Question

I’m completely new to socket programming with C#, I’m trying to get two running .exes to talk to eachother:

static void Main(string[] args) {
    bool sender = !false;
    if (args.Length > 0) sender = !true;
    if (sender) {
        try {
            Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
            IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8221);
            sock.Connect(ipe);
            while (true) {
                string toSend = Console.ReadLine();
                sock.Send(Encoding.UTF32.GetBytes(toSend));
            }
        }
        catch (SocketException e) {
            Console.WriteLine(e.Message);
            Console.ReadLine();
        }
    }
    else {
        try {
            Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
            IPEndPoint ipe = new IPEndPoint(IPAddress.Any, 8221);
            sock.Bind(ipe);
            sock.Listen(4);
            while (true) {
                if (!sock.Connected) continue;
                byte[] buffer = new byte[1024];
                if (sock.Receive(buffer) > 0) Console.WriteLine(Encoding.UTF32.GetString(buffer));
            }
        }
        catch (SocketException e) {
            Console.WriteLine(e.Message);
            Console.ReadLine();
        }
    }
}

At the moment though, both programs run without error, but they don’t seem to connect (if (!sock.Connected) always is true).

Please help, thank you.

Answer 1

No where in your server code you are accepting the incoming connections. You will have to accept and create a socket at the server end for the new incoming clients.

Socket newSock = sock.Accept();
if (!newSock.Connected) continue;
else
{...}