file1.txt ----------------- class Person end module Speak end The task is to printout all the constants listed in the file. In this case there are Person and Speak. I need to handle two cases. 1) The system loads the file for the first time. I guess in this case I can use ObjectSpace.each_object or ObjectSpace.some_method from API to get before and after picture. Subtract the before picture and I will get the constants. 2) The second case is when file1.txt is already loaded into the application. So in this case I can't do before and after thing. How can I get constants in this case without before and after picture. Thanks -- Posted via http://www.ruby-forum.com/.