树形控件(Tree Control)

///"添加"按钮的响应函数
void CTreeCtrlDemoDlg::OnBtnAdd() 
{
	// TODO: Add your control notification handler code here
	///获取用户的输入
	CString strText;
	GetDlgItemText(IDC_EDT_TEXT, strText);
	if(strText.GetLength() == 0)
	{
		AfxMessageBox(_T("请输入文本!"));
		return ;
	}
	///获取当前所选结点
	HTREEITEM hItem = m_tree.GetSelectedItem();
	///如果当前没有选中节点，则添加根节点
	if(hItem== NULL)
	{
		hItem = TVI_ROOT;
	}

	///节点数据
	TVINSERTSTRUCT ts = {0};
	//新节点的父节点
	ts.hParent = hItem;
	///新节点添加在同级节点最后
	ts.hInsertAfter = TVI_LAST;
	///新节点的文本
	ts.item.pszText = (LPTSTR)(LPCTSTR)strText;
	///让文本成员有效
	ts.item.mask = TVIF_TEXT;
	///添加新节点
	HTREEITEM hNewItem = m_tree.InsertItem(&ts);

	///选中新节点
   	m_tree.SelectItem(hNewItem);
	///确保新节点在可视范围内
	m_tree.EnsureVisible(hNewItem);
}

///"删除"按钮的响应函数

void CTreeCtrlDemoDlg::OnBtnDelete() 
{
	// TODO: Add your control notification handler code here
	///获取当前所选结点
	HTREEITEM hItem = m_tree.GetSelectedItem();

	if(hItem ==NULL)
	{
		AfxMessageBox(_T("请选择一个结点!"));
		return ;
	}

	//取得当前结点的父节点
	HTREEITEM hParent = m_tree.GetParentItem(hItem);
	///删除结点
	m_tree.DeleteItem(hItem);
	///选中其父节点
	m_tree.SelectItem(hParent);
}

///"修改"按钮的消息响应函数

void CTreeCtrlDemoDlg::OnBtnEdit() 
{
	// TODO: Add your control notification handler code here
	///获取当前选中的结点
	HTREEITEM hItem = m_tree.GetSelectedItem();
	if(hItem == NULL)
	{
		AfxMessageBox(_T("请选择一个节点!"));
		return ; 
	}
	///获取用户的输入
	CString strText;
	GetDlgItemText(IDC_EDT_TEXT , strText);
	if(strText.GetLength() == 0)
	{
		AfxMessageBox(_T("请输入文本!"));
		return ;
	}
	///修改结点文本
	m_tree.SetItemText(hItem,strText);
}

///树形控件“TVN_SELCHANGEED”通知消息的响应函数
///控件当前结点改变时的消息处理

void CTreeCtrlDemoDlg::OnSelchangedTree(NMHDR* pNMHDR, LRESULT* pResult) 
{
	NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
	// TODO: Add your control notification handler code here
	///获取当前所选结点
	HTREEITEM hItem = m_tree.GetSelectedItem();
	if(hItem != NULL)
	{
		///获取结点文本
		CString strText= m_tree.GetItemText(hItem);
		///将结点文本显示在文本框中
		SetDlgItemText(IDC_EDT_TEXT , strText);
	}
	*pResult = 0;
}

界面解释：

树形控件ID为IDC_TREE，关联变量m_tree ,选中style:has buttons 、has lines 、lines at root 、show selection always；

按钮ID为IDC_BTN_ADD、IDC_BTN_EDIT、 IDC_BTN_DELETE

文本框ID为IDC_EDT_TEXT