How to get the mappings between an object's MessageInfo.type and its respective Protobuf message type?

`The mapping between an object's MessageInfo.type and its respective Protobuf message type must by extracted from the iWork applications at runtime. Attaching to Keynote via a debugger and inspecting [TSPRegistry sharedRegistry]` I saw this message，but how can i Attaching to Keynote via a debugger. Thank you very mutch