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Alias and File Specifiers
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Most commands that need a file reference as a parameter or return a file reference as a result use one of three forms. First, alias values identify files, folders, and disks that already exist. An alias value keeps track of the same file even if the file is renamed or moved to another location on the same volume. A typical alias value looks like this: alias "Macintosh HD:documents:reference.pdf"
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CHAPTER 14 WORKING WITH FILES
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Second, file references identify files and folders that may or may not already exist. They are understood by many applications and scripting additions, although they can be a bit quirky to create. A typical file reference looks like this: file "Macintosh HD:documents:reference.pdf" Finally, many applications and scripting additions also understand POSIX file values. You create a POSIX file value using a POSIX path string, and it can identify files and folders that may or may not already exist. You can create a typical POSIX file value using an object specifier like this: POSIX file "/documents/reference.pdf" However, AppleScript will display the resulting POSIX file value so it looks the same as a file reference. You can convert alias, file, and POSIX file values to HFS path strings by coercing them to a string or Unicode text. For example: alias "Macintosh HD:documents:reference.pdf" as string --> "Macintosh HD:documents:reference.pdf" You can also convert them to POSIX path strings by getting the value of their POSIX path properties: POSIX path of alias "Macintosh HD:documents:reference.pdf" --> "/documents/reference.pdf"
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Finder References
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Finder references are references to Finder items as returned after being evaluated by the Finder in one way or another. The Finder references uses an object-model look to point to files (file "file.txt" of folder "the folder" of disk "Mac HD") rather than the colon ("Mac HD:the folder:file.txt") used in HFS-style file pointers or slash-separated ones ("/folder/file.ext") used in Unix file references. Here s an example: tell application "Finder" return first file of (path to documents folder) end tell --> document file "my document.txt" of folder "Documents" of folder "hanaan" of folder "Users" of startup disk of application "Finder"
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About Filename Extensions
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In OS X, most files have Windows-style filename extensions that indicate their type, although these may often be hidden in the Finder depending on the user s preferences. AppleScript allows you to get information about a file s name, displayed name, and name extension. You can get this information with the info for command. The info for command returns a large record with plenty of information about the given file. The following four properties are connected to the name and name extension: set file_info to info for file "Macintosh HD:Applications:AppleScript:Folder Actions Setup.app:" name of file_info --> "Folder Actions Setup.app" displayed name of file_info --> "Folder Actions Setup" name extension of file_info --> "app" extension hidden of file_info --> true
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CHAPTER 14 WORKING WITH FILES
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Reading Files
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You can read files into a variable with the read command. The following script will read a chosen text file: set file_text to read (choose file of type {"TEXT"}) You can also open the file for access before reading it. Opening a file before reading it has some implications detailed earlier in this chapter.
Reading a File to a List
By default, when you read a file, you get all the text as a string. Using the using delimiter parameter, however, you can break the text into a list of items using one or more characters as delimiters. The following script reads a return-delimited file to a list, where each list item is a paragraph: set text_paragraphs to read alias "Macintosh HD:report export.txt" using delimiter {return}
Reading Specific Data
The read command has three parameters from, for, and to that allow you to specify exactly the bytes you want to read from the file: from: (An integer.) Start to read from this position and on. If omitted, start from byte 1. for: (An integer.) The number of bytes you want to read. to: (An integer.) Read up to this point. If omitted, read to the end. Two other parameters, before and until, allow you to specify a particular character it should read up to: before: (A string.) Read all characters up to, but not including, the specified character. until: (A string.) Read all characters until right after the specified character.
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