|Microsoft DirectX 9.0|
The GetVerticalBlankStatus method returns the status of the vertical blank. It will set the passed BOOL to TRUE if it is in the vertical blank and FALSE otherwise. To synchronize with the vertical blank, consider using WaitForVerticalBlank.
HRESULT GetVerticalBlankStatus( LPBOOL lpbIsInVB );
Points to the BOOL that will be filled in with the status of the vertical blank.
|DD_OK||The method succeeded.|
|DDERR_INVALIDOBJECT||DirectDraw received a pointer that was an invalid DirectDraw object.|
|DDERR_INVALIDPARAMS||One or more of the input parameters is invalid.|