How To Get the Current Document in an MDI Application

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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();
   }