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...

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.

Kuphryn

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.

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.

Kuphryn

I think you use "Asyncronous Sockets", I'm not sure of the exact name, but I have some of my winsock code...

Code:

---

//in your callback function

LRESULT CALLBACK MainWndProc(HWND hWnd, UINT wMsg, WPARAM wParam, LPARAM lParam) {
        switch(wMsg)        {
                case CONNECTION_PENDING:
                        if(LOWORD(lParam)==8){
                                //accept
                        }
                        break;
                case DATA_PENDING:
                        if(LOWORD(lParam) == FD_CLOSE) {       
                                //disconnecting from client
                        }
                        //receive data here
                break;
        }
}

---

thats the basic code i use..works well for what i need/use it for