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- Description
The TDx_DrawVideoPort::WaitForSync method can help an application synchronise by waiting for the VSYNC or a specified scan line.
If the method call fails, the OnError event will be triggered with one of the following values:
DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS
DDERR_UNSUPPORTED
DDERR_VIDEONOTACTIVE
DDERR_WASSTILLDRAWING
- Parameters
Flags
The Flags parameter defines flags indicating just how to wait.
The described effect applies when the flag is set.
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DDVPWAIT_BEGINVBLANK
Stop waiting at the start of the VBI.
DDVPWAIT_ENDVBLANK
Stop waiting at the end of the VBI.
DDVPWAIT_LINE
Stop waiting when the line number specified in the Line parameter of this method is passed.
The Line parameter defines the video line number, relative to field height and before prescaling, that the waiting should stop.
This parameter is only used when DDVPWAIT_LINE is set.
Timeout
The Timeout parameter defines the maximum time, in milliseconds, to wait before timing out and returning.
Setting this property to 0 results in a wait of 3 times the setting of TDDVideoPortDesc::MicrosecondsPerField.
- See Also
- Top
TDx_Draw_Library v2.00 Component Reference
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[ TDx_DrawVideoPort::WaitForSync() ] [ prev: UpdateVideo() ] public:
virtual bool __fastcall WaitForSync( dword pFlags, dword pLine, dword pTimeout );
TDX_DRAWVIDEOPORT::WAITFORSYNC()
[ component method ]
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