扫描子文件夹的示例，对某些文件夹操作，查找等特别有用。看似简单但不知道，对有些操作就会特头痛。 //复杂的程序都是由不起眼的东东拼凑起来的-scan subfolders example, the right to operate certain folder, find out as particularly useful. Seemingly simple, but I do not know, for some special operation will be a headache. /