3.MFC的运行流程

来源：互联网发布：淘宝特卖入口编辑：程序博客网时间：2024/06/06 00:52

我们来了解一下MFC程序创建的流程, 一下代码在控制台程序中，模拟MFC的运行流程，每一个流程的内容是在控制台输出一些语句。

程序运行的结果如下：

类图结构：

上图便是 MFC 程序的运行流程

MFC.h

#pragma once#include<iostream>using namespace std;class CObject{public:};class CCmdTarget : public CObject{public:};class CWinThread : public CCmdTarget{public:virtual bool InitInstance(){cout << "CWinThread:InitInstance \n";return true;}virtual int Run(){cout << "CWinThread:Run \n";return 1;}};//先声音 CWnd类 因为在 CWinApp中需要用到，但是却没有 实际定义 CWnd这个类class CWnd;class CWinApp : public CWinThread{public:CWinApp* m_pCurrentWinApp;CWnd* m_pMainWnd;public:CWinApp::CWinApp(){m_pCurrentWinApp = this;}virtual bool InitInstance(){cout << "CWinApp:InitInstance \n";return true;}virtual int Run(){cout << "CWinApp:Run \n";return CWinThread::Run();}virtual bool InitApplication(){cout << "CWinApp:InitApplication \n";return true;}};class CDocument : public CCmdTarget{public:};class CWnd : public CCmdTarget{public:virtual bool Create();bool CreateEx();virtual bool PreCreateWindow();};class CView : public CWnd{public:};class CFrameWnd : public CWnd{public:bool Create();virtual bool PreCreateWindow();};CWinApp* AfxGetApp();

MFC.cpp

#include "my.h"extern CMyWinAPP theApp;CWinApp* AfxGetApp(){return theApp.m_pCurrentWinApp;}bool CWnd::Create(){cout << "CWnd::Create \n";return true;}bool CWnd::CreateEx(){cout << "CWnd::CreateEx \n";//PreCreateWindow 是虚函数，所以调用哪个类的PreCreateWindow是根据 传入的指针来确定的PreCreateWindow();return true;}bool CWnd::PreCreateWindow(){cout << "CWnd::PreCreateWindow \n";return true;}bool CFrameWnd::Create(){cout << "CFrameWnd::Create \n";//由于CFrameWnd 并没有重写 CreateEx 所以 调用父类的 CreateEx函数CreateEx();return true;}bool CFrameWnd::PreCreateWindow(){cout << "CFrameWnd::PreCreateWindow \n";return true;}

my.h

#include<iostream>#include"MFC.h"class CMyWinAPP :public CWinApp{public:bool InitInstance();};class MyFrameWnd:public CFrameWnd{public:MyFrameWnd::MyFrameWnd(){ cout << "MyFrameWnd::MyFrameWnd \n";//MyFrameWnd 并没有重写Create 所以 调用了 父类的Create函数Create();}};

my.cpp

#include"my.h"CMyWinAPP theApp;bool CMyWinAPP::InitInstance(){//让父类也初始化CWinApp::InitInstance();cout << "CMyWinAPP::InitInstance \n";m_pMainWnd = new MyFrameWnd();return true;}void main(){CWinApp *pApp = AfxGetApp();//初始化运行环境等工作pApp->InitApplication();//对给个类对象进行初始化工作pApp->InitInstance();//程序开始运行pApp->Run();system("pause");}

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