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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