That does not mean that they're using "Object" only that they're using a base class other than "NSObject" or "NSProxy". Why can't you just ignore such classes?
Sent from my iPhone > On Dec 14, 2014, at 23:31, Maxthon Chan <m...@maxchan.info> wrote: > > My class scanning returned several OS* classes that does not conform to > NSObject protocol. > >>> On Dec 15, 2014, at 00:29, Clark S. Cox III <clarkc...@gmail.com> wrote: >>> >>> >>> On Dec 13, 2014, at 11:57, Maxthon Chan <m...@maxchan.info> wrote: >>> >>> NSProxy checking actually work, but throwing those classes that derive from >>> Object class (note I used capitalised O here, the old Object class from >>> early NeXT times, also used heavily in OS X kernel, GCD and Mach ports) >> >> What makes you think that Object is used in *any* of those places? >> >>> into the mix means that no method can be sent before class is determined. I >>> would suggest Apple add one runtime function class_isSubclassOfClass() that >>> mirrors the functionality of NSObject and NSProxy method isSubclassOfClass >>> so that derivatives of the old Object class can be detected more easily. >>> >>>> On Dec 14, 2014, at 03:49, Gary L. Wade <garyw...@desisoftsystems.com> >>>> wrote: >>>> >>>> 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/clarkcox3%40gmail.com >>> >>> This email sent to clarkc...@gmail.com >
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