MFC关键技术模拟（2）------MFC初始化过程

最新推荐文章于 2025-08-19 12:01:15 发布

原创最新推荐文章于 2025-08-19 12:01:15 发布 · 906 阅读

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#mfc #对象 #结构 #源码

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本文通过模拟MFC程序初始化过程，详细介绍了类继承关系及关键函数的调用流程。从全局对象构造到虚函数调用，逐步解析MFC应用程序启动过程。

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接上一篇：MFC关键技术模拟（1）

http://blog.youkuaiyun.com/bzhou830/article/details/25505291

上次仿真了MFC的类层次结构，这次开始仿真MFC程序的初始化过程。首先给出类的继承和包含的函数图表。这种图表方式可能相比资源框里面的那种方式更加容易理解。

按照这个图表，在上一次的源码上添加成员函数。

mfc.h

#include <iostream>

using namespace std;

class CObject
{
public:
	CObject::CObject()
	{
		cout<<"CObject Constructor"<<endl;
	}
	CObject::~CObject()
	{
		cout<<"CObject Destructor"<<endl;
	}
};


class CCmdTarget : CObject
{
public:
	CCmdTarget::CCmdTarget()
	{
		cout<<"CCmdTarget Constructor"<<endl; 
	}

	CCmdTarget::~CCmdTarget()
	{
		cout<<"CCmdTarget Destructor"<<endl; 
	}
};

class CWinThread : public CCmdTarget
{
public:
	CWinThread::CWinThread()
	{
		cout<<"CWinThread Constructor"<<endl; 
	}
	CWinThread::~CWinThread()
	{
		cout<<"CWinThread Destructor"<<endl; 
	}
    virtual void CWinThread::InitInstance()
	{
		cout<<"CWinThread::InitInstance"<<endl;
	}
    virtual int CWinThread::Run()
	{
		cout<<"CWinThread::Run"<<endl;
		return 1;
	}

};

class CWnd;    //因为CwinApp类中添加了CWnd*类型，故在此需要做说明                         

class CWinApp : public CWinThread
{
public:
	CWinApp * m_pCurrentWinApp;
	CWnd* m_pMainWnd;
public:
	CWinApp::CWinApp()
	{
		m_pCurrentWinApp = this;
		cout<<"CWinApp Constructor"<<endl; 
	}
	CWinApp::~CWinApp()
	{
		cout<<"CWinApp Destructor"<<endl; 
	}
	virtual void CWinApp::InitApplication()
	{
		cout<<"CWinApp::InitApplication"<<endl;
	}
	virtual void CWinApp::InitInstance()
	{
		cout<<"CWinApp::InitInstance"<<endl;
	}
	virtual int CWinApp::Run()
	{
		cout<<"CWinApp::Run"<<endl;
		return CWinThread::Run();
	}
};


class CDocument:public CCmdTarget
{
public:
	CDocument::CDocument()
	{
		cout<<"CDocument Constructor"<<endl;
	}
	CDocument::~CDocument()
	{
		cout<<"CDocument Destructor"<<endl;
	}
};

class CWnd:public CCmdTarget
{
public:
	CWnd::CWnd()
	{
		cout<<"CWnd Constructor"<<endl;
	}
	CWnd::~CWnd()
	{
		cout<<"CWnd Destructor"<<endl;
	}
	virtual void CWnd::Creat()
	{
		cout<<"CWnd::Creat"<<endl;
	}
	virtual void CWnd::PreCreatWindow()
	{
		cout<<"CWnd::PreCreatWindow"<<endl;
	}
	int CWnd::CreateEx()
	{
		cout<<"CWnd::CreateEx"<<endl;
		PreCreatWindow();
		return 1;
	}
};

class CFrameWnd:public CWnd
{
public:
	CFrameWnd::CFrameWnd()
	{
		cout<<"CFrameWnd Constructor"<<endl;
	}
	CFrameWnd::~CFrameWnd()
	{
		cout<<"CFrameWnd Destructor"<<endl;
	}
	void CFrameWnd::Creat()
	{
		cout<<"CFrameWnd::Creat"<<endl;
		CreateEx();
	}
	virtual void CFrameWnd::PreCreatWindow()
	{
		cout<<"CFrameWnd::PreCreatWindow"<<endl;
	}

};

class CView : public CWnd
{
public:
	CView::CView()
	{
		cout<<"CView Constructor"<<endl;
	}
	CView::~CView()
	{
		cout<<"CView Destructor"<<endl;
	}

};


CWinApp * AfxGetApp();

mfc.c

#include "my.h"

extern CMyWinApp theApp;


CWinApp * AfxGetApp()
{
	return theApp.m_pCurrentWinApp;
}

my.h

#include <iostream>
#include "mfc.h"

class CMyFrameWnd :public CFrameWnd
{
public:
	CMyFrameWnd::CMyFrameWnd()
	{
		Creat();
		cout<<"CMyFrameWnd Constructor"<<endl;
	}
	CMyFrameWnd::~CMyFrameWnd()
	{
		cout<<"CMyFrameWnd Destructor"<<endl;
	}
};

class CMyWinApp:public CWinApp
{
public:
	CMyWinApp::CMyWinApp()
	{
	   cout<<"CMyWinApp Constructor"<<endl;
	}
	CMyWinApp::~CMyWinApp()
	{
		cout<<"CMyWinApp Destructor"<<endl;
	}
	virtual void CMyWinApp::InitInstance()
	{
		cout<<"CMyWinApp::InitInstance"<<endl;
		m_pMainWnd = new CMyFrameWnd;
	}
};

my.c

#include "my.h"

CMyWinApp theApp;

void main()
{
	CWinApp* pApp = AfxGetApp();
	pApp->InitApplication();
	pApp->InitInstance();
	pApp->Run();
	system("pause");
}

运行的结果：