use of HexEncoder class from flutter

Question

I am trying to use the class HexEncoder from https://docs.flutter.io/flutter/convert/HexEncoder-class.html and i can't make it work. Actually i am doing this to convert a list of bytes to a string:

import 'dart:convert';
import 'package:convert/convert.dart';

HexEncoder _hexEncoder;
List<int> value = [253, 165, 6, 147, 164, 226, 79, 177, 175, 207, 198, 235, 7, 100, 120, 37]
_hexEncoder.convert(value);

but throws me the error:

 The method 'convert' was called on null

Sorry for my poor knowledge of dart/flutter. I know i amb calling a null object, i just need to know the way to use this class. Thank you so much !

Günter Zöchbauer · Accepted Answer · 2018-07-12 09:24:39Z

26

This should do what you want:

import 'package:convert/convert.dart';

List<int> value = [253, 165, 6, 147, 164, 226, 79, 177, 175, 207, 198, 235, 7, 100, 120, 37];
var result = hex.encode(value);

This code

HexEncoder _hexEncoder;

just declares a variable _hexEncoder but doesn't initialize it with an encoder instance or any other value and therefor is null.

answered Jul 12, 2018 at 9:24

Günter Zöchbauer

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3 Comments

amorenew Over a year ago

api.flutter.dev/flutter/convert/HexDecoder-class.html is not updated is it a bug?

Günter Zöchbauer Over a year ago

I do not understand your question. What fo you mean with "updated"?

amorenew Over a year ago

Sorry it is a misunderstanding the parent class is HexCodec it is not an issue

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