VC控件 TreeCtrl 与 ListCtrl 演示

下载源代码

这个例子类似于 Windows 的资源管理器,程序运行界面如图一所示：

图一

主要用到的类有：
CListCtrl,CTreeCtrl,CImageList,CFileFind 和函数SHGetFileInfo()

简述步骤如下：
1、增加 TreeCtrl 的 TVS_HASBUTTONS，TVS_HASLINES、TVS_LINESATROOT Style，代码如下：

DWORD dwStyle = GetWindowLong(m_tree.m_hWnd,GWL_STYLE);

dwStyle |= TVS_HASBUTTONS | TVS_HASLINES | TVS_LINESATROOT;

SetWindowLong(m_tree.m_hWnd,GWL_STYLE,dwStyle);

2、为TreeCtrl添加Root项：

m_hRoot = m_tree.InsertItem("我的电脑");

InsertItem()的函数原形为

HTREEITEM InsertItem( LPCTSTR lpszItem, HTREEITEM hParent = TVI_ROOT,

HTREEITEM hInsertAfter = TVI_LAST );

3、获取本地逻辑驱动器,并添加：

void CTreeViewDlg::GetLogicalDrives(HTREEITEM hParent)

{

    size_t szAllDriveStrings = GetLogicalDriveStrings(0,NULL);

  char *pDriveStrings = new char[szAllDriveStrings + sizeof(_T(""))];

  GetLogicalDriveStrings(szAllDriveStrings,pDriveStrings);

  size_t szDriveString = strlen(pDriveStrings);

  while(szDriveString > 0)

  {

    m_tree.InsertItem(pDriveStrings,hParent);

    pDriveStrings += szDriveString + 1;

    szDriveString = strlen(pDriveStrings);

  }

}

4、添加TVN_EXPANDED消息处理函数,当一项展开时,为其子项添加下一级目录：

void CTreeViewDlg::OnItemexpandedTree(NMHDR* pNMHDR, LRESULT* pResult)

{

  NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;

  // TODO: Add your control notification handler code here

  TVITEM item = pNMTreeView->itemNew;

  if(item.hItem == m_hRoot)

  return;

   HTREEITEM hChild = m_tree.GetChildItem(item.hItem);

  while(hChild)

  {

    AddSubDir(hChild);

    hChild = m_tree.GetNextItem(hChild,TVGN_NEXT);

  }

  *pResult = 0;

}  

AddSubDir函数功能添加子项,具体代码见示例。

5、添加TVN_SELCHANGED消息处理函数,在这个函数里,用GetFullPath()取得选中项的绝 路径(GetFullPath()具体代码看示例),在ListCtrl中添加文件而非文件夹的图标：

void CTreeViewDlg::OnSelchangedTree(NMHDR* pNMHDR, LRESULT* pResult)

{

  m_list.DeleteAllItems();

  NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;

  TVITEM item = pNMTreeView->itemNew;

  if(item.hItem == m_hRoot)

  return;

  CString str = GetFullPath(item.hItem);

   if(str.Right(1) != "//")

str += "//";

  str += "*.*";

  CFileFind file;

  BOOL bContinue = file.FindFile(str);

  while(bContinue)

  {

    bContinue = file.FindNextFile();

    if(!file.IsDirectory() && !file.IsDots())

{

SHFILEINFO info;

CString temp = str;

int index = temp.Find("*.*");

 temp.Delete(index,3);

SHGetFileInfo(temp + file.GetFileName(),

0,

&info,sizeof(&info),

SHGFI_DISPLAYNAME | SHGFI_ICON);

int i = m_ImageList.Add(info.hIcon);

m_list.InsertItem(i,info.szDisplayName,i);

}

  }

  *pResult = 0;

}