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Generating QR in Objective-C WORKING WITH FILES

CHAPTER 14 WORKING WITH FILES
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the value assigned to the variable file_ref will be a reference that looks like this: file "Macintosh HD:Some file.pdf" of script Later, you can use this reference value in application and scripting addition commands without any problem: tell application "TextEdit" open file_ref end tell read file_ref
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POSIX File Values
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The POSIX file value class is a slightly more recent addition, first appearing in AppleScript on Mac OS 9.2.2 and OS X 10.1.2. Together, the POSIX file value class and the POSIX path property found in all file specifier values enable AppleScripts to work with the Unix-style POSIX paths used in many parts of OS X, as well as the traditional HFS-style paths inherited from the original Mac OS. Unlike aliases, POSIX file values can refer to any location in the file system, even nonexistent files in nonexistent folders on nonexistent disks. For example, the choose file name command in Standard Additions will return a POSIX file value identifying a file that may or may not exist yet.
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Creating POSIX File Values
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To create a POSIX file value, you write POSIX file followed by a POSIX path string. For example: POSIX file "/Applications/Chess.app" The POSIX path string must provide an absolute path name, that is, one that begins at the file system s root (/) and that describes the full path to the desired file, folder, or disk. (If you re familiar with Unix, you ll know that the Unix command line also understands the concept of relative path names; AppleScript isn t this clever unfortunately.) One strange thing you ll notice when you compile a POSIX file literal such as this: POSIX file "/Applications/Chess.app" is that the AppleScript compiler will helpfully rewrite it as this: file "Macintosh HD:Applications:Chess.app" This can be quite annoying if you need to recompile the script again later, because AppleScript will treat the file "..." code differently. (See the previous section for more information.) However, you can always prevent AppleScript from rearranging your code by writing it in a slightly different way: POSIX file (get "/Applications/Chess.app") You can also supply the POSIX path string via a variable or other expression: set path_string to "/Applications/Chess.app" set posix_file to POSIX file path_string The resulting value will appear in Script Editor s Result area as follows: file "Macintosh HD:Applications:Chess.app"
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CHAPTER 14 WORKING WITH FILES
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Should you need to, you can find out whether this value is of the POSIX file class by getting the value of its class property: class of posix_file --> class furl I have no idea either why the class name is class furl instead of POSIX file as you d expect, but it works OK, so this isn t a problem.
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Converting POSIX Files to Other Values
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Most of the time you don t need to worry about the difference between a POSIX file and other file values because modern OS X applications and scripting additions should accept both. If you do have to deal with difficult older applications that won t accept POSIX file values for some reason, you can always coerce them to one of AppleScript s other classes (assuming the new class can represent the same item, of course). For example: POSIX file (get "/Applications/Chess.app") as alias --> alias "Macintosh HD:Applications:Chess.app:" You can also obtain an HFS path string by coercing the POSIX file value to a string: POSIX file (get "/Applications/Chess.app") as string --> "Macintosh HD:Applications:Chess.app:" Finally, you can convert a POSIX file value to a POSIX path string by asking it for the value of its POSIX path property: set posix_file to POSIX file (get "/Applications/Chess.app") POSIX path of posix_file --> "/Users/hanaan/ReadMe.txt" You can convert paths in the opposite direction, from HFS to POSIX, using the posix path property of a file object, like this: set posix_path to POSIX path of (alias hfs_path) Although this method is the safest, it ll work only when converting references to files that actually exist, which is no good if you need to refer to files that are not yet there. In that case, use this: set posix_path to POSIX path of hfs_path The previous example won t work correctly for paths that start with a volume that isn t mounted. For instance, the POSIX path "Server:Folder:File" will become "/Server/Folder/File" instead of "/Volumes/Server/Folder/File". The following subroutine will reliably convert HFS paths of existing and nonexisting files into POSIX paths by evaluating each character and converting it if needed: set hfs_path to "Backup CD:3/19/2006:Client Files:Catalog.indd" set posix_path to convert_hfs_to_posix_path(hfs_path) --> "/Volumes/Backup CD/3:19:2006/Client Files/Catalog.indd" on convert_hfs_to_posix_path(hfs_path) set posix_path to "/Volumes/" repeat with char_ref in hfs_path if contents of char_ref = ":" then set posix_path to posix_path & "/" else if contents of char_ref = "/" then set posix_path to posix_path & ":" else
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