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any help/feedback would be appreciated. I'm developing a broadcast client receiver such that it receives data coming from the server. the client sends and receives data ASYNCHRONOUSLY. in other words i make use of methods such as socket.BeginReceiveFrom() and socket.BeginSendTo() however, i would like to somehow get the IP ADDRESS of the server, but when i use the method RemoteEndPoint() to get the IP address of the server i get errors. Part of the code is shown below.

private void Form1_Load(object sender, EventArgs e) {
    byteData = msgToSend.ToByte();

    clientSocket.BeginSendTo(byteData, 0, byteData.Length, SocketFlags.None, epServer, new AsyncCallback(OnSend), null);

    byteData = new byte[1024];
    //Start listening to the data asynchronously
    clientSocket.BeginReceiveFrom (byteData,0, byteData.Length,SocketFlags.None,ref epServer,new AsyncCallback(OnReceive),null);
}

private void OnReceive(IAsyncResult ar) {            
    try {                
        clientSocket.EndReceive(ar);
        byteData = new byte[1024];

        // HERE MY CODE TO FIND THE IP ADDRESS OF THE SERVER
        IPEndPoint ip = (IPEndPoint)epServer.RemoteEndPoint;
        MessageBox.Show(Convert.ToString(ip.Address));

        //Start listening to receive more data from the user
        clientSocket.BeginReceiveFrom(byteData, 0, byteData.Length,             SocketFlags.None, ref epServer,new AsyncCallback(OnReceive), null);
    } catch (ObjectDisposedException) { 

    } catch (Exception ex) {
        MessageBox.Show(ex.Message, "SGSclient: " + strName, MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}
Jake1164
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Carlitos Overflow
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    I believe this is an extension of your previous question: http://stackoverflow.com/questions/7842443/asynchronous-client-broadcast-receiver/7853129#7853129 The answer I provided there will should allow you to get the server's IP – robowahoo Oct 24 '11 at 13:40
  • Thx robowahoo, i just saw my error in the code you show in the link. instead of EndReceived() method, i used EndReceiveFrom() which returns the end point. – Carlitos Overflow Oct 24 '11 at 15:26

1 Answers1

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You get the error since your are mixing TCP and UDP.

EndReceive is used for connection based protocols. As are the RemoteEndPoint property.

You should invoke EndReceiveFrom which also returns the remote end point

jgauffin
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