开发wps插件，实现在工具栏里添加按钮，当用户单击按钮时弹出UI供用户设置密级；在wps 文档原有内容上添加水印功能，防止泄密-Railway station mapping software: using GDI technology to CPicture as the base class, derived from various elements, each element produced Youyi rubber band class object as its member va