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Posted 11 Apr 2000

The CPerfTimer timer class

, 27 Apr 2000
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This class encapsulates QueryPerformanceCounter for high precision timing
  • Download source files - 3 Kb
  • Updated: the class is now thread safe.

    High resolution timing is supported in Win32 by the QueryPerformanceCounter and QueryPerformanceFrequency API calls. The timer resolution varies with the processor. Today's high speed processors have a timer resolution of less than a microsecond. Of course, this is a much better resolution than the GetTickCount API!

    Using the QueryPerformanceCounter calls directly takes too much typing and the resulting code is usually hard to read. So, I looked all over the net for a timer class but I could not find one that suited me. I wrote a simple and powerful timer class and named it CPerfTimer. I wrote this a long time ago but I still have not had the need to update it. Searching the net I could not find a timer class as simple to use and as useful as CPerfTimer. Several other timer classes are available and they vary as to their simplicity and usefulness. I do not claim that this is the end-all-be-all of timer classes; but, I hope that someone will find it useful enough to refrain from taking the time to write yet another timer class.

    This class is simple to use. Just declare a variable as type CPerfTimer, call Start() to start timing and call Stop() to stop timing. You can pause a timer by calling Stop() and then you can call Start() to resume. Retrieve the elapsed time by calling an Elapsed...() function. Assignment, addition, subtraction and comparison are supported. There are a few information calls available also. All calls except Start and Stop can be performed on a timer without stopping it.

    I have not included separate documentation or example application. The code is fairly well documented and the above paragraph was copied from the CPerfTimer.h file. Methods for adding, subtracting and comparing CPerfTimers and seconds (double) are also included. And, a CPerfTimerT class that should be thread safe (no extensive testing has been done). Please inform me if any bugs are found or you have an idea for an enhancement.


    This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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    About the Author

    Dean Wyant
    Web Developer
    United States United States
    No Biography provided

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    Comments and Discussions

    QuestionJava timer? Pin
    sharonr117-Dec-02 3:21
    susssharonr117-Dec-02 3:21 
    QuestionLicense ? Pin
    George13-Nov-02 20:30
    memberGeorge13-Nov-02 20:30 
    AnswerRe: License ? Pin
    Dean Wyant16-Nov-02 4:48
    memberDean Wyant16-Nov-02 4:48 
    GeneralRe: License ? Pin
    George16-Nov-02 5:51
    memberGeorge16-Nov-02 5:51 
    GeneralPerformance Issue Pin
    AllanK6-Jan-03 8:19
    memberAllanK6-Jan-03 8:19 
    GeneralRe: Performance Issue Pin
    Dean Wyant9-Jan-03 13:50
    memberDean Wyant9-Jan-03 13:50 
    QuestionIs it a Timer or a TimeCounter? Pin
    miliu15-Sep-02 17:35
    sussmiliu15-Sep-02 17:35 
    AnswerRe: Is it a Timer or a TimeCounter? Pin
    Dean Wyant19-Sep-02 9:14
    memberDean Wyant19-Sep-02 9:14 
    OK, some timers can execute a function (send a message etc.) at a specified time or periodically. This timer does not. It is for keeping track of elapsed time only. An encapsulation of the Windows API performance counter calls. Sorry for the confusion.
    GeneralLack of stdafx.h file. Pin
    Kisa13-Aug-02 5:37
    memberKisa13-Aug-02 5:37 
    GeneralRe: Lack of stdafx.h file. Pin
    Kisa14-Aug-02 0:33
    memberKisa14-Aug-02 0:33 
    GeneralRe: Lack of stdafx.h file. Pin
    Dean Wyant16-Aug-02 4:25
    memberDean Wyant16-Aug-02 4:25 
    GeneralRe: Lack of stdafx.h file. Pin
    priyanair5-Apr-04 13:41
    memberpriyanair5-Apr-04 13:41 
    GeneralRe: Lack of stdafx.h file. Pin
    Dean Wyant7-Apr-04 14:40
    memberDean Wyant7-Apr-04 14:40 
    QuestionError Message ?? Pin
    Anonymous18-Mar-02 7:58
    memberAnonymous18-Mar-02 7:58 
    AnswerRe: Error Message ?? Pin
    Dean Wyant21-Mar-02 4:34
    memberDean Wyant21-Mar-02 4:34 
    Generalexample please Pin
    Ramy8-Dec-01 20:05
    memberRamy8-Dec-01 20:05 
    GeneralRe: example please Pin
    Dean Wyant9-Dec-01 9:38
    memberDean Wyant9-Dec-01 9:38 
    GeneralRe: example please Pin
    Ramy10-Dec-01 16:06
    memberRamy10-Dec-01 16:06 
    GeneralTimer runs to quick Pin
    Rob Ottenhoff5-Mar-01 0:01
    memberRob Ottenhoff5-Mar-01 0:01 
    GeneralRe: Timer runs to quick Pin
    Anonymous5-Mar-01 6:04
    memberAnonymous5-Mar-01 6:04 
    GeneralUsage Notes Pin
    Dean27-Jan-01 11:15
    memberDean27-Jan-01 11:15 
    GeneralVery useful... Pin
    kabir5-Sep-00 0:37
    susskabir5-Sep-00 0:37 
    GeneralThe poor rating was due to compile problem - update should be posted soon Pin
    Dean Wyant14-Apr-00 22:44
    sussDean Wyant14-Apr-00 22:44 
    GeneralUpdated posted Pin
    Chris Maunder14-Apr-00 22:50
    sussChris Maunder14-Apr-00 22:50 

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