自动遍历文件夹生成成目录树
..........................\FileTree.clw
..........................\FileTree.cpp
..........................\FileTree.dsp
..........................\FileTree.dsw
..........................\FileTree.h
..........................\FileTree.rc
..........................\FileTreeDlg.cpp
..........................\FileTreeDlg.h
..........................\res

..........................\...\FileTree.rc2
..........................\...\kebiao.ico
..........................\Resource.h
..........................\StdAfx.cpp
..........................\StdAfx.h
..........................\成绩表
..........................\......\C语言
..........................\......\.....\计算机01－1.txt
..........................\......\.....\计算机01－2.txt
..........................\......\.....\计算机01－3.txt
..........................\......\VC程序设计
..........................\......\..........\信息
..........................\......\..........\计算机
..........................\......\..........\......\计算机01－1.txt
..........................\......\..........\......\计算机01－2.txt
..........................\......\..........\......\计算机01－3.txt
..........................\......\..........\......\计算机01－4.txt
..........................\......\..........\......\计算机01－5.txt
..........................\......\..........\......\计算机01－6.txt
..........................\......\数学
..........................\......\....\计算机01－1.txt
..........................\......\....\计算机01－2.txt
..........................\......\....\计算机01－3.txt
..........................\......\英语
..........................\......\....\计算机01－1.txt
..........................\......\....\计算机01－2.txt
..........................\......\....\计算机01－3.txt
..........................\......\计算机基础
..........................\......\..........\计算机01－1.txt
..........................\......\..........\计算机01－2.txt
..........................\......\..........\计算机01－3.txt