MFC学习笔记三——MFC程序的初始化过程_mfc 初始化顺序 create initial-优快云博客

本文介绍了一个基于MFC框架的应用程序示例，展示了从应用程序初始化到窗口创建的基本流程。通过具体的类定义和方法实现，读者可以了解到MFC中关键组件如CWinApp、CWnd和CFrameWnd的工作原理。

//------------------------------------------------------ // MFC.H //------------------------------------------------------ #define BOOL int #define TRUE 1 #define FALSE 0 #include <iostream> using namespace std; class CObject { public: CObject::CObject() { } CObject::~CObject() { } }; class CCmdTarget : public CObject { public: CCmdTarget::CCmdTarget() { } CCmdTarget::~CCmdTarget() { } }; class CWinThread : public CCmdTarget { public: CWinThread::CWinThread() { } CWinThread::~CWinThread() { } virtual BOOL InitInstance() { cout << "CWinThread::InitInstance /n"; return TRUE; } virtual int Run() { cout << "CWinThread::Run /n"; return 1; } }; class CWnd; class CWinApp : public CWinThread { public: CWinApp* m_pCurrentWinApp; CWnd* m_pMainWnd; public: CWinApp::CWinApp() { m_pCurrentWinApp = this; } CWinApp::~CWinApp() { } virtual BOOL InitApplication() { cout << "CWinApp::InitApplication /n"; return TRUE; } virtual BOOL InitInstance() { cout << "CWinApp::InitInstance /n"; return TRUE; } virtual int Run() { cout << "CWinApp::Run /n"; return CWinThread::Run();} }; class CDocument : public CCmdTarget { public: CDocument::CDocument() { } CDocument::~CDocument() { } }; class CWnd : public CCmdTarget { public: CWnd::CWnd() { } CWnd::~CWnd() { } virtual BOOL Create(); BOOL CreateEx(); virtual BOOL PreCreateWindow(); }; class CFrameWnd : public CWnd { public: CFrameWnd::CFrameWnd() { } CFrameWnd::~CFrameWnd() { } BOOL Create(); virtual BOOL PreCreateWindow(); }; class CView : public CWnd { public: CView::CView() { } CView::~CView() { } }; // global function CWinApp* AfxGetApp(); //------------------------------------------------------ // MY.H //------------------------------------------------------ #include <iostream> #include "mfc.h" class CMyWinApp : public CWinApp { public: CMyWinApp::CMyWinApp() { } CMyWinApp::~CMyWinApp() { } virtual BOOL InitInstance(); }; class CMyFrameWnd : public CFrameWnd { public: CMyFrameWnd(); ~CMyFrameWnd() { } }; //--------------------------------------------------------------- // MFC.CPP //--------------------------------------------------------------- #include "my.h" // 原该包含mfc.h 就好，但为了CMyWinApp 的定义，所以... extern CMyWinApp theApp; // external global object BOOL CWnd::Create() { cout << "CWnd::Create /n"; return TRUE; } BOOL CWnd::CreateEx() { cout << "CWnd::CreateEx /n"; PreCreateWindow(); return TRUE; } BOOL CWnd::PreCreateWindow() { cout << "CWnd::PreCreateWindow /n"; return TRUE; } BOOL CFrameWnd::Create() { cout << "CFrameWnd::Create /n"; CreateEx(); return TRUE; } BOOL CFrameWnd::PreCreateWindow() { cout << "CFrameWnd::PreCreateWindow /n"; return TRUE; } CWinApp* AfxGetApp() { return theApp.m_pCurrentWinApp; } //--------------------------------------------------------------- // MY.CPP //--------------------------------------------------------------- #include "my.h" CMyWinApp theApp; // global object BOOL CMyWinApp::InitInstance() { cout << "CMyWinApp::InitInstance /n"; m_pMainWnd = new CMyFrameWnd; return TRUE; } CMyFrameWnd::CMyFrameWnd() { cout << "CMyFrameWnd::CMyFrameWnd /n"; Create(); } //--------------------------------------------------------------- // main //--------------------------------------------------------------- void main() { CWinApp* pApp = AfxGetApp(); pApp->InitApplication(); pApp->InitInstance(); pApp->Run(); }

CWinApp::InitApplication

CMyWinApp::InitInstance

CMyFrameWnd::CMyFrameWnd

CFrameWnd::Create

CWnd::CreateEx

CFrameWnd::PreCreateWindow

CWinApp::Run

CWinThread::Run

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