Get NSTextFieldCell value using AppleScript - objective-c

Question

I am trying to automate a few tasks where I need to get the text displayed on a dialog box (the 6 digit code).
Accessibility Inspector revealed the following hierarchy:
I am a beginner in the field of AppleScript and have read a few examples where something similar could be done like this:
set myText to textField's stringValue() as text
But I'm not sure if this could work in my case, as the Accessibility Inspector does not show any variable names for NSTextFieldCell which contains the 6 digit code.
How can I extract the 6 digit code in the NSTextFieldCell and possibly return this value so that a shell script can use this code?
I have something like this right now -
tell application "FollowUpUI"
activate
# get the 6 digit code
end tell
Update
After some help, i have tried to traverse to the text field
tell application "System Events"
repeat with theProcess in processes
#initialize
tell theProcess
set processName to name
set allWindows to windows
end tell
#check if process exists
if processName is "FollowUpUI" then
activate
say "FollowUpUI found"
set windowsCount to count of the allWindows
#only one window should exist
if windowsCount is 1 then
say "1 window was found"
tell window 1
tell group 1
tell text field 1
set code to value
end tell
end tell
end tell
end if
end if
end repeat
end tell
but i've got stuck because of an error -
System Events got an error: cant get window 1. Invalid index.
I am not sure if this is a syntax error. Any pointers would be helpful. Thanks

Answer 1

The error occurs because you have to reference window 1 of process "FollowUpUI"
Your code is too complicated, you just need to check if the process exists
tell application "System Events"
if exists process "FollowUpUI" then
tell process "FollowUpUI"
tell window 1
tell static text 1 of group 1
set code to its value
end tell
end tell
end tell
end if
end tell
If the code is a part of a workflow you have to wait until the window is open
tell application "System Events"
repeat until exists window 1 of process "FollowUpUI"
delay 0.2
end repeat
tell window 1 of process "FollowUpUI"
tell static text 1 of group 1
set code to its value
end tell
end tell
end tell
I added its before value to make sure that it refers to the current reference (the text field)
As you don't send key or mouse events to the window you don't need to activate anything.

Answer 2

Not an answer but I can't paste code in a comment. Here's a trick to get the UI Element. Hit Command-Shift-4 to get a cursor with coordinates. Aim at the UI Element and remember the coordinates. Click to get the arrow cursor back. Use the coordinates in this script.
activate application "FollowUpUI"
tell application "System Events"
tell application process "FollowUpUI"
click at {290, 150}
end tell
end tell
Script Editor must be allowed to control the computer. You can set this in the System prefs, Security & Privacy, Privacy.