MFC类层次结构

//MFC.h

#include <iostream>

using namespace std;



class CObject

{

public:

	CObject()

	{

		cout<<"CObject Constructor"<<endl;

	}

	~CObject()

	{

		cout<<"CObject Destructor"<<endl;

	}

};



class CCmdTarget : public CObject

{

public:

	CCmdTarget()

	{

		cout<<"CCmdtarget Constructor"<<endl;

	}

	~CCmdTarget()

	{

		cout<<"CCmdTarget Destructor"<<endl;

	}

};



class CWinThread : public CCmdTarget

{

public:

	CWinThread()

	{

		cout<<"CWinThread Constructor"<<endl;

	}

	~CWinThread()

	{

		cout<<"CWinThread Destructor"<<endl;

	}

};



class CWinApp : public CWinThread

{

public:

	CWinApp *m_pCurrentWinApp;//**************



public:

	CWinApp()

	{

		m_pCurrentWinApp = this;

		cout<<"CWinApp Constructor"<<endl;

	}

	~CWinApp()

	{

		cout<<"CWinApp Destructor"<<endl;

	}

};





class CWnd : public CCmdTarget

{

public:

	CWnd()

	{

		cout<<"CWnd Constructor"<<endl;

	}

	~CWnd()

	{

		cout<<"CWnd Destructor"<<endl;

	}

};





class CView : public CWnd

{

public:

	CView()

	{

		cout<<"CView Constructor"<<endl;

	}

	~CView()

	{

		cout<<"CView Destructor"<<endl;

	}

};





class CFrameWnd : public CWnd

{

public:

	CFrameWnd()

	{

		cout<<"CFrameWnd Constructor"<<endl;

	}

	~CFrameWnd()

	{

		cout<<"CFrameWnd Destructor"<<endl;

	}

};





class CDocument : public CCmdTarget

{

public:

	CDocument()

	{

		cout<<"CDocument Constructor"<<endl;

	}

	~CDocument()

	{

		cout<<"CDocument Destructor"<<endl;

	}

};



//global function

CWinApp* AfxGetApp();







//MY.h

#include <iostream>

#include "MFC.h"

using namespace std;



class CMyWinApp : public CWinApp

{

public:

	CMyWinApp()

	{

		cout<<"CMyWinApp Constructor"<<endl;

	}

	~CMyWinApp()

	{

		cout<<"CMyWinApp Destructor"<<endl;

	}

};



class CMyFrameWnd : public CFrameWnd

{

public:

	CMyFrameWnd()

	{

		cout<<"CMyFrameWnd Constructor"<<endl;

	}

	~CMyFrameWnd()

	{

		cout<<"CMyFrameWnd Destructor"<<endl;

	}

};





//MFC.cpp

#include "MY.h"



extern CMyWinApp theApp;



CWinApp* AfxGetApp()

{

	return theApp.m_pCurrentWinApp;

}





//MY.cpp

#include "MY.h"



CMyWinApp theApp;//global object



void main()

{

	CWinApp* pApp = AfxGetApp();

}