Microsoft DirectX 9.0


The GetScanLine method returns the scan line that the monitor is currently updating to the display.


HRESULT GetScanLine(
  LPDWORD lpdwScanLine



Points to the DWORD that will contain the scan line the display is currently on.

Return Values

Value Description
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.
DDERR_UNSUPPORTED Action not supported.
DDERR_VERTICALBLANKINPROGRESS Vertical blank is in progress.

See Also