直接用API编按钮,其实按钮和很多控件一样,都是windows子窗口.有了这个窗口可以有很多方法.用api函数编是很基层的方法,API for direct use of the button, in fact, a lot of buttons and controls, are sub-windows window. With this method there can be many windows. Api function used for grass-roots approach i