Changing window background colour

Question

In the winAPI, how do I change the window background colour?

For example,

wc.hbrBackground = ....;

is for setting the window background initially, but how do I change it there after?

Thanks.

Answer 1

Use the SetClassLongPtr function with the GCLP_HBRBACKGROUND argument:

SetClassLongPtr(windowHandle, GCLP_HBRBACKGROUND, brushHandle);

http://msdn.microsoft.com/en-us/library/ms633589%28VS.85%29.aspx