[Pythonmac-SIG] PyObjC: debugging error-less crashes?

[Daniel Ashbrook]

Ronald Oussoren wrote:
>> There was a case where I had to decorate a couple of functions with 
>> @objc.accessor or I got the same kind of no-error crash. Is it the 
>> same cause? Is there a way to know when I need to use that vs not?
 >
> That depends on the method names you're using. "Regular" accessors 
> ("setFoo_" and "foo") should work without an objc.accessor decorator.


The methods aren't of that form, because they're not really accessor 
methods as far as I understand it. The problem only occurs when I include:

def someMethod_(...)
   #code...
   undo = self.undoManager()
   undo.prepareWithInvocationTarget_(self).someReverseMethod_(p, i)
   #code...

If I don't add @objc.accessor to someMethod_() and someReverseMethod_() 
I get the unexplained crash. Those methods *do* modify an instance 
variable (directly); is that why they require the accessor decorator?


dan