AppleScript - System Events Error : Access for assistive devices is disabled

applescript, macos

Solution

The problem is not the assistive devices. AppleScript seems to incorrectly return that error code when it tries to access windows of a process that can never have any windows (in my case it was "Google Chrome Helper").

You need to catch the errors. This works for me:

tell application "System Events"
    set procs to processes
    set windowPositions to {}
    repeat with proc in procs
        try
            if exists (window 1 of proc) then
                repeat with w in windows of proc
                    copy w's position to the end of windowPositions
                end repeat
            end if
        end try -- ignore errors
    end repeat
end tell
return windowPositions

returning a list of coordinate pairs, such as {{1067, 22}, {31, 466}, {27, 56}, {63, 22}, {987, 22}} – is that what you were trying to get?

Problem

I have a problem with AppleScript and System Events. I have check "Enable access for assistive devices" in the “Universal Access” preference pane in System Preferences. When I try : arch -i386 osascript -e 'tell application "System Events" to get the position of every window of every process' I have this error : System Events got an error: Access for assistive devices is disabled. (-25211) Do you have any idea ? Thanks a lot

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