Question

这是我正在尝试的代码..

#include "TCHAR.h"
#include "pdh.h"
#include <stdio.h>
#include<iostream>

using namespace std;

static PDH_HQUERY cpuQuery;
static PDH_HCOUNTER cpuTotal;
int _tmain(int argc, _TCHAR* argv[])
{
    PdhOpenQuery(NULL, NULL, &cpuQuery);
    PdhAddCounter(cpuQuery, L"\\Processor(_Total)\\% Processor Time", NULL, &cpuTotal);
    PDH_FMT_COUNTERVALUE counterVal;
    PdhCollectQueryData(cpuQuery);
    PdhCollectQueryData(cpuQuery);
    PdhGetFormattedCounterValue(cpuTotal, PDH_FMT_DOUBLE, NULL, &counterVal);
    cout << counterVal.doubleValue;
    getchar();
}

机器详细信息：Windows 8.1 帮助我，它总是显示0或100。

Answer 1

检索％Processor Time 时，样本集之间必须有延迟

我们需要在PdhCollectQueryData调用之间至少延迟100毫秒。

PdhCollectQueryData(cpuQuery);
this_thread::sleep_for(chrono::milliseconds(1000));
PdhCollectQueryData(cpuQuery);

这将解决问题。参考：https://support.microsoft.com/en-in/kb/262938

使用Pdh Lib的CPU使用率始终显示为0（OR）100％

1 个答案: