Focus problem

[Jim Komenda]

I am having a problem with window focus. When a screen saver pops up or another window on the PC(multiple windows opned at once)has the main focus the return to the main C++ application has some of the screen missing which causes the program to crash because the info on the screen is being constantly updated. My main question is how do I know when the focus of the screen has changed? I can do a re-size of the screen by changing it with the mouse and get the missing info back but I don't know when to issue the re-size from with in the application.

[Bore]

Sounds like a job for CWnd::OnKillFocus().