一种方便在全屏幕时使用的计时器的设计

对一个可以在全屏幕时方便查看时间的计时器的设计方法和原理进行了探讨，采用API函数监视鼠标运动、创建椭圆形窗口、保持窗口在屏幕最上方以便观察，设计自定义函数控制计时器窗口自动出现和隐藏，采用随机文件存储参数。本软件实现了对任意时段计算时间差值、到达规定时段系统提前预告、到达预定时间提示、全屏幕时隐藏，鼠标滑入出现。本软件为绿色软件，可以在不同Windows操作系统下运行，无需安装，直接在任何Windows操作系统上运行，适合在在不同教室使用的设计目标，是多媒体教学过程中一个方便的辅助工具。

Design of a Timer:Feasible in Full Screen

A timer adopted to be used in full screen was discussed in this paper.API function was used for mouse moving monitoring,ellipse-shaped form builtup and keep form in the upper position of screen.A user-defined function was established to control the timer window showing or hiding automatically.Time parameters were documented in a random file for further use.The timer realized the designed object:to calculate time duration,to foretell when reach a scheduled time,to hide itself when mouse leave off and appear when mouse move in.The timer is a green software,installation unnecessary,so it might run in any PC directly in different windows versions.This feature made it feasible to be used in frequently changed sites,for example,in often-changed classrooms.It is expected that the timer could be a helpful tool for multimedia assistant teaching.