GET_CLASS_LONG_INDEX
enum GET_CLASS_LONG_INDEX
GCL_CBCLSEXTRA = -20
GCL_CBWNDEXTRA = -18
GCL_HBRBACKGROUND = -10
GCL_HCURSOR = -12
GCL_HICON = -14
GCL_HICONSM = -34
GCL_HMODULE = -16
GCL_MENUNAME = -8
GCL_STYLE = -26
GCL_WNDPROC = -24
GCLP_HBRBACKGROUND = -10
GCLP_HCURSOR = -12
GCLP_HICON = -14
GCLP_HICONSM = -34
GCLP_HMODULE = -16
GCLP_MENUNAME = -8
GCLP_WNDPROC = -24
GCW_ATOM = -32