CODEWITHSUNDEEP
c++windowsperformancecounterperfmon
RedFox
RedFox

Reputation: 1366

how to read windows perfmon counter?

can I get a C++ code to read windows perfmon counter (category, counter name and instance name)?

It's very easy in c# but I needed c++ code.

Thanks

Upvotes: 1

Views: 4814

Answers (2)

askldjd
askldjd

Reputation: 490

As Doug T. pointed out earlier, I posted a helper class awhile ago to query the performance counter value. The usage of the class is pretty simple, all you have to do is to provide the string for the performance counter. http://askldjd.wordpress.com/2011/01/05/a-pdh-helper-class-cpdhquery/

However, the code I posted on my blog has been modified in practice. From your comment, it seems like you are interested in querying just a single field.

In this case, try adding the following function to my CPdhQuery class.

double CPdhQuery::CollectSingleData()
{
    double data = 0;
    while(true)
    {
        status = PdhCollectQueryData(hQuery);

        if (ERROR_SUCCESS != status)
        {
            throw CException(GetErrorString(status));
        }

        PDH_FMT_COUNTERVALUE cv;
        // Format the performance data record.
        status = PdhGetFormattedCounterValue(hCounter,
            PDH_FMT_DOUBLE,
            (LPDWORD)NULL,
            &cv);

        if (ERROR_SUCCESS != status)
        {
            continue;
        }

        data = cv.doubleValue;

        break;

    }

    return data;
}

For e.g. To get processor time 

counter = boost::make_shared<CPdhQuery>(std::tstring(_T("\\Processor Information(_Total)\% Processor Time")));

To get file read bytes / sec:

counter = boost::make_shared<CPdhQuery>(std::tstring(_T("\\System\\File Read Bytes/sec")));

To get % Committed Bytes:

counter = boost::make_shared<CPdhQuery>(std::tstring(_T("\\Memory\\% Committed Bytes In Use")));

To get the data, do this.

double data = counter->CollectSingleData();

I hope this helps.

... Alan

Upvotes: 4

arx
arx

Reputation: 16896

Some of the commonly used performance values have API calls to get them directly. For example, the total processor time can be obtained from GetSystemTimes, and you can calculate the percentage yourself.

If this isn't an option then the Performance Data Helper library provides a moderately simple interface to performance data.

Upvotes: 0

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