一个打开窗体时候的特效代码，渐入渐出打开窗体，主要是使用 AnimateWindow函数实现，显示窗口特殊效果以及位图上下文菜单代码。-When the effects of a code to open the form, gradually getting out into the open form, is mainly achieved using AnimateWindow function, display window, special effects and bitmap con