Re: Basic Socket

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Fri, 5 Oct 2007 11:55:31 -0400
"Lamefif" <> wrote in message

well no, i amended the code to what you suggested, ie WSAAsyncSelect()
before listen():
        WSAAsyncSelect (s, hwnd, MY_MESSAGE_NOTIFICATION, (FD_ACCEPT
int tempi = listen(s, SOMAXCONN);
   //Don't forget to clean up with CloseConnection()!
::MessageBox(NULL,"Done Listening ", "Got Request..", MB_OK);

listen returns 0 i.e no errors, that means a connection has happened
then FD_CONNECT should trigger now

Your are creating a nonblocking (i.e. async) socket but coding as if it was
a blocking socket. For a nonblocking socket listen returns 0 to indicate
that it is listening. Closing the socket at this point is a design error.
After it returns you would normally return to your message pump to await the
notification. In this case the notification would be FD_ACCEPT, not

Study the winsock FAQ to understand the difference between blocking and
nonblocking sockets, and the sequence of the notifications:

Scott McPhillips [VC++ MVP]

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