windows 7.x移动设备中的UDP接收

本文关键字：UDP 接收 移动 windows | 更新日期: 2023-09-27 17:58:06

我在使用Windows Mobile时遇到问题。

我正在编写一个代码，用于从windows服务器应用程序（由我创建）接收UDP数据，该应用程序广播数据，但当windows应用程序执行时，我遇到了一个可怕的问题：

提供了无效参数

当套接字CCD_ 1功能工作时。

有人能帮我吗？

---这是代码

public string Receive(int portNumber)
        {
            string response = "Operation Timeout";
            // We are receiving over an established socket connection
            registerSocket();
            if (_socket != null)
            {
                // Create SocketAsyncEventArgs context object
                SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
                socketEventArg.RemoteEndPoint = new IPEndPoint(IPAddress.Any, portNumber);
                // Setup the buffer to receive the data
                socketEventArg.SetBuffer(new Byte[MAX_BUFFER_SIZE], 0, MAX_BUFFER_SIZE);
                // Inline event handler for the Completed event.
                // Note: This even handler was implemented inline in order to make this method self-contained.
                socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
                {

                    if (e.SocketError == SocketError.Success)
                    {
                        // Retrieve the data from the buffer
  response = Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred);
                        response = response.Trim(''0');
                    }
                    else
                    {
                        response = e.SocketError.ToString();
                    }
                    _clientDone.Set();
                    _socket.ReceiveFromAsync(socketEventArg);
                });
                // Sets the state of the event to nonsignaled, causing threads to block
                _clientDone.Reset();
                // Make an asynchronous Receive request over the socket
                **_socket.ReceiveFromAsync(socketEventArg);**   // here the issue arises An     //invalid argument was supplied
                // Block the UI thread for a maximum of TIMEOUT_MILLISECONDS milliseconds.
                // If no response comes back within this time then proceed
                _clientDone.WaitOne(TIMEOUT_MILLISECONDS);
            }
            else
            {
                response = "Socket is not initialized";
            }
            return response;
        }

windows 7.x移动设备中的UDP接收

我找到了解决方案。

要接收Udp多播，您应该在接收之前调用_socket.Bind(IPEndpoint)，并使用_socket.ReceiveAsync()而不是_socket.ReceiveFromAsync()。此外，socketEventArg.RemoteEndpoint应为空。

这个代码对我有效：

        _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        SocketAsyncEventArgs args = new SocketAsyncEventArgs();
        args.SetBuffer(new byte[MAX_BUFFER_SIZE], 0, MAX_BUFFER_SIZE);
        args.Completed += args_Completed;
        _socket.Bind(new IPEndPoint(IPAddress.Any, **your port**));
        _socket.ReceiveAsync(args);
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