一个MFC程序启动机制。AFX_MODULE_STATE* pModuleState = _AFX_CMDTARGET_GETSTATE(); aaa//当前程序模块信息class AFX_MODULE_STATE : public CNoTrackObject#ifdef _AFXDLL#define _AFX_CMDTARGET_GETSTATE() (m_pModuleState)#else#define _AFX_CMDTARGET_GETSTATE() (AfxGetModuleState())#endifCMyWinApp theApp{AFX_MODULE_STATE* pModuleState = _AFX_CMDTARGET_GETSTATE();//获取全局变量模块状态aaaAFX_MODULE_THREAD_STATE* pThreadState = pModuleState->m_thread;//获取全局变量线程状态信息bbbpThreadState->m_pCurrentWinThread = this;//将theApp地址赋值给aaa对象}CWinThread* AFXAPI AfxGetThread(){// check for current thread in module thread stateAFX_MODULE_THREAD_STATE* pState = AfxGetModuleThreadState();//以Afx开头的都是全局的获取全局变量BBB的地址CWinThread* pThread = pState->m_pCurrentWinThread;//CMyWinApp–>CWinApp–>CWinThread–>CCmdTarget–>CObject//基类指针指向孙子类// if no CWinThread for the module, then use the global appif (pThread == NULL)pThread = AfxGetApp();return pThread;}_AFXWIN_INLINE CWinApp* AFXAPI AfxGetApp()//获取全局对象{ return afxCurrentWinApp; }#define afxCurrentWinApp AfxGetModuleState()->m_pCurrentWinApppThreadModule->m_pCurrentWinThread=thisMFC第一大机制MFC程序启动机制第一个MFC程序环境配置:删除WinMain函数将包含的头文件改为<afxwin.h>project->Settings中使用MFC库代码编写从CFrameWnd类派生自己的子类CMyFrameWnd从CWinApp类派生自己的子类CMtWinApp在CMyWinApp类内部重写父类的成员虚函数IninInstance全局域中定义一个全局对象CMyWinApp theApp(爆破点)程序执行过程:1.mfc封装WinMain所以程序不需要实现2.构造theApp全局对象,执行CWinApp类的构造函数1)将theApp对象地址保存到当前程序模块状态信息中2)将theApp对象地址保存到当前程序线程状态信息中3)AfxGetThread/AfxGetApp –返回theApp对象地址3.进入WinMain函数，其直接调用AfxWinMain函数1)AfxWinMain执行过程1)获取theApp地址2)利用theApp对象地址调用InitApplication虚函数初始化MFC应用程序3)利用theApp对象地址调用InitInstance虚函数，创建、显示、刷新 窗口4)利用theApp对象设置调用Run虚函数，实现消息循环5)程序退出时利用theApp对象地址调用ExiyInstance虚函数,善后处理。应用程序类(CWinApp)成员虚函数InitApplicationInitInstanceOnIdelRunExitInstance成员变量m_pMainWndtheApp—>m_pMainWndMFC类库中没有对象，只有类**********************************************************************WinMain(…){AfxWinMain(….){CWinThread* pThread = AfxGetThread();////theApp地址CWinApp* pApp = AfxGetApp();////theApp地址//以上两句获取theApp对象地址AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow)//初始化MFC库pApp->InitApplication()//theApp–>虚函数//重写后执行流程会改变，执行自己的函数//实为CWinApp的pThread->InitInstance()//回到自己写的代码 重写改变执行流程//this指针为theApp对象地址.pThread值为theApp//InitInstance由pThread调用nReturnCode = pThread->Run();{//this==pThread==theApp还是theAppCWinThread::Run();{//函数内部this指针为theApp地址while(没有消息){空闲处理ths->OnIdel();//空闲处理}PumpMessage(){pump 打气筒，抽取if(GetMessage抓到WM_QUIT){return FALSE;}}if(PumpMessage返回FALSE){ExitInstance();//应用程序类的虚函数，，善后处理}}}}}一直由theApp对象指针调用虚函数***************************************************************************CMyWinApp theApp;BOOL CMyWinApp::InitInstance(){//this======theAppCMyFrameWnd *pFrame=new CMyFrameWnd();//框架类对象pFrame->Create(NULL,"MyFrame");//创建+注册m_pMainWnd=pFrame;//this->m_pMainWnd保存框架类对象地址pFrame->ShowWindow(SW_SHOW);//目测为CWinApp类的成员pFrame->UpdateWindow();//成员函数由theApp调用return TRUE;}int CWinApp::Run(){if (m_pMainWnd == NULL && AfxOleGetUserCtrl()){// Not launched /Embedding or /Automation, but has no main window!TRACE0("Warning: m_pMainWnd is NULL in CWinApp::Run – quitting application.\n");AfxPostQuitMessage(0);//退出程序}return CWinThread::Run(); this->CWinAppThread::Run();}BOOL CWinThread::PumpMessage(){ASSERT_VALID(this);if (!::GetMessage(&m_msgCur, NULL, NULL, NULL)){#ifdef _DEBUGif (afxTraceFlags & traceAppMsg)TRACE0("CWinThread::PumpMessage – Received WM_QUIT.\n");m_nDisablePumpCount++; // application must die// Note: prevents calling message loop things in 'ExitInstance'// will never be decremented#endifreturn FALSE;}#ifdef _DEBUGif (m_nDisablePumpCount != 0){TRACE0("Error: CWinThread::PumpMessage called when not permitted.\n");ASSERT(FALSE);}#endif#ifdef _DEBUGif (afxTraceFlags & traceAppMsg)_AfxTraceMsg(_T("PumpMessage"), &m_msgCur);#endif// process this messageif (m_msgCur.message != WM_KICKIDLE && !PreTranslateMessage(&m_msgCur)){::TranslateMessage(&m_msgCur);::DispatchMessage(&m_msgCur);}return TRUE;}int CWinThread::Run(){ASSERT_VALID(this);// for tracking the idle time stateBOOL bIdle = TRUE;LONG lIdleCount = 0;// acquire and dispatch messages until a WM_QUIT message is received.for (;;){// phase1: check to see if we can do idle workwhile (bIdle &&!::PeekMessage(&m_msgCur, NULL, NULL, NULL, PM_NOREMOVE))//没消息时//进入while循环//::表示win32函数{// call OnIdle while in bIdle stateif (!OnIdle(lIdleCount++))//this->OnIdel(空闲次数)OnIdel()前没有::,是成员函数bIdle = FALSE; // assume "no idle" state}// phase2: pump messages while availabledo{// pump message, but quit on WM_QUITif (!PumpMessage())return ExitInstance();//this->ExitInstance() theApp//应用程序类的成员虚函数//点击关闭按钮出发的事件// reset "no idle" state after pumping "normal" messageif (IsIdleMessage(&m_msgCur)){bIdle = TRUE;lIdleCount = 0;}} while (::PeekMessage(&m_msgCur, NULL, NULL, NULL, PM_NOREMOVE));}ASSERT(FALSE); // not reachable}int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPTSTR lpCmdLine, int nCmdShow){ASSERT(hPrevInstance == NULL);int nReturnCode = -1;CWinThread* pThread = AfxGetThread();////theApp地址CWinApp* pApp = AfxGetApp();////theApp地址// AFX internal initializationif (!AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow))//初始化MFC库goto InitFailure;// App global initializations (rare)if (pApp != NULL && !pApp->InitApplication())goto InitFailure;// Perform specific initializationsif (!pThread->InitInstance()){if (pThread->m_pMainWnd != NULL){TRACE0("Warning: Destroying non-NULL m_pMainWnd\n");pThread->m_pMainWnd->DestroyWindow();}nReturnCode = pThread->ExitInstance();goto InitFailure;}nReturnCode = pThread->Run();InitFailure:#ifdef _DEBUG// Check for missing AfxLockTempMap callsif (AfxGetModuleThreadState()->m_nTempMapLock != 0){TRACE1("Warning: Temp map lock count non-zero (%ld).\n",AfxGetModuleThreadState()->m_nTempMapLock);}AfxLockTempMaps();AfxUnlockTempMaps(-1);#endifAfxWinTerm();return nReturnCode;}
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