Re: Replacement for descriptionForInstanceMethod:

[Andreas Höschler]

Hi Fred,

You should have a look at GSProtocolGetMethodDescriptionRecursive in Additions/GSObjCRuntime.m. I think this should be able to provide the required functionality.

Thanks a lot. I do

         NSMethodSignature *objcSignature = nil;

         #ifdef __APPLE__

           {

            struct objc_method_description *methodDescription = NULL;

            methodDescription = [_protocol descriptionForInstanceMethod:aSelector];

            if (methodDescription == NULL) methodDescription = [_protocol descriptionForClassMethod:aSelector];

            if (methodDescription != NULL) types = methodDescription->types;

           }

         #else

           {

            struct objc_method_description desc;

            desc = GSProtocolGetMethodDescriptionRecursive(_protocol, aSelector, YES, YES);

            if (desc.name == NULL && desc.types == NULL)

              {

               desc = GSProtocolGetMethodDescriptionRecursive(_protocol, aSelector, YES, NO);

              }

            types = desc.types;

           }

         #endif

         if (types) objcSignature = [NSMethodSignature signatureWithObjCTypes:types];

now. The Apple part works on Macs and with my ancient GNUstep tree. I do not know yet, whether the non-Apple part works on Ubuntu (current GNUstep) but will try once the SIGSEGV problem is figured out. :-)

It's a little surprising to me why

Protocol * _protocol = @protocol(TestProtocol);
SEL aSelector = @selector(doIt);
struct objc_method_description _methodDescription = protocol_getMethodDescription(_protocol, aSelector, NO, YES);
if (_methodDescription.name == NULL) _methodDescription = protocol_getMethodDescription(_protocol, aSelector, NO, NO);
NSLog(@"_methodDescription.name %@", NSStringFromSelector(_methodDescription.name));

does not work on Apple as I understood this was the recommended way to do it now!? But it simply does not work, therefore reverting back back to the deprecated approach (deprecated descriptionForInstanceMethod: method of Protocol).

Thanks so much,

 Andreas