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POC#: UDP Listener Thread
 

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    <p>I want to use UDP-Sockets for my XNA-Networkgame. And now I am trying to code a reliable Listenerthread, but there are some Problems.</p> <p>If I use socket.Receive it will wait until a packet. This is fine for my Listenerthread. My thread has a while-loop like this:</p> <pre><code>while(Listen == true) { socket.Receive(...); } </code></pre> <p>But if I swap the Listen-Flag to false (if I want to stop listening), it will stuck in the last .Receive().</p> <p>Then I looked at the Methodes .BeginReceive(). It will call a methode if a packet arrived. But to receive the data I have to use .EndReceive() and that is the point I have a problem with. I want to still listen for packets and don't stop listening if a packet is arriving.</p> <p>So I still use the blocking version with ".Receive()". I could force the listening thread to cancel by calling: Thread.abort(), but this is not good.</p> <p>Currently I test if data is available:</p> <pre><code>while(Listen == true) { if(socket.Available &gt; 0) { socket.Receive(...); } } </code></pre> <p>But I think this isn't the best way... If shortly after the if-clause a other thread is calling socket.Receive(..) it will stuck unintentional again. Is there no way to cancel the .Receive(..) method? I tried to set a timeout, but if .Receive timesout, it will throw an exception...</p> <p>I want a simple udp-listening-thread, I can stop gracefully. :-) In MSDN I didn't find a listener-example which is listening for more than one packet. How handle other programmer this?</p>
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    1. CO"If shortly after the if-clause a other thread is calling socket.Receive(..) " -- this seems to imply that there are multiple threads reading from the same socket?
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    2. CONo, i dont do that. But it is possible and i want to avoid that :-)
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    3. COWhen you are ready to stop listening, close the socket. The blocking `Receive()` method will exit with a `SocketException` that you'll need to catch.
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      1. POC#: UDP Listener Thread
      1. USMatt Davis
 

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