能够在单文档MFC界面中实现一个钟表时钟的界面，要与系统时间保持同步 思路：在应用程序中经常有些任务需要后台处理，实现的办法由两种：计时器和OnIdle循环处理。 -Can in a single document MFC interface implementation in a clocks and watches clock interface, to keep pace with the system time Idea: in applications often some