Wanted: A function to traverse a populated tree control

Posted on 2002-07-04
Last Modified: 2013-11-20
Any of you folks has got such a function?

It is a CTreeCtrl that is a member of my own 'CMyTree' class.

It looks like a simple cookbook thing - traversing the tree, perhaps for printing out its contents.
Question by:yossikally
  • 2
LVL 12

Expert Comment

ID: 7131181

Author Comment

ID: 7131585
I know this article, and it's not what I meant.  It shows you how to extract the path to one specific node, and I want to traverse the whole tree.

Maybe the article can be adapted to do what I want, and eventually I may do it, but I wanted to save me some work.
LVL 12

Accepted Solution

migel earned 100 total points
ID: 7131610
it isn`t so difficult to adapt this code:

Traversing an Entire Tree View's Hierarchy

This article was contributed by Vinayak Tadas.

In a tree control it often becomes necessary to display the complete path in the tree from the selected item to the root. The path can be displayed as a string comprising of the labels of the tree items and starting from the root node to the selected item or from the selected item to the root item. The following function traverses the tree and retrieves the path from the selected item to the root.

//  GetTreeHeirarchy -Retrieves the tree heirarchy as a string comprising of item
labels from root node to selected node
//  hTItem -The HTREEITEM of selected item
//  cstrTreeHierarchy  -String to store the Tree heirarchy
//  bTopToBottom -TRUE  if the path should be from root to selected item
FALSE if the path should be from the selected item to the root

void CMyTreeCtrl::GetTreeHierarchy(HTREEITEM hTItem, CString &cstrTreeHierarchy)
HTREEITEM hChildItem = GetChildItem(hTItem);
if ( hChildItem == NULL ){
cstrTreeHierarchy += GetItemText(hTItem);
cstrTreeHierarchy += "\r\n";

while (hChildItem)
    cstrTreeHierarchy += "\\";
    GetTreeHierarchy(hChildItem, cstrTreeHierarchy);
    cstrTreeHierarchy += "\r\n";   // add new line
    hChildItem = GetNextItem(hChildItem, TVGN_NEXT);
CString csTreeHeirarchy;
m_pcMyTreeCtrl->GetTreeHierarchy(m_pcMyTreeCtrl->GetRootItem(), csTreeHeirarchy);

LVL 37

Expert Comment

ID: 7137001
Maybe this can help you:

HTREEITEM CTreeCtrlEx::GetNextItemEx(HTREEITEM hItemPara)
  HTREEITEM hItem = GetChildItem(hItemPara);
  if (hItem) return hItem;

  hItem = GetNextSiblingItem(hItemPara);
  if (hItem) return hItem;

  HTREEITEM hParent = hItemPara;
  while (!hItem)
    hParent = GetParentItem(hParent);
    if (!hParent) return NULL; // We are at the root (that has no parent)
    hItem = GetNextSiblingItem(hParent);
  return hItem;

And maybe you find these ones also interesting:

// Helpers to list out selected items. (Use similar to GetFirstVisibleItem(),
// GetNextVisibleItem() and GetPrevVisibleItem()!)

HTREEITEM CTreeCtrlEx::GetFirstSelectedItem()
     for ( HTREEITEM hItem = GetRootItem(); hItem!=NULL; hItem = GetNextVisibleItem( hItem ) )
          if ( GetItemState( hItem, TVIS_SELECTED ) & TVIS_SELECTED )
               return hItem;

     return NULL;

HTREEITEM CTreeCtrlEx::GetNextSelectedItem( HTREEITEM hItem )
     for ( hItem = GetNextVisibleItem( hItem ); hItem!=NULL; hItem = GetNextVisibleItem( hItem ) )
          if ( GetItemState( hItem, TVIS_SELECTED ) & TVIS_SELECTED )
               return hItem;

     return NULL;

HTREEITEM CTreeCtrlEx::GetPrevSelectedItem( HTREEITEM hItem )
     for ( hItem = GetPrevVisibleItem( hItem ); hItem!=NULL; hItem = GetPrevVisibleItem( hItem ) )
          if ( GetItemState( hItem, TVIS_SELECTED ) & TVIS_SELECTED )
               return hItem;

     return NULL;


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