C++之获取window系统cpu资源占用

公司前一段有个需求就是获取使用电脑cpu、内存等资源占用
就cpu占用而言，获取方式有计算和直接从pdh性能监视器两种。

这里使用pdh获得

最后导出dlll供unity使用

pch.h

#ifndef PCH_H
#define PCH_H

// 添加要在此处预编译的标头
#include "framework.h"

#endif //PCH_H


#include "pdh.h"
#pragma comment(lib,"pdh.lib") 

extern "C" __declspec(dllexport) void InitStart(bool& res);
extern "C" __declspec(dllexport) double GetCurrentCpuValue();
extern "C" __declspec(dllexport) void CloseCPUQuery();

pch.cpp

static PDH_HQUERY cpuQuery;
static PDH_HCOUNTER cpuTotal;


void InitStart(bool& res) {
    
    PDH_STATUS status = PdhOpenQuery(NULL, NULL, &cpuQuery);
    if (status == ERROR_SUCCESS)
    {
        status = PdhAddCounter(cpuQuery, L"\\Processor(_Total)\\% Processor Time", NULL, &cpuTotal);

        if (status == ERROR_SUCCESS)
        {
            status = PdhCollectQueryData(cpuQuery);

            if (status == ERROR_SUCCESS)
            {
                res = true;
            }
        }
    }
}

double GetCurrentCpuValue() {

    double resVlaue = 0;
    PDH_FMT_COUNTERVALUE counterVal;

    PDH_STATUS status = PdhCollectQueryData(cpuQuery);
    if (status == ERROR_SUCCESS)
    {
        status = PdhGetFormattedCounterValue(cpuTotal, PDH_FMT_DOUBLE, NULL, &counterVal);
        if (status == ERROR_SUCCESS)
        {
            resVlaue = counterVal.doubleValue;
        }

    }

    return resVlaue;

}
void CloseCPUQuery()
{
    PdhRemoveCounter(cpuTotal);

    PdhCloseQuery(cpuQuery);
}