code: def get_next(self):
      # Read the header
      self._curr_event = None
      header_str = self.file_handle.read(8)
      if len(header_str) != 8:
          # Hit EOF so raise and exit
          raise EOFError("No more events to read on LFS.")
      header = struct.unpack("Q", header_str)
      header_len = int(header[0])
      event_str = self.file_handle.read(header_len)
  
      self._curr_event = event_str
  
file_path: VisualDL/visualdl/reader/record_reader.py
imports: from visualdl.io import bfile
  import struct
label_desc: Use image node_id 2 for calling the _RecordReader obj's underlying member method code with example usage: obj.get_next() without return types