The IDirectDrawSurface4::GetCaps method retrieves the capabilities of the surface. These capabilities are not necessarily related to the capabilities of the display device.
HRESULT GetCaps(
  LPDDSCAPS2 lpDDSCaps  
);
 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 differs from its counterpart in the IDirectDrawSurface3 interface in that it accepts a pointer to a DDSCAPS2 structure rather than the legacy DDSCAPS structure.
  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.