ClassWizard为CTreeCtrl(树控件)添加的NM_DBLCLK(双击)消息的响应函数中带有一个NMHDR * 型指针形参:
OnDblClkTree(NMHDR* pNMHDR, LRESULT* pResult)
这个陌生的指针类型常使初用树控件的编程者陷入迷茫之中。实际上我们完全不理会它,也可以实现树控件的双击响应,即在OnDblClkTree( )函数中调用树控件的成员函数CTreeCtrl::GetSelectedItem( )以获取树控件的子项句柄HTREEITEM,得到此句柄后,我们便可用下列成员函数获取子项各种有用信息:
CTreeCtrl::GetItemData( )、
CTreeCtrl::GetItemHeight( )、
CTreeCtrl::GetItemImage( )、
CTreeCtrl::GetItemRect( )、
CTreeCtrl::GetItemState( )、
CTreeCtrl::GetItemText( )。
例程运行结果如下图所示:
![树控件的双击响应(转) - fenghuang2008 - fh-wh-hsj......2011 树控件的双击响应(转) - fenghuang2008 - fh-wh-hsj......2011](http://www.vckbase.com/document/journal/vckbase15/images/treectrldclick.gif)
示例代码如下:
class CTreeCtrlDlg : public CDialog{…………public: HTREEITEM m_hTreeItem; CImageList m_ImgLst;// Dialog Data //{{AFX_DATA(CTreeCtrlDlg) enum { IDD = IDD_TREECTRL_DIALOG }; CTreeCtrl m_wndTree;//与对话框中树控件相关联 //}}AFX_DATA// Implementationprotected: afx_msg void OnDblClkTree(NMHDR* pNMHDR, LRESULT* pResult);…………};
void CTreeCtrlDlg::OnDblClkTree(NMHDR* pNMHDR, LRESULT* pResult) { m_hTreeItem = m_wndTree.GetSelectedItem(); //以GetItemText()函数为例: CString S1 = m_wndTree.GetItemText(m_hTreeItem); AfxMessageBox("You have selected "+S1); *pResult = 0; }