Re: Socket programming, Server with multiple clients & ports

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 06 Mar 2007 07:41:05 -0500

Message-ID:

<#t0frz#XHHA.3928@TK2MSFTNGP03.phx.gbl>

sirisha wrote:

hi,

I am developing a chat server in vc++ 6.0, which will be accessed by
multiple clients simultaneously. I think I need to use threads to get
this worked. The problem is I have to keep a port always in the
listening state and when the client is requesting for connection, I
need to create the connection Socket with the new port number.

I am able to connect with multiple clients with single port number
maintained at server. But when I create the new socket with new port
it is unable to get connected to client. What should I do if need to
do this? Could anyone help me in this issue.

There is no concept of a "new port number" for the connecting socket.
What are you doing to attempt to do that?

If you are using CAsyncSocket your listener OnAccept function should do
something like

CMySocket* psocket = new CMySocket();
CAsyncSocket::Accept(*psocket);

With CAsyncSocket you do not need multiple threads. But if you use
multiple threads you must use the Detach and Attach methods to "move"
the connected socket into the secondary thread, and the secondary thread
must be a so-called user-interface type of MFC thread, as shown here:
http://support.microsoft.com/kb/175668

--
Scott McPhillips [VC++ MVP]