CMultiDocTemplate* pDocTemplate;
 pDocTemplate = new CMultiDocTemplate(
  IDR_MDISQUTYPE,
  RUNTIME_CLASS(CSquaresDoc),
  RUNTIME_CLASS(CChildFrame), // custom MDI child frame
  RUNTIME_CLASS(CSquaresView));
 AddDocTemplate(pDocTemplate);
 
 // create main MDI Frame window
 CMainFrame* pMainFrame = new CMainFrame;
 if (!pMainFrame->LoadFrame(IDR_MAINFRAME))
  return FALSE;
 m_pMainWnd = pMainFrame;

。。。。。。。。

  // Dispatch commands specified on the command line
 if (!ProcessShellCommand(cmdInfo))
  return FALSE;

 // The main window has been initialized, so show and update it.
 pMainFrame->ShowWindow(m_nCmdShow);
 pMainFrame->UpdateWindow();

上面为MDI，下面为SDI

CSingleDocTemplate* pDocTemplate;
 pDocTemplate = new CSingleDocTemplate(
  IDR_MAINFRAME,
  RUNTIME_CLASS(CSquaresDoc),
  RUNTIME_CLASS(CMainFrame),       // main SDI frame window
  RUNTIME_CLASS(CSquaresView));
 AddDocTemplate(pDocTemplate);

。。。。。。。。。。

 // Dispatch commands specified on the command line
 if (!ProcessShellCommand(cmdInfo))
  return FALSE;

// The main window has been initialized, so show and update it.
 pMainFrame->ShowWindow(m_nCmdShow);
 pMainFrame->UpdateWindow();

主要是在生产文档模板对象时RUNTIME_CLASS(CChildFrame), // custom MDI child frame
VS  RUNTIME_CLASS(CMainFrame),       // main SDI frame window
MDI传递的是childframe,而SDI传递的mainframe，因此MDI的ProcessShellCommand创建的是ChildFrame而SDI创建的MainFrame，所以MDI中就多出了

// create main MDI Frame window
 CMainFrame* pMainFrame = new CMainFrame;
 if (!pMainFrame->LoadFrame(IDR_MAINFRAME))
  return FALSE;
 m_pMainWnd = pMainFrame;

必须自己创建MainFrame.

评论