windows编程中难不了要定时器，包中的七种定时器，有简单的、有精密的，满足你的编程中的各种需求。-windows programming is difficult not to timers, including the seven timers, there are simple, there are sophisticated to meet your programming needs.

控制精密定时器函数 ShutterOn（）(Shutter Control param=0 to close shutter param=1 to open shutter)