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CHAPTER 3: File System Access Using File and Folder objects 42

a folder C:\C on Windows. A path starting with /c always addresses the drive C:, so in this case, to access

the folder by name, you must use both the drive name and the folder name, for example

/c/c for C:\C.

If the current drive contains a root folder with the same name as another drive letter, that name is

considered to be a folder. That is, if there is a folder

D:\C, and if the current drive is D:, the URI path

/c/temp/file translates to the Windows path D:\c\temp\file. In this case, to access drive C, you would

have to use the Windows path name conventions.

To access a remote volume, use a uniform naming convention (UNC) path name of the form

//servername/sharename. These path names are portable, because both Max OS X and UNIX ignore

multiple slash characters. Note that on Windows, UNC names do not work for local volumes.

These examples assume that the current drive is

Aliases

When you access an alias, the operation is transparently forwarded to the real file. The only operations that

affect the alias are calls to

rename and remove, and setting properties readonly and hidden. When a File

object represents an alias, the

alias property of the object returns true, and the resolve method returns

the

File or Folder object for the target of the alias.

On Windows, all file system aliases (called shortcuts) are actual files whose names end with the extension

.lnk. Never use this extension directly; the File and Folder objects work without it.

For example, suppose there is a shortcut to the file

/folder1/some.txt in the folder /folder2. The full

Windows file name of the shortcut file is

\folder2\some.txt.lnk.

To access the shortcut from a

File object, specify the path /folder2/some.txt. Calling that File object’s

open method opens the linked file (in /folder1). Calling the File object’s rename method renames the

shortcut file itself (leaving the

.lnk extension intact).

However, Windows permits a file and its shortcut to reside in the same folder. In this case, the

File object

always accesses the original file. You cannot create a

File object to access the shortcut when it is in the

same folder as its linked file.

A script can create a file alias by creating a

File object for a file that does not yet exist on disk, and using its

createAlias method to specify the target of the alias.

Portability issues

If your application will run on multiple platforms, use relative path names, or try to originate path names

from the home directory. If that is not possible, work with Mac OS X and UNIX aliases, and store your files

on a machine that is remote to your Windows machine so that you can use UNC names.

URI path name Windows path name

/c/dir/file c:\dir\file

/remote/dir/file D:\remote\dir\file

/root/dir/file D:\root\dir\file

~/dir/file C:\Documents and Settings\jdoe\dir\file

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