树节点的遍历

BOOL CFileView::CheckNode(CString strNode, HTREEITEM hItem)
{
 HTREEITEM childItem = m_FileTree.GetChildItem(hItem);
 while(childItem!=NULL)
 {
  CString strTemp = m_FileTree.GetItemText(childItem);
  if(strNode == strTemp)
  {
   MessageBox(_T("This file is already in the file list！"));
   return TRUE;
  }
  childItem = m_FileTree.GetNextItem(childItem, TVGN_NEXT );
 }
 return FALSE;
}