I'm trying to send a message from one app to another, I got this working before with an InvalidateRect call but it won't seem to work now.

I'm sure the problem is an incorrect window handle but I'm confused by the error code which GetLastError its giving me; an error 183, ALREADY_EXISTS. What already exists, surely I should be getting something like INVALID_HANDLE. Has anyone seen this before, maybe there is somehting else wrong other than the hWnd.
Posted on 2001-10-27 08:05:45 by Eóin
What kind of app are you sending the message to?
Your own assembly program, C, C++, MFC ?

Posted on 2001-10-27 10:54:10 by farrier
Both apps are my own, written in asm. After a reboot the error code changed to 1400, INVALID_WINDOW_HANDLE so that must be the problem then, i wonder why I was geting that bizzare code before the reboot.

Posted on 2001-10-27 11:11:43 by Eóin
Got it, well actually I don't quite understand what I did but it worked. That bizarre error code was actually a warning from a earlier Api call, ah well the joys of coding.
Posted on 2001-10-27 12:45:40 by Eóin