主要传递文档类指针，因为在实际编程中文档类的m_pDoc经常在好多类中用到。-major transfer target file type, because the actual document Programming category m_pDoc frequently in many categories used.

主要传递文档类指针，因为在实际编程中文档类的m_pDoc经常在好多类中用到。-major transfer target file type, because the actual document Programming category m_pDoc frequently in many categories used.