vc编程中，如何用树型结构显示磁盘路径？

char path[500];
BROWSEINFO bi;
ITEMIDLIST * pidl;
bi.hwndOwner =this->GetSafeHwnd();
bi.iImage =0;
bi.lParam =0;
bi.lpfn =0;
bi.lpszTitle ="请选择文件夹：";
bi.pidlRoot =0;
bi.pszDisplayName =0;
bi.ulFlags =BIF_RETURNONLYFSDIRS;
pidl=SHBrowseForFolder(&bi);
if (SHGetPathFromIDList(pidl,path)==TRUE)
{
MessageBox(path);
}