UdpClient 接收直到第二次广播才返回

发布于 2024-10-15 09:35:33 字数 528 浏览 6 评论 0原文

我觉得这真的很奇怪。尝试使用UdpClient同步接收广播消息，但广播完成却没有返回。直到后来的广播中我才收到消息。我认为框架内某个地方存在错误？

clientListener.BeginReceive(new AsyncCallback(RxBcastCallback), clientListener);
//this is passed as AsyncCall.AsyncState in the callback

.....

UdpClient udpListener = (UdpClient)AsyncCall.AsyncState;        

IPEndPoint remoteEndPt = new IPEndPoint(IPAddress.Any, 0);

byte[] inBuffer = udpListener.Receive(ref remoteEndPt); 
//does not return until subsequent broadcast

谢谢，肯尼

原文

I think this is really weird. Tried to use UdpClient to synchronously receive broadcast msg, but it does not return although the broadcast has completed. Only on subsequent broadcast did I get the message. I think there's a bug somewhere within the framework?

clientListener.BeginReceive(new AsyncCallback(RxBcastCallback), clientListener);
//this is passed as AsyncCall.AsyncState in the callback

.....

UdpClient udpListener = (UdpClient)AsyncCall.AsyncState;        

IPEndPoint remoteEndPt = new IPEndPoint(IPAddress.Any, 0);

byte[] inBuffer = udpListener.Receive(ref remoteEndPt); 
//does not return until subsequent broadcast

thanks,
Kenny

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箜明 2024-10-22 09:35:33

您的回调端点可能应该是：

UdpClient udpListener = (UdpClient)AsyncCall.AsyncState;
IPEndPoint e = (IPEndPoint)((UdpState)(AsyncCall.AsyncState)).e;
byte[] inBuffer= udpListener.EndReceive(AsyncCall, ref e);

Your callback endpoint should probably be:

UdpClient udpListener = (UdpClient)AsyncCall.AsyncState;
IPEndPoint e = (IPEndPoint)((UdpState)(AsyncCall.AsyncState)).e;
byte[] inBuffer= udpListener.EndReceive(AsyncCall, ref e);

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