Question

Please note the question is about using an asynchronous callback mode only on sockets!

I want to build a TCP client that will notify me when a packet is received and when i the socket is being closed,because the feautures that NET offers with beginRecv,endRecv doesn’t inform if the connection is still available.

My question: Isn’t there a way to create a TCP client much like using WinAPI?

I mean calling WSAAsyncSelect with a message,when the message is received it calls the function you’ve called in WSAAsyncSelect and then you can see whether the connection is closed or there’s a new packet through the WParams FD_CLOSE FD_READ FD_WRITE.

If there isn’t.Can’t I control my connection and my incoming packets at the same time? I don’t want to call BeginRecv EndRecv all the time. -.-

Thanks in advance!

Answer 1

If you pass a state object which includes a reference to your socket, You’ll have access to the socket itself.

public class SocketState {   public SocketState(Socket s)   {     this._socket = s;   }     private Socket _socket;    public Socket Socket    {      get{return _socket;}    } }   void SomeFunction() { //do some stuff in your code  SocketState stateObject = new SocketState(mySocket); mySocket.BeginReceive(buffer, offset, size, flags, CallBack, stateObject); //do some other stuff }  public void CallBack(IAsyncResult result) {   SocketState state = (SocketState)result.AsyncState;   state.Socket.EndReceive(result);    //do stuff with your socket.   if(state.Socket.Available)     mySocket.BeginReceive(buffer, offset, size, flags, CallBack, state); }