VideoPortEnumerateChildren function (video.h)

Article
10/21/2021

The VideoPortEnumerateChildren function allows a video miniport driver to force a reenumeration of its child devices.

Syntax

VIDEOPORT_DEPRECATED VIDEOPORT_API VP_STATUS VideoPortEnumerateChildren(
  [in] IN PVOID HwDeviceExtension,
  [in] IN PVOID Reserved
);

Parameters

[in] HwDeviceExtension

Pointer to the miniport driver's device extension.

[in] Reserved

Must be set to NULL.

Return value

VideoPortEnumerateChildren returns NO_ERROR.

Remarks

Some devices generate an interrupt when new hardware is connected to the system, or when existing hardware is disconnected from the system. For these devices, VideoPortEnumerateChildren can make such system changes as seamless as possible. The following is one possible scenario that forces the reenumeration of child devices through VideoPortEnumerateChildren:

New hardware is connected, which generates an interrupt.
The miniport driver's interrupt handler (HwVidInterrupt) queues a DPC routine (HwVidDpcRoutine) by calling VideoPortQueueDpc.
The asynchronously executed DPC contains a call to VideoPortEnumerateChildren.

VideoPortEnumerateChildren causes HwVidGetVideoChildDescriptor to be called, allowing the Plug and Play Manager to enumerate all of the adapter's child devices.

Requirements

Requirement	Value
Minimum supported client	Available in Windows 2000 and later versions of the Windows operating systems.
Target Platform	Desktop
Header	video.h (include Video.h)
Library	Videoprt.lib
DLL	Videoprt.sys
IRQL	<= DISPATCH_LEVEL