typedef HBITMAP (CALLBACK *funcQHTMBitmapCallback)( LPCTSTR pcszImageURL, LPARAM );
Type used when setting an image callback.
If you want to override QHTM's image handling and provide your own mechanisms then this is how you'd do it. This gives you the opportunity to provide QHTM with a general purpose HBITMAP.
See also QHTM_OPT_SET_BITMAP_CALLBACK