Platform SDK: DirectX |
The IDirectDraw7::GetScanLine method retrieves the scan line that is currently being drawn on the monitor.
HRESULT GetScanLine( LPDWORD lpdwScanLine );
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_UNSUPPORTED |
DDERR_VERTICALBLANKINPROGRESS |
Scan lines are reported as zero-based integers. The returned scan line value is in the range from 0 through n, where 0 is the first visible scan line on the screen and n is the last visible scan line, plus any scan lines that occur during the vertical blank period. So, in a case where an application is running at a resolution of 640×480 and there are 12 scan lines during vblank, the values returned by this method range from 0 through 491.
Windows NT/2000: Requires Windows 2000.
Windows 95/98: Requires Windows 98.
Header: Declared in ddraw.h.
IDirectDraw7::GetVerticalBlankStatus, IDirectDraw7::WaitForVerticalBlank