QT：一种精确定时器类的实现与使用

最新推荐文章于 2025-09-02 08:59:55 发布

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最新推荐文章于 2025-09-02 08:59:55 发布 · 846 阅读

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#qt #开发语言

本文介绍了C++类CPreciseTimer，它支持高分辨率计时器和毫秒计时，提供StartTimer(),StopTimer()和GetTime()方法，用于精确测量时间间隔。

1）类的实现

#ifndef CPRECISETIMER_H
#define CPRECISETIMER_H

#include <windows.h>

class CPreciseTimer
{
public:
    CPreciseTimer();

    bool SupportsHighResCounter();
    void StartTimer();
    void StopTimer();
    __int64 GetTime();

private:
    //Auxiliary Function
    void UpdateElapsed();

    //Member variables
    bool m_bRunning;
    __int64 m_i64Start;
    __int64 m_i64Elapsed;

    //Some auxiliary variables
    __int64 m_i64Counts;
    LARGE_INTEGER m_liCount;

    //Static Variables
    static bool sm_bInit;
    static bool sm_bPerformanceCounter;
    static __int64 sm_i64Freq;
};

inline bool CPreciseTimer::SupportsHighResCounter()
{
    return sm_bPerformanceCounter;
}

//Auxiliary Function
inline void CPreciseTimer::UpdateElapsed()
{
    if(true == sm_bPerformanceCounter)
    {
        QueryPerformanceCounter(&m_liCount);
        m_i64Counts = ((__int64)m_liCount.HighPart << 32) + (__int64)m_liCount.LowPart;
        //Transf