HRESULT WINAPI lpfnCallback(LPDIRECTDRAWSURFACE lpDDSurface,
LPVOID lpContext);
Application-defined callback function for the IDirectDrawSurface2::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 an application-defined structure that will be passed to the callback function each time the function is called.