用对话框浏览显示目录的树型结构

本程序引入CShellTree、CFileName、CFilePidl等类，用于实现在对话框中显示外壳命名空间，参见下图。

CShellTree派生于CTreeCtrl，其函数包括：

// Initializes the treeview with "mycomputer" etc void PopulateTree(); // Initializes the treeview starting with a special folder as root // See the SHGetSpecialFolderLocation() for constants and descriptions void PopulateTree(int SpecialFolderID); // Must be called from OnItemExpanding(), message TVN_ITEMEXPANDING void OnFolderExpanding(NMHDR* pNMHDR, LRESULT* pResult); // Frees memory allocated for the shell object. message TVN_DELETEITEM void OnDeleteShellItem(NMHDR* pNMHDR, LRESULT* pResult); // Must be called from OnRclick(). message NM_RCLICK void GetContextMenu(NMHDR* pNMHDR, LRESULT* pResult); // Must be called from OnSelChanged(), message TVN_SELCHANGED BOOL OnFolderSelected(NMHDR* pNMHDR, LRESULT* pResult, CString &szFolderPath); // Enables Folder Images in the tree control. void EnableImages(); // Retrieves the path of the Selected Folder. BOOL GetSelectedFolderPath(CString &szFolderPath); // Opens the folder of the specified path. Does it's own error checking void TunnelTree(CString szFindPath)

使用上述类的方法如下：

1. 在工程中包含shelltree.cpp和shelltree.h, shellpidl.cpp和shellpidl.h，filename.cpp和 filename.h

   #include "Shelltree.h" #include "shellpidl.h" #include "filename.h"

2. 创建对话框。

3. 在对话框中添加ShellTree类成员：

   CShellTree* m_TreeCtl;

4. 在OnInitDialog()中，初始化树视控件：

   BOOL CTreeSelect::OnInitDialog() { CDialog::OnInitDialog(); // TODO: Add extra initialization here m_TreeCtl = (CShellTree*) GetDlgItem(IDC_SHELLTREE); //replace IDC_SHELLTREE with your control's ID ASSERT(m_TreeCtl); m_TreeCtl->EnableImages(); //enable images m_TreeCtl->PopulateTree(); //populate for the with Shell Folders for the first time return TRUE; // return TRUE unless you set the focus to a control // EXCEPTION: OCX Property Pages should return FALSE }

   注意：CShellTree具备处理图像的能力，不用包含ImageList到CShellTree。

   调用

   m_TreeCtl->EnableImages();

   创建和附加图像列表到树视控件，下面代码初始化树视控件：

   m_TreeCtl->PopulateTree();

5. 必须创建回调TVN_ITEMEXPANDING的处理函数，否则，树视将会死掉。

   void CTreeSelect::OnItemexpanding(NMHDR* pNMHDR, LRESULT* pResult) { NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR; // TODO: Add your control notification handler code here m_TreeCtl->FolderExpanding(pNMHDR,pResult); *pResult = 0; }

   FolderExpanding()方法添加目录节点到树视控件中，其与OnItemExpanding具有相同的参数。

6. 如果需要弹出菜单激活，创建OnRclick()，其弹出与Windows Explorer一样：

   void CTreeSelect::OnRclick(NMHDR* pNMHDR, LRESULT* pResult) { // TODO: Add your control notification handler code here m_TreeCtl->FolderPopup(pNMHDR,pResult); *pResult = 0; }

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