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POMethod doesn't work when executed in a thread, but works otherwise - C#
 

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  1. POMethod doesn't work when executed in a thread, but works otherwise - C#
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    <p>I am a beginner in C# and I want to do the following:</p> <pre><code>Thread t = new Thread(new ThreadStart(this.play)); t.Start(); </code></pre> <p>This is the method <code>play</code>:</p> <pre><code> private void play() { playSong("path\\to\\song.mp3"); } private static void playSong(String path) { mciSendString("open \"" + path + "\" type mpegvideo alias MediaFile", null, 0, IntPtr.Zero); mciSendString("play MediaFile", null, 0, IntPtr.Zero); } [DllImport("winmm.dll")] private static extern long mciSendString(string strCommand, StringBuilder strReturn, int iReturnLength, IntPtr hwndCallback); </code></pre> <p>When I execute the method just like this: <code>play();</code>, without using threading, the song plays perfectly, but it doesn't play if I do like in the first code excerpt.</p> <p>I suspect that it happens because I need to call the <code>mciSendString</code> method in the main thread. If so, will someone tell me how can I do that? Or tell me how can I get it working using a thread?</p> <p>I appreciate your help.</p> <p><strong>-- Edited from here --</strong></p> <p>I don't know if I should post the code, cause it is kind of large, but I will reduce it, to show what I want to do:</p> <p>I have a windows forms application that starts a socket listening on a port when it begins, which works as a server. This server receives as requests paths to songs that it'll play. If I use the <code>play</code> method as shown below, the form crashes, but the application still listens to my requests. I understand that I have to do it in the background, so that the form controls won't crash, I just don't know the better way to do it.</p> <pre><code> //Constructor public Main() { InitializeComponent(); play(); } </code></pre> <p><code>play()</code> is something like this:</p> <pre><code> private void play() { //Does the socket initialization do { //... while (true) { //Reads text from client //The text contains a string, indicating the path to the song. byte[] bytesFrom = new byte[10025]; networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize); string dataFromClient = System.Text.Encoding.Default.GetString(bytesFrom); //Plays the song from the received path playSong(dataFromClient); //...Do other stuff } } while (_serverOn); //Closes the socket connection } private static void playSong(String path) { mciSendString("open \"" + path + "\" type mpegvideo alias MediaFile", null, 0, IntPtr.Zero); mciSendString("play MediaFile", null, 0, IntPtr.Zero); } </code></pre>
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    1. USAntonioJunior
    1. USAntonioJunior
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    1. COOne thing to check is that the thread is given time to execute. The primary thread needs to be alive while that one is executing. Can you post a very simple example or the program that has the error please?
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      1. POMethod doesn't work when executed in a thread, but works otherwise - C#
      1. USPreet Sangha
    2. COWhat happens to your main thread after the second thread is started?
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      1. POMethod doesn't work when executed in a thread, but works otherwise - C#
      1. USBrian Rasmussen
    3. COI added more details to my post. I hope that helps solving my problem. Thanks!
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      1. POMethod doesn't work when executed in a thread, but works otherwise - C#
      1. USAntonioJunior
 

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