如何在MFC程序中添加一个登陆框

新建一个DIALOG,同时新建窗口类CDLGTEST
在应用程序的CCChapter13AApp::InitInstance（）函数中做如下修改
即在创建主框架之前显示CDLGTEST
BOOL CCChapter13AApp::InitInstance()
{
 。。。。。。。

 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.

 CDLGTEST dlgTest;
 if(dlgTest.DoModal() == IDOK)
 {
  CSingleDocTemplate* pDocTemplate;
  pDocTemplate = new CSingleDocTemplate(
   IDR_MAINFRAME,
   RUNTIME_CLASS(CCChapter13ADoc),
   RUNTIME_CLASS(CMainFrame),       // main SDI frame window
   RUNTIME_CLASS(CCChapter13AView));
  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;
}