Using ATL to Automate an MFC Application

  1. Lets start first to make the application visible. Add a property 'Visible' as a VARIANT_BOOL. The code should look like this:
    //-----------------------------------------------
    // get & put_Visible
    //-----------------------------------------------
    //
    STDMETHODIMP
    CAutoATLApp::get_Visible(VARIANT_BOOL *pVal)
    {
     METHOD_PROLOGUE_ATL
    
     CWnd* pMainWnd = AfxGetMainWnd();
     ASSERT(pMainWnd);
     *pVal = pMainWnd->IsWindowVisible();
    
     return S_OK;
    }
    
    STDMETHODIMP
    CAutoATLApp::put_Visible(VARIANT_BOOL newVal)
    {
     METHOD_PROLOGUE_ATL
    
     CWnd* pMainWnd = AfxGetMainWnd();
     ASSERT(pMainWnd);
     pMainWnd->ShowWindow(SW_SHOW);
     pMainWnd->UpdateWindow();
    
     return S_OK;
    }
    
  2. When i document i created by a client no frame or views are created. To be able to do so we must override CreateNewDocument in CMultiDocTemplate. CreateNewDocument is called from OpenDocumentFile to create a new document. But the document already exists. CrateNewDocument should therefor be altered NOT to create a document. Create a new class that inherites from CMultiDocTemplate and override CreateNewDocument and add a member variable CDocument* m_pDocument. CreateNewDocument should look like this:
    CDocument*
    CAnotherMultiDocTemplate::CreateNewDocument()
    {
     // default implementation constructs one from CRuntimeClass
     if (m_pDocClass == NULL)
     {
      TRACE0("Error: you must override "
             "CDocTemplate::CreateNewDocument.\n");
      ASSERT(FALSE);
      return NULL;
     }
    
    //-----------------------------------------------
    //	BdL; Document has already been created!
    //
    //	CDocument* pDocument = 
    //	   (CDocument*)m_pDocClass->CreateObject();
    //-----------------------------------------------
     if (m_pDocument == NULL)
     {
      TRACE1("Warning: Dynamic create of document "
             "type %hs failed.\n",
      m_pDocClass->m_lpszClassName);
      return NULL;
     }
    
     ASSERT_KINDOF(CDocument, m_pDocument);
     AddDocument(m_pDocument);
     return m_pDocument;
    }
    

    To make your life a bit more easy, add the header file (AnotherMultiDocTemplate.h) of the new class to stdafx.h

  3. Alter in InitInstance of the application the DocumentTemplate:
    // CMultiDocTemplate* pDocTemplate;		
    // pDocTemplate = new CMultiDocTemplate(
    to
    CAnotherMultiDocTemplate* pDocTemplate;
    pDocTemplate = new CAnotherMultiDocTemplate(
    
  4. Add FinalConstruct and FinalRelease to CAutoATLDoc. FinalConstruct will continue to create Frame and View. FinalRelease will the necessary cleanup.

    Add the following lines to CAutoAtlDoc.h

    HRESULT	FinalConstruct();
    void	FinalRelease();
    

    Add the following lines to CAutoAtlDoc.cpp

    HRESULT
    CAutoATLDoc::FinalConstruct()
    {
     METHOD_PROLOGUE_ATL
    
     CAutoATLApp* pApp = (CAutoATLApp*)AfxGetApp();
     ASSERT_VALID(pApp);
    
     // Find document template
     POSITION pos = pApp->GetFirstDocTemplatePosition();
     CAnotherMultiDocTemplate* pDocClass = 
      (CAnotherMultiDocTemplate*)pApp->GetNextDocTemplate(pos);
    
     ASSERT_VALID(pDocClass);
    
     // Create view and frame
     pDocClass->m_pDocument = this;
     pDocClass->OpenDocumentFile(NULL, true);
    
     return S_OK;
    }
    
    void
    CAutoATLDoc::FinalRelease()
    {
     // Do will still have a View connected?
     // (The frame will no longer exist if the document
     // has been closed manually, because the OnClose
     // message is passed BEFORE deleting the document)
     POSITION pos = GetFirstViewPosition();
     if (pos != NULL) {
      // Prevent the document from deleting itself already.
      m_bAutoDelete = false;
      OnCloseDocument();
      m_bAutoDelete = true;
     }
    }
    
  5. In the application override OnFileOpen, OnFileNew and OpenDocumentFile. Normally OnFileOpen and OnFileNew create a document AND the frame and view. Now the frame and view are now created in the FinalConstruct of CAutoAtlDoc.
    //-----------------------------------------------
    // 
    //-----------------------------------------------
    //
    void
    CAutoATLApp::OnFileNew() 
    {
     // Dynamically create a new CFuchiaDocument.
     // The document will continue to create itself
     // in the constructor.
     IMPLEMENT_CREATE_DOCUMENT;
    }
    
    void
    CAutoATLApp::OnFileOpen() 
    {
     // prompt the user (with all document templates)
     CString _lpszPathName;
     if (!DoPromptFileName(_lpszPathName, 
                           AFX_IDS_OPENFILE,
                           OFN_HIDEREADONLY | OFN_FILEMUSTEXIST,
                           TRUE, NULL))
      return; // open cancelled
    
     OpenDocumentFile(_lpszPathName);
    }
    
    CDocument*
    CAutoATLApp::OpenDocumentFile(LPCTSTR lpszFileName) 
    {
     // Dynamically create a new CFuchiaDocument.
     // The document will continue to create itself
     // in the constructor.
     IMPLEMENT_CREATE_DOCUMENT;
    
     // Open an existing document
     CWaitCursor wait;
     if ( !pDoc->OnOpenDocument( lpszFileName ) )
     {
      // Unable to open the document.
      TRACE( "Unable to open the document \
      in %s at %d.\n", THIS_FILE, __LINE__ );
      // We must delete the document instance.
      pDoc->Release();
      return NULL;
     }
    
     // Set the document file path and name.
     pDoc->SetPathName(lpszFileName);
     return pDoc;
    }
    
  6. IMPLEMENT_CREATE_DOCUMENT is a macro you can put on top in the document header file.
    //-----------------------------------------------
    // Call this MACRO when you need to create a new Document.
    // The document will construct itself further inside
    // FinalConstruct.
    #define IMPLEMENT_CREATE_DOCUMENT \
     CComObject* pDoc; \
     HRESULT hr = CComObject::CreateInstance(&pDoc); \
     ASSERT(SUCCEEDED(hr)); \
     pDoc->InternalAddRef();
    //-----------------------------------------------
    

Downloads

Download demo project - 44 Kb


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