Given a visible, active overlay surface (DDSCAPS_OVERLAY flag set), the IDirectDrawSurface3::GetOverlayPosition method returns the display coordinates of the surface.
HRESULT GetOverlayPosition(
LPLONG lplX,
LPLONG lplY
);
If the method succeeds, the return value is DD_OK.
If the method fails, the return value may be one of the following error values:
| DDERR_GENERIC |
| DDERR_INVALIDOBJECT |
| DDERR_INVALIDPARAMS |
| DDERR_INVALIDPOSITION |
| DDERR_NOOVERLAYDEST |
| DDERR_NOTAOVERLAYSURFACE |
| DDERR_OVERLAYNOTVISIBLE |
| DDERR_SURFACELOST |
IDirectDrawSurface3::SetOverlayPosition, IDirectDrawSurface3::UpdateOverlay