[Pyobjc-dev] Return value "handler" / NSEvent.addLocalMonitorForEventsMatchingMask_handler_

[Just v. R. <jus...@gm...>]

From a running PyObjC/Cocoa app, I try to do the following:


from AppKit import NSKeyDownMask, NSEvent

def myHandler(event):
   print(event)
   return event

mask = NSKeyDownMask
monitor = NSEvent.addLocalMonitorForEventsMatchingMask_handler_(mask, myHandler)


(one could call this in an applicationDidFinishLaunching_() app delegate method)


The handler indeed gets called when I press a key, but the caller complains it’s returning None:

ValueError: <function myHandler at 0x1146b4c80>: returned None, expecting a value

As you can see in my code above, the handler _does_ return a value, and I know from the print() output that it’s indeed not None.

Can a handler return something with PyObjC, or should I do something special with the cal/function/lmethod signature?

Thanks for any clues,

Just