frameworks make heavy use of this awesome language feature and design pattern. Edit: Here's an example. In the UIKit framework of Cocoa Touch, there is a UITextFieldDelegate protocol. This protocol defines a series of methods that classes which are delegates of a UITextField instance should implement. In other words, if you want to assign a delegate to a UITextField (using the <code>delegate</code> property), you'd better make sure that this class conforms to UITextFieldDelegate. In fact, because the delegate property of UITextField is defined as: <code>@property(nonatomic, weak) id<UITextFieldDelegate> delegate</code> Then the compiler will give warnings if you assign a class to it that doesn't implement the protocol. This is really useful. You have to state that a class implements a protocol, and in saying that it does, you're letting other classes know that they can interact in a particular way with your class. So, if you assign an instance of MyTextFieldDelegateClass to the <code>delegate</code> property of UITextField, the UITextField knows that it can call some particular methods (related to text entry, selection etc.) of your MyTextFieldDelegateClass. It knows this because MyTextFieldDelegateClass has said that it will implement the UITextFieldDelegate protocol. Ultimately, this all leads to much greater flexibility and adaptability in your project's code, which I'm sure you'll soon realise after using this technology! :)