www.pudn.com > mmTimers_src.rar > mmTimers.cpp

#include	"StdAfx.h" 
#include	"mmTimers.h" 
 
 
CMMTimers::CMMTimers(UINT resolution) : timerRes(0), timerId(0) 
{ 
	TIMECAPS	tc; 
 
	if (TIMERR_NOERROR == timeGetDevCaps(&tc,sizeof(TIMECAPS))) 
	{ 
		timerRes = min(max(tc.wPeriodMin,resolution),tc.wPeriodMax); 
		timeBeginPeriod(timerRes); 
	} 
} 
 
 
CMMTimers::~CMMTimers() 
{ 
	stopTimer(); 
	if (0 != timerRes) 
	{ 
		timeEndPeriod(timerRes); 
		timerRes = 0; 
	} 
} 
 
 
extern "C" 
void 
CALLBACK 
internalTimerProc(UINT id,UINT msg,DWORD dwUser,DWORD dw1,DWORD dw2) 
{ 
	CMMTimers *	timer = (CMMTimers *)dwUser; 
 
	timer->timerProc(); 
} 
 
 
bool CMMTimers::startTimer(UINT period,bool oneShot) 
{ 
	bool		res = false; 
	MMRESULT	result; 
 
	result = timeSetEvent(period,timerRes,internalTimerProc,(DWORD)this,oneShot ? TIME_ONESHOT : TIME_PERIODIC); 
	if (NULL != result) 
	{ 
		timerId = (UINT)result; 
		res = true; 
	} 
 
	return res; 
} 
 
 
bool CMMTimers::stopTimer() 
{ 
	MMRESULT	result; 
 
	result = timeKillEvent(timerId); 
	if (TIMERR_NOERROR == result) 
		timerId = 0; 
 
	return TIMERR_NOERROR == result; 
}