GetPerformanceInfo function (psapi.h)

Article
10/13/2021

Retrieves the performance values contained in the PERFORMANCE_INFORMATION structure.

Syntax

BOOL GetPerformanceInfo(
  [out] PPERFORMANCE_INFORMATION pPerformanceInformation,
  [in]  DWORD                    cb
);

Parameters

[out] pPerformanceInformation

A pointer to a PERFORMANCE_INFORMATION structure that receives the performance information.

[in] cb

The size of the PERFORMANCE_INFORMATION structure, in bytes.

Return value

If the function succeeds, the return value is TRUE. If the function fails, the return value is FALSE. To get extended error information, call GetLastError.

Remarks

Starting with Windows 7 and Windows Server 2008 R2, Psapi.h establishes version numbers for the PSAPI functions. The PSAPI version number affects the name used to call the function and the library that a program must load.

If PSAPI_VERSION is 2 or greater, this function is defined as K32GetPerformanceInfo in Psapi.h and exported in Kernel32.lib and Kernel32.dll. If PSAPI_VERSION is 1, this function is defined as GetPerformanceInfo in Psapi.h and exported in Psapi.lib and Psapi.dll as a wrapper that calls K32GetPerformanceInfo.

Programs that must run on earlier versions of Windows as well as Windows 7 and later versions should always call this function as GetPerformanceInfo. To ensure correct resolution of symbols, add Psapi.lib to the TARGETLIBS macro and compile the program with –DPSAPI_VERSION=1. To use run-time dynamic linking, load Psapi.dll.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	psapi.h
Library	Kernel32.lib on Windows 7 and Windows Server 2008 R2; Psapi.lib (if PSAPI_VERSION=1) on Windows 7 and Windows Server 2008 R2; Psapi.lib on Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP
DLL	Kernel32.dll on Windows 7 and Windows Server 2008 R2; Psapi.dll (if PSAPI_VERSION=1) on Windows 7 and Windows Server 2008 R2; Psapi.dll on Windows Server 2008, Windows Vista, Windows Server 2003 and Windows XP