How to create a CMultiDocTemplate based window in Visual C++

MORE INFORMATION

1. Add a CMultiDocTemplate pointer to your CWinApp derived class:

         class CMyApp : public CWinApp
         {
           ...
   
          public:
           CMultiDocTemplate* m_pDocTemplate;
   
           ...
   
         }
   						

   NOTE: If you plan to use multiple document types, you must create a CMultiDocTemplate pointer member variable for each document type.
2. In the call to CWinApp::InitInstance, remove the creation of the CMultiDocTemplate from the call to AddDocTemplate. Set the pointer to point to the new CMultiDocTemplate. Use the pointer to call AddDocTemplate:

         BOOL CMyApp::InitInstance()
         {
           ...
   
           m_pDocTemplate = new CMultiDocTemplate(IDR_TEXTTYPE,
                                         RUNTIME_CLASS(CMyDoc),
                                         RUNTIME_CLASS(CMDIChildWnd),
                                         RUNTIME_CLASS(CMyView));
   
           AddDocTemplate(m_pDocTemplate);
   
           ...
   
         }
   						

3. Use the pointer to call CMultiDocTemplate::OpenDocumentFile with a NULL parameter to create the new window. For this example, assume there is a button in a CView window. In the BN_CLICKED handler for the button, we want to create a window based on m_pDocTemplate:

         void CMyView::OnNewWindowButtonClicked()
         {
             CMyApp* pApp = (CMyApp*)AfxGetApp();
             pApp->m_pDocTemplate->OpenDocumentFile(NULL);
         }
   						

   This same technique could be used to create a CSingleDocTemplate based window in a Single Document Interface (SDI) application. However, it is not necessary. Because there is only one document template for the application, calling OnFileNew() will create the new window without prompting the user for the type of document.