QueryPerformance.cpp

[詳解]

// ----------------------------------------------------------------------------
 
#include "pch.h"
#include "QueryPerformance.h"
 
using namespace alt;
 
QueryPerformance::QueryPerformance ()
{
    _startTick.QuadPart = 0;
    _stopTick.QuadPart = 0;
    ::QueryPerformanceFrequency (&_frequency);
}
 
VOID QueryPerformance::Start ()
{
    ::QueryPerformanceCounter (&_startTick);
}
 
VOID QueryPerformance::Stop ()
{
    ::QueryPerformanceCounter (&_stopTick);
}
 
double QueryPerformance::PastTime () const
{
    return (_stopTick.QuadPart - _startTick.QuadPart) * 1000.0 \
        / (double)_frequency.QuadPart;
}