将性能数据写入日志文件

我正在尝试使用其中一个Windows示例来获得一些CPU数据。当我尝试调试以下代码时，我收到消息"命令行必须包含有效的日志文件名"我正在使用MS Visual Studio 2013，并且我对总处理器时间感兴趣。

请指教。

有关代码的更多详细信息：http://msdn.microsoft.com/en-us/library/windows/desktop/aa373228（v=vs.85）.aspx

守则：

#include <windows.h>
#include <stdio.h>
#include <pdh.h>
#include <pdhmsg.h>
#pragma comment(lib, "pdh.lib")
CONST PWSTR COUNTER_PATH = L"\Processor(0)\% Processor Time";
CONST ULONG SAMPLE_INTERVAL_MS = 1000;
void DisplayCommandLineHelp(void)
{
    wprintf(L"The command line must include a valid log file name.n");
}
void wmain(int argc, WCHAR **argv)
{
    HQUERY hQuery = NULL;
    HLOG hLog = NULL;
    PDH_STATUS pdhStatus;
    DWORD dwLogType = PDH_LOG_TYPE_CSV;
    HCOUNTER hCounter;
    DWORD dwCount;
    if (argc != 2)
    {
        DisplayCommandLineHelp();
        goto cleanup;
    }
    // Open a query object.
    pdhStatus = PdhOpenQuery(NULL, 0, &hQuery);
    if (pdhStatus != ERROR_SUCCESS)
    {
        wprintf(L"PdhOpenQuery failed with 0x%xn", pdhStatus);
        goto cleanup;
    }
    // Add one counter that will provide the data.
    pdhStatus = PdhAddCounter(hQuery,
        COUNTER_PATH,
        0,
        &hCounter);
    if (pdhStatus != ERROR_SUCCESS)
    {
        wprintf(L"PdhAddCounter failed with 0x%xn", pdhStatus);
        goto cleanup;
    }
    // Open the log file for write access.
    pdhStatus = PdhOpenLog(argv[1],
        PDH_LOG_WRITE_ACCESS | PDH_LOG_CREATE_ALWAYS,
        &dwLogType,
        hQuery,
        0,
        NULL,
        &hLog);
    if (pdhStatus != ERROR_SUCCESS)
    {
        wprintf(L"PdhOpenLog failed with 0x%xn", pdhStatus);
        goto cleanup;
    }
    // Write 10 records to the log file.
    for (dwCount = 0; dwCount < 10; dwCount++)
    {
        wprintf(L"Writing record %dn", dwCount);
        pdhStatus = PdhUpdateLog(hLog, NULL);
        if (ERROR_SUCCESS != pdhStatus)
        {
            wprintf(L"PdhUpdateLog failed with 0x%xn", pdhStatus);
            goto cleanup;
        }
        // Wait one second between samples for a counter update.
        Sleep(SAMPLE_INTERVAL_MS);
    }
cleanup:
    // Close the log file.
    if (hLog)
        PdhCloseLog(hLog, 0);
    // Close the query object.
    if (hQuery)
        PdhCloseQuery(hQuery);
}