Checks if a file is busy or not. As Standard Additions’ “busy status” is not allways reliable, this handler checks if needed if the file is or not opened for access by other process.
OS version: OS X
Checks if you can write to a file or not (if it is opened for access by other process).
f: file path, alias, posix path
isBusy("path:to:file.txt") --> false
set f to f as Unicode text
if f does not contain ":" then set f to POSIX file f as Unicode text
if busy status of (info for alias f) then return true
--> but some times this is not good enough
open for access file f with write permission
close access result
property |version| : 1.0
property |from| : "jfileLib"
property author : "Pescados Software · PescadosWeb.com"
property |date| : date "sábado, 24 julio 2004 00:00:00"
property license : "freeware, open-source"
As I have verified, the script provided above works reliably, but only checks whether something is being written to the file by another process (that is, if the file is opened for WRITE access). For testing, I ran the song (MP3 file) in VLC.app.
For those who would like to check whether a file is opened (by some process) for READ or WRITE access, I suggest the following method. It is a little slower, but gives a guaranteed result:
-- Check if the file is used (opened for Read or Write access, t.e. busy) by other process
local thePath, command, err
set thePath to quoted form of (POSIX path of theAlias)
set command to "if ( lsof -Fp " & thePath & " | grep -q p[0-9]* ) then echo 'file is busy'; else echo 'not busy';fi"
if (do shell script command) is "file is busy" then return true
on error err
display dialog ("Error: isFileBusy " & err) giving up after 5