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I have a system monitor app that needs to listen to messages from various UDP sockets on another machine. The other sockets continuously send heartbeats to this given IP/port.

This exception gets thrown when calling BeginReceiveFrom: "A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied"

I shouldn't have to call connect because data is already getting sent to this ip endpoint. plus the data is coming from various sockets.

    private Socket m_socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        // bind socket
        // Establish the local endpoint for the socket.
        // Dns.GetHostName returns the name of the 
        // host running the application.
        IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
        IPAddress ipAddress = ipHostInfo.AddressList[0];
        m_localEndPoint = new IPEndPoint(ipAddress, 19018);
        m_socket.Bind(m_localEndPoint);

        m_socket.BeginReceiveFrom(m_data, 
                                  m_nBytes, 
                                  MAX_READ_SIZE, 
                                  SocketFlags.None,
                                  ref m_localEndPoint, 
                                  new AsyncCallback(OnReceive),
                                  null);

    }

    private void OnReceive(IAsyncResult ar)
    {
            int nRead = m_socket.EndReceiveFrom(ar, ref m_localEndPoint);
     }
4

2 回答 2

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您的问题是您绑定到分配给您的 IP，您应该绑定到您想要接收的 IP - 在您的情况下：

m_socket.Bind(new IPEndPoint(IPAddress.Any, 12345));
于 2013-05-06T13:15:01.613 回答
0

我能够使用 UdpClient 类获得所需的行为。

于 2013-05-03T01:07:05.907 回答