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Ok ! u mean to say that the first value of COLOR_(which i think is COLOR_SCROLLBAR) will get treated as a NULL pointer!Got it !Thnks @grumpy @novacain :D

Ok ! I got that HBRUSH is a pointer type but what about "Adding the 1 is necessary to ensure all valid COLOR_xxx values correspond to a non-NULL HBRUSH."? Is it in the MS documentation or just a...

Books(the Charles Petzold one) say that there is a need of adding +1 while using the System colours like..

wndclass.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1)

I don't understand the need of...