CTreeCtrl控件使用技巧

一、CTreeCtrl::GetRootItem

      Call this function to retrieve the root item of the tree view control.

         HTREEITEM GetRootItem( ) const;

二、CTreeCtrl::GetItemText

      

      Returns the text of the item specified by hItem.

      

        CString GetItemText(
               HTREEITEM hItem 
        ) const;

三、CTreeCtrl::GetNextItem 

      Call this function to retrieve the tree view item that has the 

specified relationship, indicated by the nCode parameter, to 

hItem. 

       HTREEITEM GetNextItem(
                HTREEITEM hItem,
                UINT nCode 
       ) const;

nCode 
A flag indicating the type of relation to hItem. This flag can be one of the following values: 
TVGN_CARET   Retrieves the currently selected item. 
TVGN_CHILD   Retrieves the first child item of the item specified by the hItem parameter. 
TVGN_DROPHILITE   Retrieves the item that is the target of a drag-and-drop operation. 
TVGN_FIRSTVISIBLE   Retrieves the first visible item. 
TVGN_LASTVISIBLE   Retrieves the last expanded item in the tree. This does not retrieve the last item visible in the tree-view window. 
TVGN_NEXT   Retrieves the next sibling item. 
TVGN_NEXTVISIBLE   Retrieves the next visible item that follows the specified item. 
TVGN_PARENT   Retrieves the parent of the specified item. 
TVGN_PREVIOUS   Retrieves the previous sibling item. 
TVGN_PREVIOUSVISIBLE   Retrieves the first visible item that precedes the specified item. 
TVGN_ROOT   Retrieves the first child item of the root item of which the specified item is a part. 

四、CTreeCtrl::ItemHasChildren 

Use this function to determine whether the tree item specified by hItem has child items. 
BOOL ItemHasChildren(
   HTREEITEM hItem 
) const;

五、CTreeCtrl::GetChildItem

Call this function to retrieve the tree view item that is the child of the item specified by hItem.

HTREEITEM GetChildItem(
   HTREEITEM hItem 
) const;