Conversione dei dati da un file di log in formato binario a un file di log in formato CSV

L'esempio seguente trasferisce i dati da un file di log contatore creato dallo strumento Prestazioni a un formato delimitato da virgole (.csv). L'esempio trasferisce i dati del contatore time del processore raccolti dal computer locale. Per specificare un altro tipo di dati del contatore, modificare la variabile szCounterPath. Se i dati del contatore raccolti provengono da un computer specifico, aggiungere il nome del computer al percorso , ad esempio "\<>nome computer\\Processor(0)\\% Processore Time").

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <pdh.h>
#include <pdhmsg.h>

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

CONST PWSTR COUNTER_PATH = L"\\Processor(0)\\% Processor Time";

void DisplayCommandLineHelp(void)
{
    wprintf(L"Syntax: convertlog <input file name> <output file name>\n"
        L"\nThe input log file must be in the Perfmon format. The output\n"
        L"log file will written in the CSV file format, so specify a .csv extension.");
}

void wmain(int argc, WCHAR **argv)
{
    HQUERY hQuery = NULL;
    HLOG hOutputLog = NULL;
    HCOUNTER hCounter = NULL;
    PDH_STATUS pdhStatus = ERROR_SUCCESS;
    DWORD dwOutputLogType = PDH_LOG_TYPE_CSV;

    if (3 != argc)
    {
        DisplayCommandLineHelp();
        goto cleanup;
    }

    // Create the query object using the input log file.
    pdhStatus = PdhOpenQuery(argv[1], 0, &hQuery);

    if (ERROR_SUCCESS != pdhStatus)
    {
        wprintf(L"PdhOpenQuery failed with 0x%x\n", pdhStatus);
        goto cleanup;
    }
   
    // Add the counter to the query object; identifies the counter
    // records from the log file that you are going to relog to 
    // the new log file.
    pdhStatus = PdhAddCounter(hQuery,
        COUNTER_PATH,
        0,
        &hCounter);

    if (ERROR_SUCCESS != pdhStatus)
    {
        wprintf(L"PdhAddCounter failed with 0x%x\n", pdhStatus);
        goto cleanup;
    }

    // Create and open the output log file.
    pdhStatus = PdhOpenLog(argv[2], 
        PDH_LOG_WRITE_ACCESS | 
        PDH_LOG_CREATE_ALWAYS,
        &dwOutputLogType,
        hQuery,
        0, 
        NULL,
        &hOutputLog);

    if (ERROR_SUCCESS != pdhStatus)
    {
        wprintf(L"PdhOpenLog failed with 0x%x\n", pdhStatus);
        goto cleanup;
    }

    // Transfer the log records from the input file to the output file.
    while (ERROR_SUCCESS == pdhStatus) 
    { 
        pdhStatus = PdhUpdateLog(hOutputLog, NULL);
    }

    if (PDH_NO_MORE_DATA != pdhStatus)
    {
        wprintf(L"PdhUpdateLog failed with 0x%x\n", pdhStatus);
    }

cleanup:

   // Close the output log file.
   if (hOutputLog)
      PdhCloseLog(hOutputLog, 0);

   // Close the query object and input log file.
   if (hQuery)
      PdhCloseQuery(hQuery);
}