用MFC建立多文档（MDI）应用程序。在主窗口中添加选项，使之能够选择文件夹。在子窗口中添加选项，使之能够对选定的文件夹进行操作，如：打开选定的文件夹中的文件、在选定的文件夹中写入指定的文本文件、在选定的文件夹中读出指定的文本文件、打开选定的文件夹中的文件夹。

附带有详尽的文档说明。-with MFC establishment of a multi-document (MDI) applications. In the main window to add options to enable them to choose folder. In the sub-window add options to enable it to the selected folder operate, such as : open the selected folder of documents in the selected documents into the folder specified text files, in the selected folder designated read out the text of the document, open the folder selected in the folder. With a detailed document shows.