Basic Socket

From:
 Lamefif <Leonardo.Pjetri@googlemail.com>
Newsgroups:
microsoft.public.vc.language
Date:
Fri, 05 Oct 2007 11:27:41 -0000
Message-ID:
<1191583661.005808.64500@19g2000hsx.googlegroups.com>
im following this article here not quite getting it to work :(
http://www.codeproject.com/internet/beginningtcp_cpp.asp
the problem is i dont' seem to be getting any of these events
FD_ACCEPT | FD_CONNECT |FD_READ | FD_CLOSE

which are suppose to be triggered by this line:
 WSAAsyncSelect (s, hwnd, MY_MESSAGE_NOTIFICATION, (FD_ACCEPT |
FD_CONNECT |FD_READ | FD_CLOSE)); in ListenOnPort(int portno, HWND
hwnd)
i've set it up so that every time a key is pressed the ListenOnPort()
is called.

Listening for connection code:
int ListenOnPort(int portno, HWND hwnd)
{
    SOCKET s;
    WSADATA w;
    int error = WSAStartup (0x0202, &w); // Fill in WSA info

    if (error)
    {
        return false; //For some reason we couldn't start Winsock
    }

    if (w.wVersion != 0x0202) //Wrong Winsock version?
    {
        WSACleanup ();
        return false;
    }

    SOCKADDR_IN addr; // The address structure for a TCP socket

    addr.sin_family = AF_INET; // Address family
    addr.sin_port = htons (portno); // Assign port to this socket

    //Accept a connection from any IP using INADDR_ANY
    //You could pass inet_addr("0.0.0.0") instead to accomplish the
    //same thing. If you want only to watch for a connection from a
    //specific IP, specify that //instead.
    addr.sin_addr.s_addr = htonl (INADDR_ANY);

    s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP); // Create socket

    if (s == INVALID_SOCKET)
    {
        return false; //Don't continue if we couldn't create a //
socket!!
    }

    if (bind(s, (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR)
    {
       //We couldn't bind (this will happen if you try to bind to the
same
       //socket more than once)
        return false;
    }

    //Now we can start listening (allowing as many connections as
possible to
    //be made at the same time using SOMAXCONN). You could specify
any
    //integer value equal to or lesser than SOMAXCONN instead for
custom
    //purposes). The function will not //return until a connection
request is
    //made

     int tempi = listen(s, SOMAXCONN);
     WSAAsyncSelect (s, hwnd, MY_MESSAGE_NOTIFICATION, (FD_ACCEPT |
FD_CONNECT |FD_READ | FD_CLOSE));

    //Don't forget to clean up with CloseConnection()!
    closesocket(s);
    ::MessageBox(NULL,"Done Listening ", "Got Request..", MB_OK);

}

//--------------

Look out for the events code:

    switch (message)
    {
        case MY_MESSAGE_NOTIFICATION: //Is a message being sent?
        {
            switch (lParam) //If so, which one is it?
            {
            case FD_ACCEPT:
                ::MessageBox(NULL,"Done Listening Event", "Got Request..", MB_OK);
                //Connection request was made
                break;

            case FD_CONNECT:
                ::MessageBox(NULL,"Done Listening Event", "Got Request..", MB_OK);
                //Connection was made successfully
                break;

            case FD_READ:
                //Incoming data; get ready to receive
                break;

            case FD_CLOSE:
                //Lost the connection
                ::MessageBox(NULL,"Done Listening Event", "Got Request..", MB_OK);
                break;
            }
        }
        break;

    case WM_KEYDOWN:
        ListenOnPort(888, hWnd);
        break;
...

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