vc实现每隔一段时间进行提醒的功能。提醒层覆盖除任务栏之外的窗口。提醒的方式为透明层，由无到有再到消失。提醒的时间自定义。其中包含简单的托盘编程、定时器、透明层等内容-vc be reminded from time to time to achieve the function. In addition to the task bar to remind layer covering the outside of the window. Reminded of the way for a tr