How do I send a WM_PAINT message to my window or trigger a WM_PAINT?

[ddeham]

How do I send a WM_PAINT message to my window or trigger a WM_PAINT message? I tried
SendMessage (hWnd, WM_PAINT, 0, 0);
but that didn't work. I'm using Microsoft eMbedded Visual C++ 4.0 with a non-MFC Pocket PC application.

 

[chrisdl]

Try using the Invalidate() function.


-Chris (Consultant / Software Engineer)

 

[HyperEngineer]

Make sure that the hWnd is a valid handle to the window you want to paint. If the SendMessage() function returns then check that it returned 0. Otherwise, check GetLastError() to see what the failure was. If you want to return immediately, use PostMessage() instead of SendMessage().


HyperEngineer
If it ain't broke, it probably needs improvement.

 

[ddeham]

I figured it out. I used
InvalidateRect(hWnd, NULL, TRUE);
By the way
InvalidateRgn(hWnd, NULL, TRUE);
also worked.

Thanks,

Dan