CombineRgn,看hrgnDest是否EqualRgn B int CombineRgn( HRGN hrgnDest, // handle to destination region HRGN hrgnSrc1, // handle to source region HRGN hrgnSrc2, // handle to source region int fnCombineMode // region combining mode );
参考: Guide to WIN32 Regions http://www.codeproject.com/gdi/rgnguide.asp
int CombineRgn(
HRGN hrgnDest, // handle to destination region
HRGN hrgnSrc1, // handle to source region
HRGN hrgnSrc2, // handle to source region
int fnCombineMode // region combining mode
);
Guide to WIN32 Regions
http://www.codeproject.com/gdi/rgnguide.asp