vc高精度多媒体定时器的使用方法

#include "mmsystem.h"  //head file

#pragma comment(lib,"winmm")  //lib file

const    int        timePeriod = 2;
const    int        timeRes = 1 ;

/*******************MMTimer fuction********************************\
   CreateTimer :   create a Multimedia timer
   DestroyTimer:   destroy a Multimedia timer
   TimerHandler:   the actual timer handler procedure
\******************************************************************/

/******************************************************************\
  function
    name : CreateTimer
    desc : create a realtime timer
  argument
    void
  ret code
    [HANDLE] ,the handle of the timer
\******************************************************************/
UINT CMyTimer::CreateTimer()
{
    //create the timer
    
    // Create a periodic timer
    timeBeginPeriod(timeRes);
    timerID = timeSetEvent(
        timePeriod,
        timeRes,
        TimerHandler,
        (DWORD)this,
        TIME_PERIODIC);
    
    return timerID;
}

/******************************************************************\
  function
    name : DestroyTimer
    desc : destroy the timer created by calling CreateTimer
  argument
    void
  ret code
    void
\******************************************************************/
void CMyTimer::DestroyTimer()
{

    if ( bRun )
    {
        timeKillEvent(timerID);
        timeEndPeriod(timeRes);

        bRun = FALSE;
    }


}

/******************************************************************\
  function
    name : TimerHandler
    desc : timer procedure called when the the timer signaled
  argument
    dwUser,[in],user para data
  ret code
    void
\******************************************************************/

void CALLBACK CMyTimer::TimerHandler(UINT id, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
    CMyTimer* pThis = (CMyTimer*)dwUser;

}