微秒级计时器类

最新推荐文章于 2025-05-19 16:10:44 发布

lxf51052743

最新推荐文章于 2025-05-19 16:10:44 发布

阅读量1.2k

点赞数

CC 4.0 BY-SA版权

分类专栏： C++实用源代码文章标签： integer delay

本文链接：https://blog.youkuaiyun.com/lxf51052743/article/details/3079079

C++实用源代码专栏收录该内容

1 篇文章

订阅专栏

本文介绍了一个基于Windows平台的微秒级定时器类CTimer，该类利用QueryPerformanceCounter和QueryPerformanceFrequency函数实现高精度的时间测量和延迟。通过将所需延迟时间转换为CPU周期数，并不断检查当前CPU周期数来达到指定的延迟。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

//Timer.h

#include <windows.h>

class CTimer
{
public:
CTimer(void);
~CTimer(void);

void Delay(DWORD dwMicrosecond);

void TimeBegin(void);
void TimeEnd(void);

DWORD GetTimeValue(void) const;

void Reset(void);

private:
LARGE_INTEGER m_i64CPUFreq;

LARGE_INTEGER m_i64Begin;
LARGE_INTEGER m_i64End;

};

//Timer.cpp

#include <algorithm>
using namespace std;

#include "Timer.h"

CTimer::CTimer(void)
{
QueryPerformanceFrequency(&m_i64CPUFreq);
}

CTimer::~CTimer(void)
{
}

/////////////////////////////////////////////////////////////////////////////
// 延时N微秒

void CTimer::Delay(DWORD dwMicrosecond)
{
const DWORD dwSToUs = 1000000L;

const DWORD dwMsToUs = 1000;

DWORD dwS, dwMs, dwUs, dwResidue;
LARGE_INTEGER i64TickCount;

dwS = dwMicrosecond / dwSToUs;
dwResidue = dwMicrosecond % dwSToUs;

dwMs = dwResidue / dwMsToUs;
dwUs = dwResidue % dwMsToUs;

    i64TickCount.QuadPart = dwS * m_i64CPUFreq.QuadPart
                          + dwMs * m_i64CPUFreq.QuadPart / dwMsToUs
                          + dwUs * m_i64CPUFreq.QuadPart / dwSToUs;

LARGE_INTEGER i64Begin, i64End, i64CurrentTick;

     QueryPerformanceCounter(&i64Begin);

    i64End.QuadPart = i64Begin.QuadPart + i64TickCount.QuadPart;

    do
    {
    QueryPerformanceCounter(&i64CurrentTick);
    } while (i64CurrentTick.QuadPart <= i64End.QuadPart);

    return;
}

/////////////////////////////////////////////////////////////////////////////
// 计时开始

void CTimer::TimeBegin(void)
{
QueryPerformanceCounter(&m_i64Begin);
}

/////////////////////////////////////////////////////////////////////////////
// 计时结束

void CTimer::TimeEnd(void)
{
QueryPerformanceCounter(&m_i64End);
}

/////////////////////////////////////////////////////////////////////////////

//得到时间值,返回微秒数

DWORD CTimer::GetTimeValue(void) const
{
    DWORD dwTotalMicrosecond = 0;
    LARGE_INTEGER i64TickCount;
    i64TickCount.QuadPart = m_i64End.QuadPart - m_i64Begin.QuadPart;
    dwTotalMicrosecond = i64TickCount.QuadPart * 1000000 / m_i64CPUFreq.QuadPart;

return dwTotalMicrosecond;
}

/////////////////////////////////////////////////////////////////////////////
// 复位计时器

void CTimer::Reset(void)
{
m_i64Begin = m_i64End;
}