判断字符串是否是有效的UNC路径.
(dos_ispathunc path)
path
等判断的路径.
T 如果路径是UNC路径.
nil 如果不是或失败时.
Command: (dos_ispathunc "C:\\Program Files\\AutoCAD 2006\\")
nil
Command: (dos_ispathroot "\\\\Server\\Shared Folder")
T