code: def proto_to_bytes(
      self,
      root_obj,
  ):
      object_queue = queue.Queue()
      object_queue.put(ObjInfo(root_obj, -1, -1))
      with tempfile.TemporaryFile() as f:
          self.write_obj_queue_to_file(object_queue, f)
          f.seek(0)
          return f.read()
      return None
  
imports: from google.protobuf.descriptor import FieldDescriptor
  from utils.util import mace_check
  import sys
  import struct
  import tempfile
label_desc: Use image node_id 13 for calling the ProtoConverter obj's underlying member method code with example usage: obj.proto_to_bytes(root_obj) and returns: None, f