二、         MFC应用程序结构

在《明明白白看MFC之程序框架（一）》中我分析了一个经典的SDK应用程序的结构，现在可是要进入主题“MFC应用程序结构”了。MFC应用程序有好多种，为了能够更清楚地与前面的文章形成对比，我们在这里看一个SDI的应用程序，当然例子还是经典的“Hello World”了。在使用向导生成应用程序后，会发现有好几个文件，首先我们不管有哪些文件，按照程序执行得主线抽取主要的源程序分析一下再说（因为MFC生成的应用程序不是很方便阅读，所以在这里我将他们重新编辑了）。

CHelloWorldApp theApp;

int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

     LPTSTR lpCmdLine, int nCmdShow)

{

     CWinThread* pThread = AfxGetThread();

     CWinApp* pApp = AfxGetApp();

     // AFX internal initialization

     if (!AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow))

            goto InitFailure;

     // App global initializations (rare)

     if (pApp != NULL && !pApp->InitApplication())

            goto InitFailure;

     // Perform specific initializations

     if (!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:

……………………

     AfxWinTerm();

     return nReturnCode;

}

BOOL CWinApp::InitApplication()

{

     if (CDocManager::pStaticDocManager != NULL)

     {

            if (m_pDocManager == NULL)

                   m_pDocManager = CDocManager::pStaticDocManager;

            CDocManager::pStaticDocManager = NULL;

     }

     if (m_pDocManager != NULL)

            m_pDocManager->AddDocTemplate(NULL);

     else

            CDocManager::bStaticInit = FALSE;

     return TRUE;

}

BOOL CHelloWorldApp::InitInstance()

{

     AfxEnableControlContainer();

     ………………………………

     // Change the registry key under which our settings are stored.

     // TODO: You should modify this string to be something appropriate

     // such as the name of your company or organization.

     SetRegistryKey(_T("Local AppWizard-Generated Applications"));

     LoadStdProfileSettings();  // Load standard INI file options (including MRU)

     // Register the application's document templates.  Document templates

     //  serve as the connection between documents, frame windows and views.

     CSingleDocTemplate* pDocTemplate;

     pDocTemplate = new CSingleDocTemplate(

            IDR_MAINFRAME,

            RUNTIME_CLASS(CHelloWorldDoc),

            RUNTIME_CLASS(CMainFrame),       // main SDI frame window

            RUNTIME_CLASS(CHelloWorldView));

     AddDocTemplate(pDocTemplate);

     // Parse command line for standard shell commands, DDE, file open

     CCommandLineInfo cmdInfo;

     Pa

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