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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