Applescript: how to click on checkbox only if is not already selected? - applescript

Question

I want to enable option "Open in Low Resolution" for all ".app" files in the system.
This is my Applescript code:
on run argv
tell application "Finder"
set myFile to (POSIX file (item 1 of argv)) as alias
open information window of myFile
activate
tell application "System Events"
try
click checkbox "Open in Low Resolution" of scroll area 1 of (windows where name contains "Info") of process "Finder"
end try
end tell
close information window of myFile
end tell
end run
i run it with:
sudo find / -name *.app -type d -exec osascript myScript.scpt "{}" \;
This work very good: it looks for all ".app" files, pass the file to the script, the script will open the "information window" of the file, clicks the "Open in Low Resolution" checkbox and finally it closes the window.
Problem: i need to click on the Checkbox ONLY if is not already selected.
I tried with this solution (and other similar):
Tick a checkbox only if it's not selected
Nothing happens. No errors.
System Events, Applescripts ecc... are allowed to run on Security And Privacy Settings
This does not works:
on run argv
tell application "Finder"
--set myFile to (POSIX file (item 1 of argv)) as alias
set myFile to (POSIX file ("/Applications/App Store.app")) as alias
open information window of myFile
activate
end tell
tell application "System Events" to tell process "Finder"
try
set theCheckbox to checkbox "Open in Low Resolution" of scroll area 1 of (windows where name contains "Info") of process "Finder"
tell theCheckbox
set checkboxStatus to value of theCheckbox as boolean
if checkboxStatus is false then click theCheckbox
end tell
end try
end tell
tell application "Finder"
delay 1
close information window of myFile
end tell
end run
It simply does nothing.
The following sample (with an app Info Window opened):
tell application "System Events" to tell process "Finder"
set theCheckbox to checkbox "Open in Low Resolution" of scroll area 1 of (windows where name contains "Info")
tell theCheckbox
if not (its value as boolean) then click theCheckbox
end tell
end tell
Will produce the following error:
Can’t make «class valL» of {«class chbx» "Open in Low Resolution" of
«class scra» 1 of window "App Store.app Info" of «class pcap» "Finder"
of application "System Events"} into type boolean
What can i do next?
Best regards.

Answer 1

I suspect the problem is that you've put everything inside a Finder tell block. The Finder is notoriously finicky about scripting; best to use it as little as possible.
Rearranging things to use System Events seems to fix the problem (though admittedly my old MacBook Pro doesn't have a retina screen, so I had to test this using a different checkbox). Notice that you don't need to activate the Finder or the information window; you can do this all in the background.
on run argv
set myAppPath to item 1 of argv -- should be a POSIX path
tell application "Finder"
open information window of file (POSIX file myAppPath as text)
end tell
tell application "System Events"
set appName to displayed name of disk item myAppPath
tell process "Finder"
tell window (appName & " info")
tell first scroll area
if (value of checkbox "Open in Low Resolution" as boolean) is false then
click checkbox "Open in Low Resolution"
end if
end tell
click (first button whose role description is "close button")
end tell
end tell
end tell
end run