Question

我想检索当前进程（或特定进程）的cpu和ram使用情况。检索窗口的标题不是问题，而且该部分有效。但即使活动窗口以70％或更高的CPU运行，cpu显示仍保持在0％。

（INT）pCPU.NextValue（）; //＆lt;＆lt;＆lt;＆lt;不断返回0 ...

注意：我想用性能计数器来做。我不想使用Process变量来执行它，因为那可能会引发“权限错误不足”。

    [DllImport("user32.dll")]
    static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll")]
    static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int count);

    [DllImport("user32.dll")]
    public static extern IntPtr GetWindowThreadProcessId(IntPtr hWnd, out uint ProcessId);

    public void GetActiveCPUAndRam(out string windowTitle, out int CPUUsagePerc, out int RAMUsage)
    {
        IntPtr hwnd = GetForegroundWindow();
        uint pid;
        GetWindowThreadProcessId(hwnd, out pid);

        Process activeProc = Process.GetProcessById((int) pid);

        #region Window Title

        const int nChars = 256;
        StringBuilder Buff = new StringBuilder(nChars);
        if (GetWindowText(hwnd, Buff, nChars) > 0)
            windowTitle = Buff.ToString();
        else
        {
            windowTitle = "";
            CPUUsagePerc = 0;
            RAMUsage = 0;
            return;
        }

        #endregion

        #region RAM/CPU
        PerformanceCounter pCPU = new PerformanceCounter("Process", "% Processor Time", activeProc.ProcessName, true);
        pCPU.NextValue();
        CPUUsagePerc = (int)pCPU.NextValue(); // <<<<< problem here.

        RAMUsage = 0; // TODO:

        #endregion
    }

编辑：我尝试了新的解决方案：但是，当我运行一个cpu压力测试程序，将CPU使用率推到100％（单核）。然后下面的解决方案显示该进程的cpu使用率就像cpu总量的300-400％......显然还有一些问题。

        private PerformanceCounter pCPU = null;
        private IntPtr PreviousProcHwnd = IntPtr.Zero;
        private CounterSample PreviousCPUCounterSample = CounterSample.Empty;

        public void GetActiveCPUAndRam(out string windowTitle, out int CPUUsagePerc, out int RAMUsage)
{
        ...
        #region RAM/CPU

        if (PreviousProcHwnd != hwnd)
        {
            PreviousProcHwnd = hwnd;
            pCPU = new PerformanceCounter("Process", "% Processor Time", activeProc.ProcessName,
                                                             true);
            PreviousCPUCounterSample = CounterSample.Empty;
        }

        CounterSample sample1 = pCPU.NextSample();
        CPUUsagePerc = (int)CounterSample.Calculate(PreviousCPUCounterSample, sample1);
        PreviousCPUCounterSample = sample1;
        RAMUsage = 0; // TODO:

        #endregion
}

Answer 1

请勿直接使用该值，请使用计算出的样本

CounterSample sample1 = pCPU.NextSample();
float value = CounterSample.Calculate(sample1);

如果您的计数器是'费率'类型样本，那么您需要获得两个样本，

CounterSample sample1 = counter.NextSample();
Thread.Sleep(1000); // wait some time
CounterSample sample2 = counter.NextSample();
float value = CounterSample.Calculate(sample1, sample2);

C＃从特定进程获取CPU和RAM（性能计数器）

1 个答案: