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VideoPortStartTimer function

The VideoPortStartTimer function enables calls to a miniport driver's HwVidTimer function.

Syntax


VOID VideoPortStartTimer(
  PVOID HwDeviceExtension
);

Parameters

HwDeviceExtension

Pointer to the miniport driver's device extension. This pointer is the input parameter to the HwVidTimer function.

Return value

None

Remarks

After a miniport driver calls VideoPortStartTimer, its HwVidTimer function is called at approximately one-second intervals until the miniport driver calls VideoPortStopTimer. A miniport driver's HwVidTimer function must not call VideoPortStopTimer.

A miniport driver cannot call VideoPortStartTimer or VideoPortStopTimer if its DriverEntry function set the HwTimer member of the VIDEO_HW_INITIALIZATION_DATA structure to NULL.

Requirements

Version

Available in Windows 2000 and later versions of the Windows operating systems.

Header

Video.h (include Video.h)

Library

Videoprt.lib

DLL

Videoprt.sys

IRQL

<=DISPATCH_LEVEL

See also

DriverEntry of Video Miniport Driver
HwVidTimer
VIDEO_HW_INITIALIZATION_DATA
VideoPortStopTimer

 

 

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