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 working principle of the menu and the preparation of applications, menu commands in the MFC framework program several categories order and delivery process. Marking menu, the default menu implementation principle, the realization of graphical menus and often make mistakes, GetSystemMetrics applications, fast way to achieve its pop-up menu command response function range (with the pop-up menu with the specified parent window close the relationship between the bottom of the window has the highest priority sub-chance). Dynamic menu preparation, how to make the program run time create new menu items and how to manually generated for these new arrangements menu command handler, how to intercept the top floor window of the menu command processing, and further grasp the CString class applications.