CDC::GetBkColor
Returns the current background color.
COLORREF GetBkColor( ) const;
An RGB color value.
If the background mode is OPAQUE, the system uses the background color to fill the gaps in styled lines, the gaps between hatched lines in brushes, and the background in character cells. The system also uses the background color when converting bitmaps between color and monochrome device contexts.
Header: afxwin.h