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  • C++ undefined reference

    - by klaus-johan
    Hi , My problem is the following : I have a class A that inherits from an abstract base class. I override all the virtual functions from the base class, and I have a constructor like this : A::A(B* b) { this->b=b; } In the constructor of class B , I have the following piece of code: A* a=new A(this) However this line of code gives the error : undefined reference to 'A::A(B*)' I have absolutly no idea why could this be happening , so any suggestion would be greatly appreciated !

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  • loading javascript file after jquery.ready

    - by Spines
    I want to load a javascript file at the end of jquery.ready so that the code in my ready handler doesn't have to wait to execute until this large javascript file is loaded. My jquery.ready code doesn't rely on this javascript file at all. Would this be a good way to do that? $(function(){ ... ... $('head').append('<script type="text/javascript" src="/largejs.js"></script>'); });

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  • admob for webos/palm

    - by Aswan
    Hi Folks i want integrate admob ads to my palm pre application.can you please suggest me and share integration code for ads.some where i found code it wont work for me Thanks in Advance Aswan

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  • Put Java Threading Class into a separate class

    - by erlord
    Consider following SWT code example: http://dev.eclipse.org/viewcvs/index.cgi/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet151.java?view=co How can I separate the inline defined class? Thread thread = new Thread() { public void run() { ... } }; I want to define a separate class which updates the table just like it does here. How do I pass the list back to the table? Example code?

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  • specific draggable is above a specific droppable

    - by hopes
    Hi everyone, I am a begginer in JQuery and I want to make a simple matching quiz so I used this code to create the qustions div and answers div The Capital of KSA The Capital of UK The Capital of USA Riyadh London Washington I want to know after submit button is clicked if all accepted draggables are now dragged to the suitable droppables I used this code to make the answers divs draggable and to make them accepted for their questions divs $(function() { $("#a3").draggable(); $("#q3").droppable({ accept: '#a3', }); }); your help will be appreciated :)

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  • Getting instance crashes on IntelliJ IDEA with scala plugin.

    - by egervari
    I am building a scala web project using scala test, lift, jpa, hibernate, mercurial plugin, etc. I am getting instant crashes, where the ide just bombs, the window shuts down, and it gives no error messages whatsoever when I am doing any amount of copy/pasting of code. This started happening once my project got to about 100 unit tests. This problem is incredibly annoying, because when the crash happens, 30-60 seconds of activity is not saved. Even IDEA will forget which files were last opened and will forget where the cursor was, which makes it really hard to continue where you left off after the crash. A lot can happen in 60 seconds! Now, I've given up, because it seems like all sorts of things cause the IntelliJ IDEA to crash over and over. For example, if I were to copy and paste this code, to write a similar test for another collection type, it would crash shortly after: it should "cascade save and delete status messages" in { val statusMessage = new StatusMessage("message") var user = userDao.find(1).get user.addToStatusMessages(statusMessage) userDao.save(user) statusMessage.isPersistent should be (true) userDao.delete(user) statusMessageDao.find(statusMessage.id) should equal (None) } There is nothing special about this piece of code. It's code that is working just fine. However, IDEA bombs shortly after I paste something like this. For example, I might change StatusMessage to the new class I want to test cascading on... and then have to import that class into the test... and BOOM... it crashed. On windows 7, the IDEA window literally just minimizes and crashes with no warning. The next time I startup IDEA, it has no memory of what happened. Now, I've had this problem before. I posted it way back on IDEA's YouTrack. I was told to invalidate my caches. That never fixed it then, and it's not fixing it now. Please help. This error is fairly random, but it's happening constantly now. I could program for hours and not see it before... and the fact that my work just gets destroyed and I can't remember what I did during the last minute causes me to swear at my monitor at a db level higher than my stereo can go.

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  • How to implement a tagging plugin for jQuery

    - by anxiety
    Goal: To implement a jQuery plugin for my rails app (or write one myself, if necessary) that creates a "box" around text after a delimiter is typed. Example: With tagging on SO, the user begins typing a tag, then selects one from the drop-down list provided. The input field recognizes that a tag has been selected, puts a space and then is ready for the next tag. Similarly, I am attempting to use this plugin to put a box around the previously entered tag before moving to to accept the next tag/input. The instructions in the README.txt seem simple enough, however I have been receiving a $(".tagbox").tagbox is not a function error when debugging my app with firebug. Here is what I have in my application.js: $(document).ready( function(){ $('.tagbox').tagbox({ separator: /\[,]/, // specifying comma separation for <code>tags</code> }); }); And here is my _form.html.erb: <% form_for @tag do |f| %> <%= f.error_messages %> <p> <%= f.label :name %><br /> <%= text_field :tag, :name, { :method => :get, :class => "tagbox" } %> </p> <p><%= f.submit "Submit" %></p> <% end %> I have omitted some other code (namely the implementation of an autocomplete plugin) existing within my _form.html.erb and application.js for sake of readability. The inclusion or exclusion of this omitted code does not affect the performance of this plugin. I have included all of the necessary files for the tagbox plugin (as well as application.js after all other included JS files) within the javascript_include_tag in my application.html.erb file. I'm pretty much confused as to why I'd be getting this "not a function" error when jquery.tagbox.js clearly defines the function and is included in the head of my html page in question. I've been struggling with this plugin for longer than I'd like to admit, so any help would really be appreciated. And, of course, I'm open to any other plugins or from-scratch suggestions you may have in mind.. This tagbox plugin does not seem to have a wealth of documentation or any currently working examples. Also to note, I'm trying to avoid using jrails. Thanks for your time

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  • Is this BlockingQueue susceptible to deadlock?

    - by unforgiven3
    I've been using this code as a queue that blocks on Dequeue() until an element is enqueued. I've used this code for a few years now in several projects, all with no issues... until now. I'm seeing a deadlock in some code I'm writing now, and in investigating the problem, my 'eye of suspicion' has settled on this BlockingQueue<T>. I can't prove it, so I figured I'd ask some people smarter than me to review it for potential issues. Can you guys see anything that might cause a deadlock in this code? public class BlockingQueue<T> { private readonly Queue<T> _queue; private readonly ManualResetEvent _event; /// <summary> /// Constructor /// </summary> public BlockingQueue() { _queue = new Queue<T>(); _event = new ManualResetEvent(false); } /// <summary> /// Read-only property to get the size of the queue /// </summary> public int Size { get { int count; lock (_queue) { count = _queue.Count; } return count; } } /// <summary> /// Enqueues element on the queue /// </summary> /// <param name="element">Element to enqueue</param> public void Enqueue(T element) { lock (_queue) { _queue.Enqueue(element); _event.Set(); } } /// <summary> /// Dequeues an element from the queue /// </summary> /// <returns>Dequeued element</returns> public T Dequeue() { T element; while (true) { if (Size == 0) { _event.Reset(); _event.WaitOne(); } lock (_queue) { if (_queue.Count == 0) continue; element = _queue.Dequeue(); break; } } return element; } /// <summary> /// Clears the queue /// </summary> public void Clear() { lock (_queue) { _queue.Clear(); } } }

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  • How would one rotate an image around itself using Canvas?

    - by Wolfr
    I'm having trouble roating an image around itself using Canvas. Since you can't rotate an image you have to rotate the canvas: if I rotate the canvas by a degree the origin around which I want to rotate changes. I don't get how to track this change. This is my current code: http://pastie.org/669023 And a demo is at http://preview.netlashproject.be/cog/ If you want to give things a shot the zipped up code and image is at http://preview.netlashproject.be/cog/cog.zip

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  • How to set up a simple table view in Cocoa

    - by happyCoding25
    Hello, I was wondering if anyone could give me an example or point me to some example code of how to use an NSTableView. I know how to use it in core data but I would like to do this just using plain cocoa code. All I need is a simple add and remove button. Also is it possible to have cocoa write the data to a text file or plist? Thanks for any help

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  • popups in asp.net

    - by Surya sasidhar
    hi, i want to display the pop ups in asp.net page like how the stack over flow show the pop ups on the top of the site (you get the new answer for the question like that in a orange color) how can i write the code is there any free source code or any reference. thank you

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  • What is the proper HTTP response to send for requests that require SSL

    - by dasil003
    I'm designing an RESTful API where some calls are public over HTTP, and some require an API key and encryption over HTTPS. I'm deliberating on what response code should be sent if an HTTP request is sent to one of the private resources. So far the only one that jumps out at me is 412 - Precondition Failed, but the standard indicates that the precondition is imposed by the requester not the server. Is there an appropriate response code for this condition or do I just need to give in and do 400?

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  • C# Visual Studio Unit Test, Mocking up a client IP address

    - by Jimmy
    Hey guys, I am writing some unit tests and I'm getting an exception thrown from my real code when trying to do the following: string IPaddress = HttpContext.Current.Request.UserHostName.ToString(); Is there a way to mock up an IP address without rewriting my code to accept IP address as a parameter? Thanks!

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  • Java Socket Connection is flooding network OR resulting in high ping

    - by user1461100
    i have a little problem with my java socket code. I'm writing an android client application which is sending data to a java multithreaded socket server on my pc through direct(!) wireless connection. It works fine but i want to improve it for mobile applications as it is very power consuming by now. When i remove two special lines in my code, the cpu usage of my mobile device (htc one x) is totally okay but then my connection seems to have high ping rates or something like that... Here is a server code snippet where i receive the clients data: while(true) { try { .... Object obj = in.readObject(); if(obj != null) { Class clazz = obj.getClass(); String className = clazz.getName(); if(className.equals("java.lang.String")) { String cmd = (String)obj; if(cmd.equals("dc")) { System.out.println("Client "+id+" disconnected!"); Server.connectedClients[id-1] = false; break; } if(cmd.substring(0,1).equals("!")) { robot.keyRelease(PlayerEnum.getKey(cmd,id)); } else { robot.keyPress(PlayerEnum.getKey(cmd,id)); } } } } catch .... Heres the client part, where i send my data in a while loop: private void networking() { try { if(client != null) { .... out.writeObject(sendQueue.poll()); .... } } catch .... when i write it this why, i send data everytime the while loop gets executed.. when sendQueue is empty, a null "Object" will be send. this results in "high" network traffic and in "high" cpu usage. BUT: all send comments are received nearly immediately. when i change the code to following: while(true) ... if(sendQueue.peek() != null) { out.writeObject(sendQueue.poll()); } ... the cpu usage is totally okay but i'm getting some laggs.. the commands do not arrive fast enough.. as i said, it works fine (besides cpu usage) if i'm sending data(with that null objects) every while execution. but i'm sure that this is very rough coding style because i'm kind of flooding the network. any hints? what am i doing wrong?? Thanks for your Help! Sincerly yours, maaft

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  • What version of Apache HTTP Client is bundled in Android 1.6?

    - by Benju
    I want to have a seperate project that runs my server communication code in a normal JVM for the purposes of integration testing. This code uses these libraries which are build into the Android Framework... http://developer.android.com/reference/org/apache/http/client/package-summary.html Does anybody know what version of Apache HTTP Client this is supposed to be? I want to run it without the Android tests which are painfully slow.

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  • How would you write a program to find the shortest pangram in a list of words?

    - by jonathanasdf
    Given a list of words which contains the letters a-z at least once, how would you write a program to find the shortest pangram counted by number of characters (not counting spaces) as a combination of the words? Since I am not sure whether short answers exist, this is not code golf, but rather just a discussion of how you would approach this. However, if you think you can manage to write a short program that would do this, then go ahead, and this might turn into code golf :)

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  • VS2010 debugger always breaks

    - by Paul Knopf
    In VS2010, I set a break point (from the left gutter of the editor) on a line of code. After I removed the break point, the debugger always breaks on that line of code. After starting visual studio, the debugger still breaks at the point. Thanks in advance!

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  • How to use web camera in android emulator to capture a live image?

    - by Kumar
    Hi,As far as i know, Android emulator doesn't have a camera .To capture a live image we have to use web camera.I have seen code in this web site "http://www.tomgibara.com/android/camera-source" to use web camera in android emulator to capture a image but, i don't how to use this code.I am new to this field , can any one help me how to do it. regards, s.kumaran.

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  • openDatabase Hello World

    - by cf_PhillipSenn
    I'm trying to learn about openDatabase, and I think this I'm getting it to INSERT INTO TABLE1, but I can't verify that the SELECT * FROM TABLE1 is working. <html> <head> <script src="http://www.google.com/jsapi"></script> <script type="text/javascript"> google.load("jquery", "1"); </script> <script type="text/javascript"> var db; $(function(){ db = openDatabase('HelloWorld'); db.transaction( function(transaction) { transaction.executeSql( 'CREATE TABLE IF NOT EXISTS Table1 ' + ' (TableID INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ' + ' Field1 TEXT NOT NULL );' ); } ); db.transaction( function(transaction) { transaction.executeSql( 'SELECT * FROM Table1;',function (transaction, result) { for (var i=0; i < result.rows.length; i++) { alert('1'); $('body').append(result.rows.item(i)); } }, errorHandler ); } ); $('form').submit(function() { var xxx = $('#xxx').val(); db.transaction( function(transaction) { transaction.executeSql( 'INSERT INTO Table1 (Field1) VALUES (?);', [xxx], function(){ alert('Saved!'); }, errorHandler ); } ); return false; }); }); function errorHandler(transaction, error) { alert('Oops. Error was '+error.message+' (Code '+error.code+')'); transaction.executeSql('INSERT INTO errors (code, message) VALUES (?, ?);', [error.code, error.message]); return false; } </script> </head> <body> <form method="post"> <input name="xxx" id="xxx" /> <p> <input type="submit" name="OK" /> </p> <a href="http://www.google.com">Cancel</a> </form> </body> </html>

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