PDH性能测试之四-----------获取每个对象的Counter和Instance

最新推荐文章于 2022-05-26 02:00:00 发布

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#C++ #PDH #性能

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本文介绍了使用 PDH 函数获取实时源上的性能对象列表及其属性列表的方法，并详细阐述了如何遍历这些列表以获取所需数据。

#define _UNICODE /*主要对C标准库函数，将宏替换为宽字节形式*/
#define UNICODE /*主要对Windows API标准函数，将函数宏替换为宽字节形式*/
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#include <malloc.h>
#include <stdio.h>
#include <pdh.h>
#include <pdhmsg.h> /*存放PDH函数返回的错误代码*/
#include <tchar.h> ///

#pragma comment(lib, "pdh.lib")
void getObjects(BOOL bCounter,BOOL bInstance);
void getObjcetItem(LPTSTR ptsObject,BOOL bCounter,BOOL bInstance);
void main(void) {
	getObjects(TRUE,FALSE);
	getObjects(FALSE,TRUE);
}
void getObjects(BOOL bCounter,BOOL bInstance) {

	PDH_STATUS status = ERROR_SUCCESS;
	LPTSTR ptsObjectsListBuffer = NULL;
	DWORD dwObjectsListSize = 0;
	LPTSTR pTemp = NULL;
	/*第一次调用，将返回实际的字符数*/
	status = PdhEnumObjects(
			NULL,				// real-time source
			NULL,				// local machine
			ptsObjectsListBuffer,         // LPTSTR mszObjectList
			&dwObjectsListSize,   //LPDWORD pcchBufferLength,
			PERF_DETAIL_EXPERT,     //DWORD dwDetailLevel
			FALSE     //BOOL bRefresh
			);
	/*读取性能对象列表*/
	if (status == PDH_MORE_DATA) {
		// Allocate the buffers and try the call again.
		ptsObjectsListBuffer = (LPTSTR) malloc(dwObjectsListSize * sizeof(TCHAR));
		if (NULL != ptsObjectsListBuffer) {
			status = PdhEnumObjects(
					NULL,     // real-time source
					NULL,     // local machine
					ptsObjectsListBuffer,         // LPTSTR mszObjectList
					&dwObjectsListSize,   //LPDWORD pcchBufferLength,
					PERF_DETAIL_EXPERT,     //DWORD dwDetailLevel
					FALSE     //BOOL bRefresh
					);
			if (status == ERROR_SUCCESS) {
				for (pTemp = ptsObjectsListBuffer; *pTemp != 0;pTemp += _tcslen(pTemp) + 1)
						/*从字符数组中读取字符串的方法*/
						{
					_tprintf(_T("%s\n"), pTemp);

					getObjcetItem(pTemp,bCounter,bInstance);
					//wprintf(L"%s\n", pTemp);
				}
			} else {
				_tprintf(_T("Second PdhEnumObjects failed with %0x%x.\n"),
						status);
			}
		} else {
			_tprintf(_T("Unable to allocate buffers.\n"));
			status = ERROR_OUTOFMEMORY;
		}
	} else {
		_tprintf(_T("\nPdhEnumObjects failed with 0x%x.\n"), status);
	}
	if (ptsObjectsListBuffer != NULL)
		free(ptsObjectsListBuffer);
}
void getObjcetItem(LPTSTR ptsObject,BOOL bCounter,BOOL bInstance) {
	PCTSTR strObject =ptsObject;
	PDH_STATUS status = ERROR_SUCCESS;
	LPTSTR ptsCounterListBuffer = NULL;     //类的属性列表
	DWORD dwCounterListSize = 0;
	LPTSTR ptsInstanceListBuffer = NULL;     //实例列表
	DWORD dwInstanceListSize = 0;
	LPTSTR pTemp = NULL;

	// Determine the required buffer size for the data.
	status = PdhEnumObjectItems(
			NULL,                   // real-time source
			NULL,                   // local machine
			strObject,         // object to enumerate
			ptsCounterListBuffer, &dwCounterListSize,//如果Buffer为NULL,Size为0
			ptsInstanceListBuffer, &dwInstanceListSize,
			PERF_DETAIL_WIZARD,     // counter detail level
			0);

	if (status == PDH_MORE_DATA) {
		// Allocate the buffers and try the call again.
		ptsCounterListBuffer = (LPTSTR) malloc(dwCounterListSize * sizeof(TCHAR));
		ptsInstanceListBuffer = (LPTSTR) malloc(dwInstanceListSize * sizeof(TCHAR));

		if (NULL != ptsCounterListBuffer && NULL != ptsInstanceListBuffer) {
			status = PdhEnumObjectItems(
					NULL,                   // real-time source
					NULL,                   // local machine
					strObject,         // object to enumerate
					ptsCounterListBuffer, &dwCounterListSize,
					ptsInstanceListBuffer, &dwInstanceListSize,
					PERF_DETAIL_WIZARD,     // counter detail level
					0);

			if (status == ERROR_SUCCESS) {
				_tprintf(_T("_____________________\n"));
				_tprintf(_T("Counters ConTain:\n\n"));
				//wprintf(L"Counters that the Process objects defines:\n\n");

				// Walk the counters list. The list can contain one
				// or more null-terminated strings. The list is terminated
				// using two null-terminator characters.
				if(bCounter){
				for (pTemp = ptsCounterListBuffer; *pTemp != 0;pTemp += _tcslen(pTemp) + 1) {
					_tprintf(_T("\t"));
					_tprintf(_T("%s\n"), pTemp);
					//wprintf(L"%s\n", pTemp);
				}
				}
				if(bInstance){
					_tprintf(_T("_____________________\n"));
					_tprintf(_T("\nInstances Contain:\n\n"));
				//wprintf(L"\nInstances of the Process object:\n\n");

				// Walk the instance list. The list can contain one
				// or more null-terminated strings. The list is terminated
				// using two null-terminator characters.
				for (pTemp = ptsInstanceListBuffer; *pTemp != 0;pTemp +=_tcslen(pTemp) + 1) {
					_tprintf(_T("\t"));
					_tprintf(_T("%s\n"), pTemp);
					//wprintf(L"%s\n", pTemp);
				}
				}
			} else {
				_tprintf(_T("Second PdhEnumObjectItems failed with %0x%x.\n"),
						status);
				//wprintf(L"Second PdhEnumObjectItems failed with %0x%x.\n",status);
			}
		} else {
			_tprintf(_T("Unable to allocate buffers.\n"));
			//wprintf(L"Unable to allocate buffers.\n");
			status = ERROR_OUTOFMEMORY;
		}
	} else {
		_tprintf(_T("\nPdhEnumObjectItems failed with 0x%x.\n"), status);
		//wprintf(L"\nPdhEnumObjectItems failed with 0x%x.\n", status);
	}

	if (ptsCounterListBuffer != NULL)
		free(ptsCounterListBuffer);

	if (ptsInstanceListBuffer != NULL)
		free(ptsInstanceListBuffer);
}