Why typecast with HBRUSH in the WNDCLASS

When I/you declare the fields of the WNDCLASS, the one of them is hbrBackground. Well, the way petzold told me to set the background of the window class is this:

Code:

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wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);

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Why do you need to typecast with the HBRUSH type?

Thanks.

--Garfield

because GetStockObject() returns a HGDIOBJ and we need a HBRUSH hence the cast.

Hi Garfield,

The return from GetStockObject is a handle to a GDI object (HGDIOBJ). Some compilers may be picky and give you a compiler error if it's not cast to the exact type of the structure member.

Thanks for the explanation!

--Garfield

Compilers whould warn this it but they shouldn't give an error. I mean, both HBRUSH and HGDIOBJ are DWORDs (There are only three regular datatypes in the world!).