Why can't I add these two strings together? - applescript-objc

Question

on oneButtonClicked_(sender)
set faceNumber's setStringValue() to faceNumber's stringValue() & "1"
end oneButtonClicked_
I get this error: "Can’t make «class ocid» id «data optr000000000058B37BFF7F0000» into type list, record or text. (error -1700)"
faceNumber is a label and when the user clicks the button, I want to add string of "1" to it. So for example, if the user clicked the button 5 times

Answer 1

stringValue returns an NSString(wrong answer) CFString. You have to make a real AppleScript String to use it.
BTW your code set faceNumber's setStringValue() is not correct. The reasons are:
The Cocoa handlers are always using the underscore.
If you use the setter setStringValue() you don't need to use set x to
If you want to use setStringValue() you must give the parameter between the parentheses
Now put everything together:
on oneButtonClicked_(sender)
faceNumber's setStringValue_((faceNumber's stringValue) as string & "1")
end oneButtonClicked_
or (to have it clearer):
on oneButtonClicked_(sender)
tell faceNumber
set currentValue to (its stringValue) as string
setStringValue_(currentValue & "1")
end tell
end oneButtonClicked_
I hope you like the answer, after pressing the button twice you have an 11 at the end of the label.
Cheers, Michael / Hamburg