QueryPerformanceTest.cpp

[詳解]

 
 
#include "pch.h"
#include "QueryPerformance.h"
 
using namespace Microsoft::VisualStudio::CppUnitTestFramework;
 
namespace WindowsLibraryTest
{
    TEST_CLASS (QueryPerformanceTest)
    {
    public:
        TEST_CLASS_INITIALIZE (ClassInitialize)
        {
            Logger::WriteMessage ("QueryPerformanceTest class initialize.\n");
        }
 
        TEST_CLASS_CLEANUP (ClassCleanup)
        {
            Logger::WriteMessage ("QueryPerformanceTest class cleanup.\n");
        }
 
        TEST_METHOD_INITIALIZE (MethodInitialize)
        {
            Logger::WriteMessage ("QueryPerformanceTest method initialize.\n");
        }
 
        TEST_METHOD_CLEANUP (MethodCleanup)
        {
            Logger::WriteMessage ("QueryPerformanceTest method cleanup.\n");
        }
 
        TEST_METHOD (QueryPerformance1)
        {
            const int count = 30;
            const DWORD cdwTime = 20;
            alt::QueryPerformance Q;
            TCHAR tszMsg[80];
            double dArray[count];
 
            for (int i = 0; i < count; i++)
            {
                Q.Start ();
                Sleep (cdwTime);
                Q.Stop ();
                dArray[i] = Q.PastTime ();
            }
 
            double sum = 0;
            double average = 0;
            double minValue = cdwTime;
            double maxValue = cdwTime;
            double sd = 0;
 
            for (int i = 0; i < count; i++)
            {
                sum += dArray[i];
                if (minValue > dArray[i]) minValue = dArray[i];
                if (maxValue < dArray[i]) maxValue = dArray[i];
            }
            average = sum / count;
 
            for (int i = 0; i < count; i++)
            {
                sd += pow (average - dArray[i], 2);
            }
            sd = pow (sd / count, 0.5);
 
            _stprintf_s (tszMsg, _T ("interval=%d minValue=%.4f maxValue=%.4f average=%.4f sd=%.4f\n"), cdwTime, minValue, maxValue, average, sd);
            Logger::WriteMessage (tszMsg);
 
            int outbound = 0;
            for (int i = 0; i < count; i++)
            {
                double diff = dArray[i] - cdwTime;
                if (-0.9 > diff || 0.9 < diff)
                {
                    outbound++;
                    _stprintf_s (tszMsg, _T ("i=%3d outbound=%3d diff=%.4f\n"), i, outbound, diff);
                    Logger::WriteMessage (tszMsg);
                }
            }
        }
    };
}