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。-Menu works and preparation of applications, messaging menu command sequence and processes in several classes in the MFC framework program. Marking menus, implementation and analysis often make mistakes default menu implementation principle, graphic menus, GetSystemMetrics applications, fast implementations and the pop-up menu command response function effective range (with the pop-up menu, specify the parent window has a close The relationship between the bottom of the window that has the highest priority sub-chance). Write dynamic menus, how to make the program generated at runtime and how the new menu items manually generated for these new menu command arrangements handler, how to deal with the menu command intercepted on the top floor window, further grasp CString class applications.