使用PDH获取windows状态_pdhcollectquerydata 失败-优快云博客

本文链接：https://blog.youkuaiyun.com/wangcg123/article/details/53463655

本文介绍如何使用PDH（Performance Data Helper）来获取Windows系统的性能数据，包括CPU使用率、磁盘读写速度及网络收发速度等关键指标。通过具体代码示例展示了如何正确配置并收集这些性能计数器。

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PDH可以被用来获取windows各种姿态信息，比如：内存、cpu、硬盘、IO等信息；

其中Counter名称格式不好写，有时会写错，一个比较好的办法是调用 PdhEnumObjectItems, 它会弹出一个窗口让你选择，并根据选择返回counter名称格式，很不错，

参考：https://msdn.microsoft.com/en-us/library/windows/desktop/aa372151%28v=vs.85%29.aspx

//参考代码：

//CONST ULONG SAMPLE_INTERVAL_MS    = 1000;
int getWin_SystemInfo_pdh(const char* pCounterPathBuffer, double& dValue)
{
   int dRet = 0;
    PDH_STATUS Status;
    HQUERY Query = NULL;
    HCOUNTER Counter;
    PDH_FMT_COUNTERVALUE DisplayValue;
    DWORD CounterType;
    CHAR CounterPathBuffer[PDH_MAX_COUNTER_PATH];

    //
    // Create a query.
    //

    Status = PdhOpenQuery(NULL, NULL, &Query);
    if (Status != ERROR_SUCCESS)
    {
       printf("\nPdhOpenQuery failed with status 0x%x.", Status);
       dRet = -1;
       goto Cleanup;
    }

    //
    // Add the selected counter to the query.
    //

   //sprintf_s(CounterPathBuffer, "\\Network Interface(*)\\Bytes Received/sec"); //ÍøÂçIO ÊÕ
   //    "\\Network Interface(*)\\Bytes Sent/sec" //ÍøÂçIO ·¢
   // "\\Network Interface(*)\\Bytes Total/sec" //ÍøÂçIO ×Ü
   // "\\PhysicalDisk(*)\\Disk Read Bytes/sec"   //ŽÅÅÌIO ¶Á
   // "\\PhysicalDisk(*)\\Disk Write Bytes/sec"   //ŽÅÅÌIO ¶Á
   // "\\Processor Information(*)\\% Processor Time" //CPUÕŒÓÃÂÊ
   // "\\Memory\\Available MBytes"          //ÄÚŽæ Ê£Óà

   strcpy_s(CounterPathBuffer, PDH_MAX_COUNTER_PATH, pCounterPathBuffer);
    Status = PdhAddCounter(Query, CounterPathBuffer, 0, &Counter);
    if (Status != ERROR_SUCCESS)
    {
        printf("\nPdhAddCounter failed with status 0x%x.", Status);
       dRet = -2;
        goto Cleanup;
    }

    //
    // Most counters require two sample values to display a formatted value.
    // PDH stores the current sample value and the previously collected
    // sample value. This call retrieves the first value that will be used
    // by PdhGetFormattedCounterValue in the first iteration of the loop
    // Note that this value is lost if the counter does not require two
    // values to compute a displayable value.
    //

    Status = PdhCollectQueryData(Query);
    if (Status != ERROR_SUCCESS)
    {
        printf("\nPdhCollectQueryData failed with 0x%x.\n", Status);
       dRet = -3;
        goto Cleanup;
    }

    //
    // Print counter values until a key is pressed.
    //

    {
       Sleep(1000);

        Status = PdhCollectQueryData(Query);
        if (Status != ERROR_SUCCESS)
        {
            printf("\nPdhCollectQueryData failed with status 0x%x.", Status);
           dRet = -4;
        }

        // Compute a displayable value for the counter.
        Status = PdhGetFormattedCounterValue(Counter, PDH_FMT_DOUBLE, &CounterType, &DisplayValue);
        if (Status != ERROR_SUCCESS)
        {
            printf("\nPdhGetFormattedCounterValue failed with status 0x%x.", Status);
           dRet = -5;
            goto Cleanup;
        }

        printf(",\"%.20g\"", DisplayValue.doubleValue);
       dValue = DisplayValue.doubleValue;
       dRet = 0;
    }

Cleanup:
    // Close the query.
    if (Query)
    {
       PdhCloseQuery(Query);
    }

   return dRet;
}

double getWin_CPU_Usage()
{
   int nRet = 0;
   double dValue;
   nRet = getWin_SystemInfo_pdh("\\Processor Information(*)\\% Processor Time", dValue);
   if(nRet == 0)
       return dValue;
   else
       return -1.00;
}
double getWin_DiskRead_Speed()
{
   int nRet = 0;
   double dValue;
   nRet = getWin_SystemInfo_pdh("\\PhysicalDisk(*)\\Disk Read Bytes/sec", dValue);
   if(nRet == 0)
       return dValue;
   else
       return -1.00;
}
double getWin_DiskWrite_Speed()
{
   int nRet = 0;
   double dValue;
   nRet = getWin_SystemInfo_pdh("\\PhysicalDisk(*)\\Disk Write Bytes/sec", dValue);
   if(nRet == 0)
       return dValue;
   else
       return -1.00;
}
double getWin_NetRead_Speed()
{
   int nRet = 0;
   double dValue;
   nRet = getWin_SystemInfo_pdh("\\Network Interface(*)\\Bytes Received/sec", dValue);
   if(nRet == 0)
       return dValue;
   else
       return -1.00;
}
double getWin_NetWrite_Speed()
{
   int nRet = 0;
   double dValue;
   nRet = getWin_SystemInfo_pdh("\\Network Interface(*)\\Bytes Sent/sec", dValue);
   if(nRet == 0)
       return dValue;
   else
       return -1.00;
}