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Summary: The following class implements the functionality of the QueryPerformanceCounter() and QueryPerformanceFrequency() API methods.
Language: C#
Author: Zepho Zep
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Culture: en-US
Bytes: 1089
Visual Studio 2005 Snippet:

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using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Threading;
namespace Win32
   internal class HiPerfTimer
      private static extern bool QueryPerformanceCounter(
         out long lpPerformanceCount);
      private static extern bool QueryPerformanceFrequency(
         out long lpFrequency);
      private long startTime, stopTime;
      private long freq;
      // Constructor
      public HiPerfTimer()
         startTime = 0;
         stopTime = 0;
         if (QueryPerformanceFrequency(out freq) == false)
            // high-performance counter not supported
            throw new Win32Exception();
      // Start the timer
      public void Start()
         // lets do the waiting threads there work
         QueryPerformanceCounter(out startTime);
      // Stop the timer
      public void Stop()
         QueryPerformanceCounter(out stopTime);
      // Returns the duration of the timer (in seconds)
      public double Duration
            return (double)(stopTime - startTime) / (double) freq;

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