Question

I have this code. I can receive data from my client successfully, but only one time. After I receive the data once, if the client attempts to send any more the server isn’t receiving it. Can anyone help?

    private void startListening()
    {
        TcpListener server = null;


        try
        {

            server = new TcpListener(IPAddress.Parse("127.0.0.1"), 7079);

            server.Start();

            Byte[] bytes = new Byte[256];
            String data = null;

            //Enter listening loop
            while (true)
            {

                addLog("Waiting for push.");

                TcpClient client = server.AcceptTcpClient();
                addLog("Push request received, accepted.");

                data = null;

                NetworkStream stream = client.GetStream();

                int i;

                //Loop to receive all data
                while((i = stream.Read(bytes, 0, bytes.Length))!=0)
                {
                    //Translate data bytes to ASCII string
                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);

                    //Process data
                    data = data.ToUpper();

                    byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);

                    //send response
                    stream.Write(msg, 0, msg.Length);
                    addLog("Received: '" + data + "'");
                }

                //End ALL Connections
                client.Close();
                server.Stop();
            }
        }
        catch(SocketException e)
        {
            addLog("SocketException: " + e);
        }
        finally
        {
            //Stop listening for new clients
            MessageBox.Show("Finished.");
        }
    }

Answer 1

You are closing both the server and the client in the end of your loop (server.Stop();). Your outer loop will keep going and try to get a new TcpClient from your server (which would mean a new connection is made) but since you’ve already stopped the server then that will never happen (or probably throw an exception).