Timer计时器可以精确到毫秒

// Timer.cpp: implementation of the Timer class. // ////////////////////////////////////////////////////////////////////// //#include "stdafx.h" #include "Timer.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// Timer::Timer() { QueryPerformanceFrequency(&tTC); pause = false; tPause = 0; } Timer::~Timer() { } void Timer::Start() { QueryPerformanceCounter(&tStart); } void Timer::Stop() { LARGE_INTEGER tTemp; QueryPerformanceCounter(&tStop); if(pause) { tPauseStop.QuadPart = tStop.QuadPart; tTemp = CalculateTime(tPauseStart, tPauseStop); tPause += tTemp.QuadPart; pause = false; } tTemp = CalculateTime(tStart, tStop); tTimer = tTemp.QuadPart; } _int64 Timer::GetTimer() { return tTimer-tPause; } LARGE_INTEGER Timer::CalculateTime(LARGE_INTEGER tLow, LARGE_INTEGER tUp) { LARGE_INTEGER t; t.QuadPart = tUp.QuadPart - tLow.QuadPart; t.QuadPart*=1000; t.QuadPart = t.QuadPart/tTC.QuadPart; return t; } void Timer::Pause() { pause = true; QueryPerformanceCounter(&tPauseStart); }