@ccc Done, thanks and sorry, I always try to not forget it, but, my memory is often overloaded 😢

@JonB, still, can be difficult to tell where the error really comes from, when you have these bits and pieces of eval_js flying around.

Okay! Thanks for helping :-)p

That did the trick ! Thanks

It looks like you have a script of your own called ctypes.py in a "temp" folder. Naming your scripts like built-in modules is never a good idea, try renaming it to something like ctypes_tests.py (and restart Pythonista if that doesn't help right away).

Ok, found a working solution in the MapView objc sample:

Need to use a dummy ui.Button and set the Python click handler function as its "action". Then can use the button as the target and sel("invokeAction:") as the action when defining the Objc accessory button.