菜单的工作原理及编写应用，菜单命令消息在MFC框架程序的几个类中的传递顺序和处理过程。标记菜单、缺省菜单的实现原理、图形菜单的实现及常犯错误的分析，GetSystemMetrics的应用，快捷弹出菜单的实现方式及其命令响应函数有效范围（与弹出菜单时所指定的父窗口有密切的关系，最底层的子窗口具有最优先的处理机会）。动态菜单的编写，如何让程序在运行时产生新的菜单项及如何手工为这些新产生的菜单命令安排处理函数，如何在顶层窗口中截获对菜单命令的处理，更进一步掌握CString类的应用。

-The menu works and the preparation of the application, the menu command message delivery order and process in the the MFC framework program several classes. Marking menu default menu implementation principle, graphics menu and often make mistakes analysis the GetSystemMetrics application shortcut pop-up menu, the way to achieve their command response function of the effective range (specified in the pop-up menu in the parent window close the relationship between the bottom of the sub-window having the highest priority processing opportunities). Dynamic menu preparation, how to make the program at runtime to generate a new menu item and how to manually command arrangements for dealing with these new menu generated function, intercepted in the top-level window menu command, further mastered CString class.