大家都知道,对于一个SDI,不管是新建还是打开一份文档,都会引发一系列的操作.

而我们的SDI开始运行时,都会自动先新建一份文档.确实它跟点击”新建”菜单项的操作是相同的.那么到底是在哪里自动调用这个菜单项的操作的呢?

到处都没找到.后来无意之间,在InitInstance中看到一个奇怪的家伙:

BOOL CManageApp::InitInstance()

{

       AfxEnableControlContainer();

       // Standard initialization

       // If you are not using these features and wish to reduce the size

       //  of your final executable, you should remove from the following

       //  the specific initialization routines you do not need.

#ifdef _AFXDLL

       Enable3dControls();                     // Call this when using MFC in a shared DLL

#else

       Enable3dControlsStatic();      // Call this when linking to MFC statically

#endif

       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(CManageDoc),

              RUNTIME_CLASS(CMainFrame),       // main SDI frame window

              RUNTIME_CLASS(CManageView));

       AddDocTemplate(pDocTemplate);

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

       CCommandLineInfo cmdInfo;

       ParseCommandLine(cmdInfo);

       // Dispatch commands specified on the command line

       if (!ProcessShellCommand(cmdInfo))

              return FALSE;

       // The one and only window has been initialized, so show and update it.

       m_pMainWnd->ShowWindow(SW_SHOW);

       m_pMainWnd->UpdateWindow();

       return TRUE;

}

这个函数到底是干吗的?带着这种疑问,我去安装文件中找到:

BOOL  CWinApp ::  ProcessShellCommand(CCommandLineInfo  &info)

{

       …….

       Switch (info .m_nshellCommand)

{

       Case  CComandLineInfo::FileNew:

      If(!AfxGetApp( ) - >OnCmdMsg( ID_FILE_NEW, 0 ,NULL , NULL))

                 OnFileNew( );

……..

}

原来如此!