Wndproc

I couldn't understand how WNDPROC(in WNDCLASS) works. How can i make a callback function similar to that? Please advice.

You'll have to re-phrase that question to get a decent response

LRESULT CALLBACK my_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
switch(msg) {


}

return ;
}



WNDCLASS wndclass;
memset(&wndclass, 0, sizeof(WNDCLASS));
...
wndclass.lpfnwndproc = my_wndproc;

ARGH! i accidently posted the unfinished reply... AND I COULD'NT EDIT IT... >_<

ok, again:

//this is your wnd proc
//whenever your window receives a message, this function will be called (as long as you call DispatchMessage( ... )
LRESULT CALLBACK my_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam) {
switch(msg) {
//handle the message
}
}

return 0; //hm... should we return 0 if we processed the message or if we didn't? --- i am not sure now but you can rtfm :)
}



WNDCLASS wndclass;
memset(&wndclass, 0, sizeof(WNDCLASS));
...
wndclass.lpfnWndproc = my_wndproc; //every window created with this windowclass will have my_wndproc as it's window procedure.

so thats how to declare a callback function

Thanks, Raven Arkadon.
I know how to program using the WNDCLASS. I wanna know what's behind the WNDCLASS and WndProc. How can i make a call back function which has the same 'magic' as WndProc?

Quote:

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Originally posted by Unregistered
Thanks, Raven Arkadon.
I know how to program using the WNDCLASS. I wanna know what's behind the WNDCLASS and WndProc. How can i make a call back function which has the same 'magic' as WndProc?

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The WNDCLASS is just a structure of information sent to RegisterClass to allow you to create windows using those styles.....

The WndProc is a simple call back that can be defined however you want as long as it's declared. You include a pointer to this function in your WNDCLASS

Code:

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LRESULT CALLBACK my_wndproc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)

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Meaning a function that recieves 4 32bit params. It returns an LRESULT and as a callback, allows the system to call it....

That's all that's needed.......the rest you can define yourself

Quote:

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I wanna know what's behind the WNDCLASS and WndProc. How can i make a call back function which has the same 'magic' as WndProc

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I think that means "how do you use function pointers"...

Try this site:
http://www.function-pointer.org/