Thread: Multiple Clients Winsock

Heya.

I managed to do a simple client-server-chat thingie... now I'm trying to make it for several clients at once (5 to begin with... mebbe more later when I get it to work!)


well my question is, do I have to make my server application multithreaded to do that, or is it possible somehow to do it in 1 thread.

say, have a loop that loops through the clients using the SAME socket evrytime and looking if they're sending / requesting sumthin... whoa... it's really causing me some headaches


Thanks,

PrivatePanic

Well thanks for the advice!

I know now I have to fill a fd_set struct with all the client's sockets...

but I don't know how to implement the select-function, or, in other words, where in my code I have to call it.

I'm using WSAAsyncSelect to have an user Msg called when socket events occur, btw.

If you'd give me a further hint how/where to insert the select function to do the task I need it for, I'd be very grateful

Here my routine to react on the socket events so far:

Code:

...

  case WM_ONSOCKET:

    if (WSAGETSELECTERROR(lParam))
    { // error
      WSACleanup ();
      return 0;
    }
 
    switch (WSAGETSELECTEVENT(lParam))
    {
      case FD_READ:
	char readbuff[2000];
	int  rlen;

	rlen = recv(cli_sock,readbuff,2000,0);
	readbuff[rlen] = 0;
	strcat(readbuff,"\r\n");

        send(cli_sock, readbuff, rlen, 0);	

      break;

      case FD_ACCEPT:
	char pszTemp[255];

	sprintf(pszTemp, "A client sends a connection attempt.\r\n" );
	OutputLine(hEdit, pszTemp);

	int ilen; ilen = sizeof(cli_addr);
	cli_sock = accept( serv_sock, (struct sockaddr*)&cli_addr, &ilen );

	sprintf(pszTemp, "Client connected [IP:%s][S:%d]\r\n", inet_ntoa(cli_addr.sin_addr), (INT) cli_sock );
	OutputLine(hEdit, pszTemp);
      break;

      case FD_CLOSE:
	OutputLine(hEdit, "Client disconnected!\r\n");
      break;

    }
    break;

......

cli_sock is the Client's socket. OutputLine is just an own-written function to CAT a string into an edit control.

Thanks for the advice with the wParam of FD_READ, let's see how far this brings me


well I'm planning to do a simple multiplayer text-only game so there's no time critical stuff going to be.


Thanks anyway, great help so far!

glad i could be of service