CDirTreeCtrl for displaying or selecting Folders and Files

Environment: Visual C++ 6.0 SP3

This DirTreeCtrl allows a user to display folders and Filenames(optional).
The control uses the system image list for displaying the icons for the items in
the DirTreeCtrl.

You must not manage the Icon-Resources int the ImageList. The items sorted first by
foldernames and then (if selected) by filenames.

  • You can obtain the the full PathName of an Item.
  • You can set a start path before displaying the TreeItems.
  • You can select a subpath.
  • How to use this control:

    Use it in a Dialog:

    To use the control in a Dialog do the following steps:

  • Create a CTreeCtrl in your Dialog resource.

  • Define a member variable for the CDirTreeCtrl in the Dialog header file.
  • CDirTreeCtrl m_DirTree;
    

    Insert the Following Code in your OnInitDialog function:

    BOOL CTreeDialog::OnInitDialog() 
    {
     CDialog::OnInitDialog();
     TCHAR  szWorkDir[MAX_PATH];
        
     // TODO: Add extra initialization here
     // Here we subclass our CDirTreeCtrl
     if ( !m_TreeCtrl.m_hWnd )
     {
      if ( m_TreeCtrl.SubclassDlgItem( IDC_TREE1, this ) )
      {           
       m_TreeCtrl.DisplayTree( NULL /*Display all*/, 
                               TRUE /* TRUE = Display Files*/ );
    
       _getcwd( szWorkDir, 256 );
       // set the Path to the current Work-Directory
       m_TreeCtrl.SetSelPath( szWorkDir );
      }
     }
        
     return TRUE; // return TRUE unless you set the focus to a control
     // EXCEPTION: OCX Property Pages should return FALSE
    }
    

    Using the CDirTreeCtrl in a CView

    To use this control in a CView class do the following steps:
    • Define a CTreeCtrl member in your CView header file.
    • Define a ID_TREECTRL identifier in your CView header file.
    • In the class wizard implement the create function for the CView class.
    • Modify the CView::Create function listed below
    • In the class wizard implement the WM_SIZE function.
    • Modify the CView::OnSize function listed below.
    BOOL CLeftView::Create(LPCTSTR lpszClassName, 
                           LPCTSTR lpszWindowName, 
                           DWORD dwStyle, 
                           const RECT& rect, 
                           CWnd* pParentWnd, 
                           UINT nID, 
                           CCreateContext* pContext) 
    {
     // TODO: Add your specialized code here and/or call the base class
        
     BOOL  bRet;
    
     bRet = CWnd::Create(lpszClassName, 
                         lpszWindowName, 
                         dwStyle, 
                         rect, 
                         pParentWnd, 
                         nID, 
                         pContext);
    
     // this part creates the TreeCtrl and use the CLeftView
     // as his parent Window
        
     if ( m_DirTree.m_hWnd == NULL && bRet )
     {
      bRet = m_DirTree.Create(WS_CHILD | TVS_LINESATROOT | 
                              TVS_HASBUTTONS | WS_VISIBLE | 
                              TVS_HASLINES, 
                              CRect(0, 0, 0, 0), 
                              this
                              ID_TREECTRL );
      if ( bRet )
       m_DirTree.DisplayTree( NULL, TRUE );
     }
    
     return bRet;
    }
    
    void CLeftView::OnSize(UINT nType, int cx, int cy) 
    {
     CView::OnSize(nType, cx, cy);
    
     // TODO: Add your message handler code here
     if ( m_DirTree.m_hWnd )
      m_DirTree.SetWindowPos( NULL, 0, 0, cx, cy, SWP_NOZORDER | SWP_NOMOVE );
    }
    

    Downloads

    Download demo project - 55 Kb
    Download source - 5 Kb


    Comments

    • network

      Posted by overseb on 09/04/2006 11:52am

      Is it possible to see the directories which are on a network ? How to do this ? thx

      Reply
    • Comment

      Posted by redhat on 09/14/2005 07:25am

      Hi Michael!  I find your article very useful especially on my search using tree view control.  Could you provide me some help on tree view control displaying or selecting data from a database?  Thank you.

      Reply
    • The code do not work to me, why?

      Posted by twisterh on 07/12/2005 11:53pm

      I downloaded the entire project and rebuilt it. Got nothing both CView as well as Dialog box as I executed it. I did it with XP and VC++ 6.0. Can anyone help me out?

      Reply
    • Forward slashes killing your root

      Posted by Legacy on 10/08/2003 12:00am

      Originally posted by: LuckY

      When calling DisplayTree() with a path as the first
      
      argument, if there are any forward slashes (/) instead of
      backslashes (\) the tree will be dead. It took me a while
      to figure out that this was my problem. So I just added
      the line below to replace forwards with backslashes. The
      problem, if you're curious is that the tree showed only
      the subdirectories of the path I was passing and I couldn't
      expand them.

      In the DisplayTree() function, insert the indicated line:
      {
      m_strRoot = strRoot;

      m_strRoot.Replace('/', '\\');// <-- ADD THIS LINE

      if ( m_strRoot.Right(1) != '\\' )
      m_strRoot += "\\";
      HTREEITEM hParent = AddItem( TVI_ROOT, m_strRoot );
      DisplayPath( hParent, strRoot );
      }

      Reply
    • Auto-scroll to show newly expanded root subtree

      Posted by Legacy on 10/08/2003 12:00am

      Originally posted by: LuckY

      One thing that was bugging me was when I expanded the network drive at the bottom of the tree, the subtree expanded out below the bottom of the window but the view didn't change. I added the two lines in the code below to scroll the expanding root item to the top of the window.
      
      

      void CDirTreeCtrl::OnItemexpanded(NMHDR* pNMHDR, LRESULT* pResult)
      {
      NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
      CString strPath;

      if ( pNMTreeView->itemNew.state & TVIS_EXPANDED )
      {
      //UINT uTest = TVIS_EXPANDEDONCE;
      ExpandItem( pNMTreeView->itemNew.hItem, TVE_EXPAND );

      // ADD these two lines
      if (GetParentItem(pNMTreeView->itemNew.hItem) == NULL)// scroll to show the
      Select(pNMTreeView->itemNew.hItem, TVGN_FIRSTVISIBLE);// newly expanded items

      // ...

      Reply
    • In Commerical Product

      Posted by Legacy on 09/27/2003 12:00am

      Originally posted by: Robert

      Can this code be freely used in a product?

      Only the core components of course, not the demo.

      ~Robert

      Reply
    • Problem: I can't subclass with just one dialog...

      Posted by Legacy on 12/15/2002 12:00am

      Originally posted by: julio

      I have tried to use this class without using the document/view framework, just using a Dialog as a main window. 
      
      I think it happens a problem in the line:

      if ( !m_TreeCtrl.m_hWnd )
      it always return false. How get I get the handle in order to subclass? is it possible

      Thanks,

      J. Gomes

      Reply
    • Can I use this code on my product?

      Posted by Legacy on 11/11/2002 12:00am

      Originally posted by: magda wurzl

      Hi,

      Is it possible to use this code on my product?

      Is there a copyright that I should include on the source code?

      Thank you,
      magda.

      Reply
    • THANKS

      Posted by Legacy on 09/19/2002 12:00am

      Originally posted by: amartin

      Great

      Reply
    • Thanks, it's a very good code.

      Posted by Legacy on 07/22/2002 12:00am

      Originally posted by: Dennis L.

      Thanks, it's a very good code.
      It helped me in my developing and I added a drag&drop methods.
      I think it can be really usefull for beginner programmer cause it has a large functionality.

      Reply
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