用VC++编程，比较三种定时器——SetTimer、timeSetEvent、、QueryPerformanceCounter、GetTickCount的在精度上的差别-Using VC++ programming, comparing three types of timers- SetTimer, timeSetEvent,, QueryPerformanceCounter, GetTickCount the difference in accuracy

1.熟悉VC++ 6.0开发环境。 2.了解CTime类的使用方法。 3.掌握WM_TIMER消息映射方法。 4.掌握SetTimer函数和KillTimer函数的使用方法。-1. Be familiar with vc++ 6.0 development environment. 2. To understand the use of the CTime class. 3. Grasp the WM_TIMER message mapping method. 4. Ma