HRESULT WINAPI lpfnCallback(LPDIRECTDRAWSURFACE lpDDSurface,
LPVOID lpContext);
Application-defined callback procedure for the IDirectDrawSurface::EnumOverlayZOrders method.
·Returns DDENUMRET_OK to continue the enumeration, or DDENUMRET_CANCEL to stop it.
lpDDSurface
Address of the surface being overlaid on this surface.
lpContext
Address of the user-defined context specified by the user.