writeAsBytes writeAsString

import 'dart:io';
import 'dart:convert';


main()async{
  File a = File('C:\\aria2\\1.txt');
  var c = read(a);
  print(c);
  var d = utf8.decode(c);
  print(d);
//  await a.writeAsBytes(c+'\ntest');
//  print(read(a));
}

read(File a){
  var b = a.readAsBytesSync();
  print('================');
  return b;
}

================
[116, 101, 115, 116, 116, 101, 115, 116, 10, 116, 101, 115, 116, 10, 116, 101, 115, 116]
testtest
test
test