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Q111814: HOWTO: Get the Current Document in an MDI Application

Article: Q111814
Product(s): Microsoft C Compiler
Version(s): winnt:1.0,2.0,2.1,4.0
Operating System(s): 
Keyword(s): kbDocView kbMFC kbVC kbDSupport kbGrpDSMFCATL
Last Modified: 07-MAY-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++ for Windows, 16-bit edition, versions 1.0, 1.5, 1.52 
   - Microsoft Visual C++, 32-bit Editions, versions 1.0, 2.0, 2.1, 4.0 
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SUMMARY
=======

To get a pointer to the currently active document from an MDI application, use
the CMDIFrameWnd::MDIGetActive() function. MDIGetActive() returns a pointer to
the active CMDIChildWnd. This CMDIChildWnd * enables you to get a valid pointer
to the currently active document via GetActiveDocument().

See the online help and "Class Libraries Reference" for more information about
these functions.

MORE INFORMATION
================

The sample below shows how to get a valid pointer to the currently active
document anywhere within an MDI application.

Sample Code
-----------

     /* Compile options needed:
     */ 
     void Some_Function()
     {
       CMyDoc   *pActiveDoc;      // CMyDoc derived from CDocument
       CMyFrame *pActiveFrame;    // CMyFrame derived from CMDIChildWnd
       pActiveFrame =(CMyFrame*)
                 ((CMainFrame*)(AfxGetApp()-<m_pMainWnd))-<MDIGetActive();
      // MFC 2.5 and later versions contain AfxGetMainWnd(), which
      // can be used to gain access to the main window instead of
      // "AfxGetApp()->m_pMainWnd
       pActiveDoc = (CMyDoc*)pActiveFrame->GetActiveDocument();
     }

Additional query words: MFC CDocument kbSweptVC600

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Keywords          : kbDocView kbMFC kbVC kbDSupport kbGrpDSMFCATL 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:1.0,2.0,2.1,4.0
Issue type        : kbhowto

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