090919(星期六):MFC消息路由4, Frame8代码分析3CWinApp的聚合情况

    技术2022-05-11  6

    一、Frame8程序main函数第4-7

    源码:

           CMyDoc* pMyDoc = new CMyDoc;

           CMyView* pMyView = new CMyView;

           CFrameWnd* pMyFrame = (CFrameWnd*)pApp->m_pMainWnd; //此处的m_pMainWnd = new CMyFrameWnd

           pMyFrame->m_pViewActive = pMyView;

           pMyView->m_pDocument = pMyDoc;

     

     

           CFrameWnd* pMyFrame = (CFrameWnd*)pApp->m_pMainWnd; //此处的m_pMainWnd

    m_pMainWnd在什么地方产生的?

    class CWinApp : public CWinThread

    {

    public:

           CWinApp* m_pCurrentWinApp;

           CWnd* m_pMainWnd;   //Applicaion是个大概念,包含一个CWnd

    public:

           CWinApp::CWinApp() {

                  m_pCurrentWinApp = this;

           }

    pAppCMyWinApp类型,其m_pMainWnd变量是在CMyWinApp::InitInstance生成的。

    BOOL CMyWinApp::InitInstance()

    {

           cout << "CMyWinApp::InitInstance /n";

           m_pMainWnd = new CMyFrameWnd;

           return TRUE;

    }

     

    class CFrameWnd : public CWnd

    {

    public:

           CView* m_pViewActive; // current active view

    public:

           CFrameWnd::CFrameWnd() {

           }

           CFrameWnd::~CFrameWnd() {

           }

          

     

    class CView : public CWnd

    {

    public:

           CDocument* m_pDocument;

     

    public:

           CView::CView() {

           }

           CView::~CView() {

           }

     

    总之的意思是CWinApp聚合CFrameWndCFrameWnd聚合CViewCView聚合CDocument


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