MFC 文档视图

When an application runs under Microsoft Windows, the user interacts with documents displayed in frame windows. A document frame window has two major components: the frame and the contents that it frames. A document frame window can be a single document interface (SDI) frame window or a multiple document interface (MDI) child window. ——摘自MSDN

类结构

SDI Application仅仅使用一个框架窗口（顶层框架窗口）作为应用程序的主窗口并包含打开文档的视图；MDI Application具有两个窗口:顶层框架窗口以及“子框架窗口”（也称文档框架窗口），子框架窗口在顶层框架窗口中浮动，用来包含打开文档的视图。

 

 

消息映射与命令传递