这个例子类似于 Windows 的资源管理器,程序运行界面如下图一所示:
主要用到的类有:
(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/bianchengyuyan/)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;
} 这只是一个简单的例子,你可以在 ListCtrl 中添加鼠标双击消息的处理函数,用 Process 打开该选中的文件; 该示例在VC6,xp下编译通过。
图一