Using 2 views for a single document


In order to use more than 1 views for a singel document, one should add another document template. If adding this snippet code to InitInstance() directly, one would encounter a dialog to select different documents although you only have one type of document. Commonly, there are 2 methods to avoid this dialog: first is to declaim different resource ID for the second document template, and blabla…; second is to add the second doucment template to other place other than the InitInstance(). See:
BOOL CPhotograph2App::OnDstTemplate()
{
 pDstTemplate = new CMultiDocTemplate(IDR_Photograph2TYPE,
  RUNTIME_CLASS(CPhotograph2Doc),
  RUNTIME_CLASS(CChildFrame), // custom MDI child frame
  RUNTIME_CLASS(CDstView));
  
 if (!pDstTemplate)
    return FALSE;
 AddDocTemplate(pDstTemplate);          
  
 ASSERT_VALID(pDstTemplate); 
 return TRUE;
}
 
Then you can create the view when necessary. Remember to InitialUpdateFrame after CreateNewFrame.
// CMainFrame message handlers
BOOL CMainFrame::OnDstWindow()
{
   CMDIChildWnd* pActiveChild = MDIGetActive();
   CDocument* pDocument;
  
   if (pActiveChild == NULL ||
      (pDocument = pActiveChild->GetActiveDocument()) == NULL) {
      TRACE0("Warning: No active document for WindowNew command.\n");
      AfxMessageBox(AFX_IDP_COMMAND_FAILURE);
      return FALSE;     // command failed
   }
  
 CPhotograph2App*  pApp = (CPhotograph2App*)AfxGetApp();  
 ASSERT_POINTER(pApp, CPhotograph2App);
   //CDocTemplate* pTemplate = pDocument->GetDocTemplate();
   CMultiDocTemplate* pDstTemplate = pApp->GetDstTemplate();     
 
 ASSERT_VALID(pDstTemplate); 
 CFrameWnd* pFrame = pDstTemplate->CreateNewFrame(pDocument, pActiveChild);
  
   if (pFrame == NULL)   {  
    TRACE0("Warning: failed to create new frame.\n");   
    return FALSE;     // command failed
   }
 
   pDstTemplate->InitialUpdateFrame(pFrame, pDocument);
}
 
 

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