VideoPortReadRegisterUlong function (video.h)

Article
04/01/2021

The VideoPortReadRegisterUlong function reads a ULONG value from a mapped register range.

Syntax

VIDEOPORT_API ULONG VideoPortReadRegisterUlong(
  PULONG Register
);

Parameters

Register

Pointer to the register. The given Register must be in a mapped memory-space range returned by VideoPortGetDeviceBase.

Return value

VideoPortReadRegisterUlong returns the ULONG value read from the adapter.

Remarks

A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortReadRegisterUlong.

Callers of VideoPortReadRegisterUlong can be running at any IRQL, provided that the memory pointed to by the Register parameter is resident, mapped device memory.

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	See Remarks section.