In this chapter, we'll use a class named CPersistentFrame that's derived from the CFrameWnd class. This CPersistentFrame class supports a persistent Single Document Interface (SDI) frame window that remembers the following characteristics:
Window size
Window position
Maximized status
Minimized status
Toolbar and status bar enablement and position
When you terminate an application that's built with the CPersistentFrame class, the above information is saved on disk in the Windows Registry. When the application starts again, it reads the Registry and restores the frame to its state at the previous exit.
You can use the persistent view class in any SDI application, including the examples in this book. All you have to do is substitute CPersistentFrame for CFrameWnd in your application's derived frame class files.