| DirectX SDK | 
The IDirectDraw7::GetDisplayMode method retrieves the current display mode.
HRESULT GetDisplayMode( LPDDSURFACEDESC2 lpDDSurfaceDesc2 );
If the method succeeds, the return value is DD_OK.
If it fails, the method can return one of the following error values:
| DDERR_INVALIDOBJECT | 
| DDERR_INVALIDPARAMS | 
| DDERR_UNSUPPORTEDMODE | 
An application should not save the information returned by this method to restore the display mode on clean-up. The application should use the IDirectDraw7::RestoreDisplayMode method to restore the mode on clean-up, thus avoiding mode-setting conflicts that could arise in a multiprocess environment.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 98.
  Header: Declared in ddraw.h.
IDirectDraw7::SetDisplayMode, IDirectDraw7::RestoreDisplayMode, IDirectDraw7::EnumDisplayModes