在Windows和VxWorks平台下,观察者模式C++实用实现.-In Windows and VxWorks platforms, the observer model C++ Practical realization.

视觉暂留，编程从一个I/O口输出一扫频信号，驱动一支LED灯闪动，频率范围为10HZ~99HZ，扫描时间为30秒，在LED闪动期间观察，一旦发现无法识别LED灯闪动时，按下按键K1，立即停止输出，并将此时的信号频率显示在数码管上，该信号的周期为测试者的视觉暂留时间。-Persistence of vision, programming from an I/O port outputs a sweep signal to drive an LED light flashing, the frequ

观察者设计模式，目前应用非常广泛，计划是设计程序的必备结构(Observer design patterns are very widely used these days. Planning is the necessary structure of the design process)