Thread: winsock problem...

  1. #1
    * Death to Visual Basic * Devil Panther's Avatar
    Join Date
    Aug 2001

    winsock problem...

    i would like to wite my own telnet client... but my problem is how to make the program to recv() the data... all the time.
    what i mean is how do i now when there is incoming data, so then i could use recv(), because i know that recv() returns zero on connection ternomated, and blocks the connection when there is no incoming data...

    what do i do???

    thanks guys...
    "I don't suffer from insanity but enjoy every minute of it" - Edgar Allen Poe - Developing free software for the community.

  2. #2
    Registered User
    Join Date
    Nov 2001
    One solution is a non-blocking I/O model.

    I highly recommend Network Programming for Microsoft Windows, Second Edition by Anthony Jones and Jim Ohmund.


  3. #3
    Registered User Xei's Avatar
    Join Date
    May 2002

    What I did...

    What I did was create a DLL to handle any internet connections I wanted, and I incorporated its own callback functions. So what it does is create a thread per socket, then that thread monitors the socket using WSAWaitForMultipleEvents, and WSAEnumNetworkEvents to find out which activity has occured. Afterwards it just sends that data to a function defined by the Win32 application, then it can use another function in the DLL to read the data when it decides to.

  4. #4
    Registered User
    Join Date
    Nov 2001
    In this case, the DLL needs a mean to communicate with the parent process and update the process upon incoming data.

    One solution is to update the DLL with a safe handle of the parent process. As an event triggers WaifForMultipleObjects() or events, the DLL sends a message to the parent process.


  5. #5
    i want wookie cookies the Wookie's Avatar
    Join Date
    Oct 2002
    I think you use "Asyncronous Sockets", I'm not sure of the exact name, but I have some of my winsock code...

    //in your callback function
    LRESULT CALLBACK MainWndProc(HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam) {
    	switch(wMsg)	{
    		case DATA_PENDING:
    			if(LOWORD(lParam) == FD_CLOSE) {	
    				//disconnecting from client
    			//receive data here
    thats the basic code i well for what i need/use it for

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