def invoke(self, robj, method, *args):
"""
Invokes a method on an object, and returns the return value.
"""
response = self.sendAndReceive(ReflectionRequestFactory.invoke(robj._ref, method).setArguments(args))
if response is None:
raise ReflectionException("expected a response to INVOKE")
elif response.reflection_response.status == Message.ReflectionResponse.SUCCESS:
return ReflectedType.fromArgument(response.reflection_response.result, reflector=self)
else:
raise ReflectionException(response.reflection_response.errormessage)
