IDirectDraw::GetScanLine
This method retrieves the scan line that is currently being drawn on the monitor.
HRESULT GetScanLine(
LPDWORD lpdwScanLine
);
Parameters
- lpdwScanLine
Address of the variable that will contain the scan line the display is currently drawing.
Return Values
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 |
| DDERR_UNSUPPORTED |
| DDERR_VERTICALBLANKINPROGRESS |
Remarks
Scan lines are reported as zero-based integers.
The returned scan line value is between 0 and n, where scan line 0 is the first visible scan line on the screen and n is the last visible scan line, plus scan lines that occur during the vertical blank period.
So, in a case where an application is running at 640×480, and there are 12 scan lines during the vertical blank period, the values returned by this method will range from 0 to 491.
Requirements
Pocket PC: Windows Mobile 5.0 and later
Smartphone: Windows Mobile 5.0 and later
OS Versions: Windows CE 5.01 and later
Header: Ddraw.h.
Library: Ddraw.lib.
See Also
IDirectDraw::GetVerticalBlankStatus | IDirectDraw::WaitForVerticalBlank
Send Feedback on this topic to the authors