Re: Runtime question - Special requirements to register overridden methods?
Re: Runtime question - Special requirements to register overridden methods?
- Subject: Re: Runtime question - Special requirements to register overridden methods?
- From: Ben Dougall <email@hidden>
- Date: Tue, 1 Jul 2003 18:02:05 +0100
there's some talk about the objc_method structure, not sure if it's
more than what you've already got, in 'cocoa programming' in appendix
a, if you have access to that.
On Tuesday, July 1, 2003, at 12:42 pm, Sherm Pendley wrote:
Here's the situation:
I write and maintain a "foreign" language bridge. The code for that
bridge creates and registers a number of classes with the Objective-C
runtime. Classes are (seemingly) registered correctly. I can create
and initialize instances of them, and messages sent to them (from
either end of the bridge) result in the correct calls to my
implementation function.
With one exception, that is. Inherited methods are correctly sent to
the super class, and new methods that don't exist in the super class
are correctly called in my new sub class. But, super class methods
that are overridden in my sub class aren't called when I message them
from Objective-C - no call is ever made to the registered
implementation function in that case.
I have gone over and over the registered class structure, both before
it's sent to objc_addClass() and when it's returned from
objc_getClass(), with no luck. I've tried registering the method list
along with the class, and adding it later with class_addMethods(),
with the same result either way.
The one example I've been able to find, in Apple's "The Objective-C
Programming Language," is of no help; it leaves the method lists
empty, with the comment "We can add methods later." Unfortunately,
"later" never seems to arrive - the class_addMethods() function has
only a terse description and no example code.
Can anyone point me to a better example of registering a class,
including methods - preferably, methods that override those in the
super class? Is there any special magic required to register such
methods, beyond the basic selector, signature, IMP information?
sherm--
"I have no special gift, I am only passionately curious." - Albert
Einstein
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