The IDirectDrawSurface4::GetDDInterface method retrieves an interface to the DirectDraw object that was used to create the surface.
HRESULT GetDDInterface(
  LPVOID FAR *lplpDD  
);
 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_INVALIDOBJECT | 
| DDERR_INVALIDPARAMS | 
This method was not implemented in the IDirectDraw interface.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in ddraw.h.
  Import Library: Use ddraw.lib.