C++ VC MFC 简单定时器

// IntervalTimer.cpp: implementation of the CIntervalTimer class. // ////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "IntervalTimer.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CIntervalTimer::CIntervalTimer() { m_bTimerStart = false; } CIntervalTimer::CIntervalTimer(const CIntervalTimer &src) { m_StartTime = src.m_StartTime; m_Interval = src.m_Interval; m_bTimerStart = true; } CIntervalTimer& CIntervalTimer::operator = (const CIntervalTimer &src) { m_StartTime = src.m_StartTime; m_Interval = src.m_Interval; m_bTimerStart = src.m_bTimerStart; return *this; } //开始计数 void CIntervalTimer::Start(int interval) { m_bTimerStart = true; m_StartTime = GetTickCount(); m_Interval = interval > 0 ? interval : 100; m_Elapse = 0; }; //停止计时 void CIntervalTimer::Stop() { m_bTimerStart = false; m_StartTime = 0; m_Interval = 0; } //判断时间是否已经到 bool CIntervalTimer::Timeout() { if (m_bTimerStart) { m_Elapse = _GetMilliSeconds(m_StartTime); return m_Elapse >= m_Interval; } return false; } //获得启动后的毫秒秒数 DWORD CIntervalTimer::_GetMilliSeconds(DWORD dwStartTime) { DWORD ret = 0; DWORD nowtick = GetTickCount(); if (nowtick >= dwStartTime) { ret = nowtick - dwStartTime; } else { ret = ((DWORD)0xffffffff) - dwStartTime + nowtick; } return ret; } void CIntervalTimer::TraceInfo(const char *szPrefix) { ASSERT(szPrefix != NULL); TRACE("***%s*** StartTime=%d, Interval=%d, Elapse=%d\n", szPrefix, m_StartTime, m_Interval, m_Elapse); }