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MFC: CSocket

Posted on 1998-01-12
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Last Modified: 2013-11-20
Basically I am coming from using the native windows api and the native winsock api so please bear with me.  

This is my first mfc application.

I want to have an mfc application use the CAsyncSocket class to listen for connections.  And when various network events happen such as FD_ACCEPT, it to send a message to the window so that I can accept the connection.  But how can I get it to do this?  There doesn't seem to be any functionallity in the class which lets me tell it to notify this window.  I have tried using the WSAAsyncSelect to specify the m_hWnd member of the window class to notify me of FD_ACCEPT events, but it doesn't work.  It could be a problem with the way I try and receive the message.  I added the ON_MESSAGE(FD_ACCEPT,OnAccept) statement to the message map for that window.  Is that right? Can CAsyncSocket do this for me?  Any help would be greatly appreciated.
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Question by:tlsoftware
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Yores earned 50 total points
ID: 1313946
Hi,

    I am also new in writing CSocket program with MFC.
    Let's share our experience.
    In you case, you said that you don't know which function
is active when a call connect to your computer(server).
    Actually, there are a function handle this case :

CListeningSocket::CListeningSocket(CServerDoc* pDoc)
{
      m_pDoc = pDoc;
}

/////////////////////////////////////////////////////////////////////////////
// CListeningSocket Overridable callbacks

void CListeningSocket::OnAccept(int nErrorCode)
{
      CSocket::OnAccept(nErrorCode);
      m_pDoc->ProcessPendingAccept();
}

    As shown, a function of CSocket::OnAccept() will active
when someone connect to your program.
    For more detail about this source code, please see the
sample file in visual c++ package.


Yores
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Author Comment

by:tlsoftware
ID: 1313947
I have been looking at the same example.  CListenSocket is a class defined by the example in the source file lstnsock.cpp.  But I still can't figure out how the window knows when a connection is accepted.  Nowhere does it seem to specify: hey send this message here.  There is an OnAccept function, but who calls that?  If you know what I am talking about and figure it out, it would help me out a lot!
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Expert Comment

by:jtwine100697
ID: 1313948
  If you are wondering how to get the notification messages, you do not get them.  The CAsyncSocket class creates its own (hidden) window to catch the async notification messages, it then calls the OnXxxx() functions defined in the class.

   The ideal way to use this class is to derive a new class from it, and override the OnXxxxx() functions (CAsyncSocket::OnAccept(), CAsyncSocket::OnSend(), etc).

   When a connection is ready to be accepted, the Winsock API sends the message to the CAsyncSocket object, which in turn calls the OnAccept() function.  Get it?

   Is that what you are looking for?

-=- James.

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