Telegraf ISSUE 1827

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PHDTest.cpp

#include "stdafx.h"


// Example copied from https://msdn.microsoft.com/en-us/library/windows/desktop/aa372633(v=vs.85).aspx

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

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

CONST PWSTR COUNTER_PATH = L"\\Process(*)\\% Processor Time";
CONST ULONG SAMPLE_INTERVAL_MS = 1000;

void main()
{
	PDH_HQUERY hQuery = NULL;
	PDH_STATUS status = ERROR_SUCCESS;
	PDH_HCOUNTER hCounter = NULL;
	DWORD dwBufferSize = 0;         // Size of the pItems buffer
	DWORD dwItemCount = 0;          // Number of items in the pItems buffer
	PDH_FMT_COUNTERVALUE_ITEM *pItems = NULL;  // Array of PDH_FMT_COUNTERVALUE_ITEM structures

	if (status = PdhOpenQuery(NULL, 0, &hQuery))
	{
		wprintf(L"PdhOpenQuery failed with 0x%x.\n", status);
		goto cleanup;
	}

	// Specify a counter object with a wildcard for the instance.
	if (status = PdhAddCounter(hQuery, COUNTER_PATH, 0, &hCounter))
	{
		wprintf(L"PdhAddCounter failed with 0x%x.\n", status);
		goto cleanup;
	}

	// Some counters need two sample in order to format a value, so
	// make this call to get the first value before entering the loop.
	if (status = PdhCollectQueryData(hQuery))
	{
		wprintf(L"PdhCollectQueryData failed with 0x%x.\n", status);
		goto cleanup;
	}

	for (int i = 0; i < 10; i++)
	{
		Sleep(SAMPLE_INTERVAL_MS);

		if (status = PdhCollectQueryData(hQuery))
		{
			wprintf(L"PdhCollectQueryData failed with 0x%x.\n", status);
			goto cleanup;
		}

		// Get the required size of the pItems buffer.
		status = PdhGetFormattedCounterArray(hCounter, PDH_FMT_DOUBLE, &dwBufferSize, &dwItemCount, pItems);
		if (PDH_MORE_DATA == status)
		{
			pItems = (PDH_FMT_COUNTERVALUE_ITEM *)malloc(dwBufferSize);
			if (pItems)
			{
				status = PdhGetFormattedCounterArray(hCounter, PDH_FMT_DOUBLE, &dwBufferSize, &dwItemCount, pItems);
				if (ERROR_SUCCESS == status)
				{
					// Loop through the array and print the instance name and counter value.
					for (DWORD i = 0; i < dwItemCount; i++)
					{
						wprintf(L"counter: %s, value %.20g\n", pItems[i].szName, pItems[i].FmtValue.doubleValue);
					}
				}
				else
				{
					wprintf(L"Second PdhGetFormattedCounterArray call failed with 0x%x.\n", status);
					goto cleanup;
				}

				free(pItems);
				pItems = NULL;
				dwBufferSize = dwItemCount = 0;
			}
			else
			{
				wprintf(L"malloc for PdhGetFormattedCounterArray failed.\n");
				goto cleanup;
			}
		}
		else
		{
			wprintf(L"PdhGetFormattedCounterArray failed with 0x%x.\n", status);
			goto cleanup;
		}
	}

cleanup:

	if (pItems)
		free(pItems);

	if (hQuery)
		PdhCloseQuery(hQuery); // Closes all counter handles and the query handle
}