> 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
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________ 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
