VideoPortCompareMemory function (video.h)

Article
04/01/2021

The VideoPortCompareMemory function compares two blocks of system memory, byte-by-byte, and returns the number of compared bytes that are equivalent.

Syntax

VIDEOPORT_API ULONG VideoPortCompareMemory(
  PVOID  Source1,
  PVOID  Source2,
  SIZE_T Length
);

Parameters

Source1

Pointer to the first block of memory to compare.

Source2

Pointer to the second block of memory to compare.

Length

Specifies the number of bytes to be compared.

Return value

VideoPortCompareMemory returns the number of bytes that are equivalent. If both blocks are equivalent, it returns the Length parameter.

Remarks

The values in the Source1 and Source2 parameters must be in a mapped logical range returned by VideoPortGetDeviceBase and/or a system space RAM address, such as an address on the stack.

Callers of VideoPortCompareMemory can be running at any IRQL if both blocks of memory are resident.

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	Any level (see Remarks section)