[Openmcl-devel] ObjC callbacks - self and dynamic extent
beque at telia.com
Thu Feb 10 22:51:52 UTC 2005
On torsdag, feb 10, 2005, at 22:00 Europe/Stockholm, alex crain wrote:
> This doesn't work...
> ? (defvar *x* nil)
> ? (define-objc-method ((:void my-method sender) my-class)
> (setq *x* sender))
> |-[MyClass myMethod:]|
> ? *x*
> #<BOGUS object @ #xCE63E>
> Not what I had in mind. I gather from reading the lisp kernel code
> that sender is
> dereferenced off the stack, my question is how to get it off without
> copying the object.
> I can to some hackery like this (for NSDocuments)
What I have done, and what seems to work is:
(setq *ptr* (%setf-macptr (%null-ptr) self))
This copies the macptr into a newly allocated macptr.
> (send (send (send self 'window-controllers) :object-at-index 0)
> Which works, but I can't believe that there isn't an easier way.
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