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The WaitForVideoPortSynccallback function returns at the beginning or end of either the video V-sync or the specified line.
DWORD __stdcall WaitForVideoPortSync( LPDDHAL_WAITFORVPORTSYNCDATA pwfvpsd );
Returns one of the following values:
If the sync does not occur before the number of milliseconds specified in the dwTimeOut member of the DDHAL_WAITFORVPORTSYNCDATAstructure has elapsed, the HAL should set the ddRVal member of the DDHAL_WAITFORVPORTSYNCDATAstructure to DDERR_VIDEONOTACTIVE.
Last updated on Tuesday, July 13, 2004