CFrameWindowImpl

CFrameWindowImpl is a class in the Microsoft Foundation Class (MFC) library, which is a C++ library used for developing Windows applications. It is a part of the MFC's support for creating frame windows, which are the main windows of an application. CFrameWindowImpl is a template class that provides a base implementation for frame windows, allowing developers to create custom frame windows with specific behaviors and appearances.

The class inherits from CWnd, the base class for all windows in MFC, and provides additional functionality for managing the frame window's title bar, menu bar, and other components. It also supports the creation of child windows and the handling of messages sent to the frame window.

CFrameWindowImpl is typically used as a base class for custom frame window classes in MFC applications. Developers can derive their own classes from CFrameWindowImpl and override its virtual functions to customize the behavior of the frame window. For example, they can override the OnCreate function to perform custom initialization when the frame window is created, or the OnCommand function to handle menu commands.

The class also provides functions for manipulating the frame window's appearance, such as setting the window's title, enabling or disabling the menu bar, and showing or hiding the window's components. These functions allow developers to create frame windows that meet the specific needs of their applications.

In summary, CFrameWindowImpl is a versatile and powerful class in the MFC library that provides a base implementation for frame windows. It allows developers to create custom frame windows with specific behaviors and appearances, and to handle messages and commands sent to the frame window. By deriving their own classes from CFrameWindowImpl, developers can create frame windows that are tailored to the needs of their applications.