说明：  这是一个ucGUI的虚拟键盘程序，可以在ucGUI3.90以上版本运行。与其它虚拟键盘不同的是，这里采用hook方式把按钮的动作挂到目标窗口，这样就可以动态的设定输入对象，完全不需要编写目标窗口的回调函数，非常方便。已经在stm32平台测试通过。
(This is a ucGUI virtual keyboard program, you can run ucGUI3.90 above. With other virtual keyboard is different is that here, using the action button hook way linked to the target window, so that you can dynamically set the input object, totally without the preparation of the target window' s callback function, very convenient. Has been stm32 platform test.)