Are you saying that Apple's well-documented approach to see if an object is derived from NSProxy does not work? If that's the case, you need to submit a bug report to Apple. That's a serious issue that only Apple can help you with.
If you are using objects not derived from NSObject nor NSProxy, then change your design. -- Gary L. Wade (Sent from my iPad) http://www.garywade.com/ > On Dec 13, 2014, at 11:40 AM, Maxthon Chan <m...@maxchan.info> wrote: > > Ain’t work! Will crash if an Object derivative showed up. > > I am scanning ALL loaded classes and only subclasses of a certain class is > interested. But due to the nature of this class scanning before I can make > sure that the class derives from NSObject I cannot call any method on it. > >> On Dec 14, 2014, at 03:34, Gary L. Wade <garyw...@desisoftsystems.com> wrote: >> >> If all you care about is if an object is a proxy or not, look at isProxy. >> -- >> Gary L. Wade (Sent from my iPad) >> http://www.garywade.com/ >> >>> On Dec 13, 2014, at 11:06 AM, Maxthon Chan <m...@maxchan.info> wrote: >>> >>> What I am doing here is scanning all loaded classes for subclasses of a >>> certain class. Before any NSObject method can be issued I have to check if >>> it is actually NSObject or NSProxy derivative instead of an Object >>> derivative that does not support NSObject methods. This calls for runtime >>> equivalent for one of the following NSObject methods: >>> >>> - [NSObject respondsToSelector:(SEL)aSelector] = >>> class_respondsToSelector(Class, SEL) // this crashed. >>> + [NSObject conformsToProtocol:(Protocol *)aProtocol] = >>> class_conformsToProtocol(Class, Protocol *) // check for NSObject protocol, >>> this does not work. >>> + [NSObject isSubclassOfClass:(Class)aClass] // no equivalent, have to >>> implement it myself >>> >>> I ended up creating this: >>> >>> BOOL class_isSubclassOfClass(Class cls, Class other) >>> { >>> for (Class c = cls; c; c = class_getSuperclass(c)) >>> if (c == other) >>> return YES; >>> return NO; >>> } >>> >>> If i remembered it right GNUstep runtime have this function. I will file a >>> bug report to Apple and ask them to add this, as it is useful in class >>> scanning and i am using this technique heavily in jailbreak detection. >>> >>>> On Dec 14, 2014, at 01:20, Kyle Sluder <k...@ksluder.com> wrote: >>>> >>>> On Sat, Dec 13, 2014, at 10:19 AM, Phillip Mills wrote: >>>>> Why do you think the problem is with “respondsToSelector:”? The error >>>>> says you’re accessing past the end of a string. >>>> >>>> Because the crash happens in a call stack that originates in >>>> class_respondsToSelector, and involves none of Maxthon's code. >>>> >>>> --Kyle Sluder > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
