InformIT: Visual C++ 6 Unleashed

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The `CWinApp` Class

Every true MFC application has a class derived from CWinApp. You can see how MFC AppWizard has done this for you by looking at the following sample from HiMom.h:

class CHiMomApp : public CWinApp
{
public:
    CHiMomApp();
// Overrides
    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CHiMomApp)
    public:
    virtual BOOL InitInstance();
    //}}AFX_VIRTUAL
// Implementation
    //{{AFX_MSG(CHiMomApp)
    afx_msg void OnAppAbout();
        // NOTE: ClassWizard will add and remove member functions here.
        // DO NOT EDIT what you see in these blocks of generated code !
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};

The first line shown here is what gives your application the real power of the MFC application framework. This is where the CHiMomApp class is derived from CWinApp. Apart from that, you will notice an awful lot of strange comments. These comments give the ClassWizard landmarks to find the pieces of the code that it manipulates.

CAUTION

You should notice the DO NOT EDIT warning in the comments. Although it is possible to change or add some things in these sections, it is not generally a good idea. The changes you make here may confuse ClassWizard to the point that you won't be able to use it to help manage your classes. If you feel you must make changes on ClassWizard's turf, it's best to try out ClassWizard right after you make the changes to see whether things still work. You should also realize that ClassWizard may change the code in these sections. If you ever want to use ClassWizard again, by all means do not delete these comments!

Just as your Application class derives from CWinApp, CWinApp itself is derived from a chain of other classes in the application architecture hierarchy, including CWinThread, CCmdTarget, and CObject.

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The CWinApp Class

The `CWinApp` Class