Visual C++ and MFC Programming 2nd Edition

Chapter 5: The Document/View Architecture Visual C++ and MFC Fundamentals

BOOL CExerciseDoc::OnNewDocument()

{

return CDocument::OnNewDocument();

}

CExerciseApp theApp;

4. Test the application. Change the content of the empty file and save it


5. Close the application and return to MSVC.

5.3.3 SDI Improvements: The Frame.........................................................

The CWnd::OnCreate() method is used to create a window and it is usually meant to do

this using its default configured features. Therefore, anything you want to display on the

frame when the application displays, you can do so when creating the application.

Therefore, the frame is typically used to create and display the toolbar(s), dialog bar(s),

and status bar.

After the frame has been created, if you want to modified something on it, you can do so

after it has been created but before it is displayed to the user. To do this, you can use the

PreCreateWindow() method of the CWnd class. Its syntax is:

virtual void PreCreateWindow(CREATESTRUCT& cs);

This method takes a reference to CREATESTRUCT class, modifies and returns it with

the new characteristics. For example, you can use this method to remove the Minimize

and the Maximize system buttons on the title bar as follows:

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)

{

cs.style &= ~(WS_MAXIMIZEBOX | WS_MINIMIZEBOX);

return CFrameWnd::PreCreateWindow(cs);

}

Practical Learning: Improving the Frame

1. To use the CWnd::PreCreateWindow() virtual method, in the header file, declare it
   as follows:

class CMainFrame : public CFrameWnd

{

DECLARE_DYNCREATE(CMainFrame)

afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

virtual BOOL PreCreateWindow(CREATESTRUCT& cs);

DECLARE_MESSAGE_MAP()

};

2. To modify the dimensions of the window at start up, implement the method as
   follows: