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
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