如何在Dart/Flutter中读取本地图像文件的字节? [英] How to read bytes of a local image file in Dart/Flutter?

问题描述

我想使用一个已添加到代码中的占位符图像文件作为"assets/placeholder.png"，但出现找不到文件"错误.这就是我在dartlang文档中所做的事情...

I would like to use a placeholder image file that I've added to my code as "assets/placeholder.png", but I'm getting a File not found error. This is how I'm doing it from the dartlang documentation...

var bytes = await new File('assets/placeholder.png').readAsBytes();
String base64 = CryptoUtils.bytesToBase64(bytes);

bytes变量每次都会出错.如何保存本地保存的图像文件的字节?

The bytes variable errors every time. How can I save the bytes of a locally saved image file?

推荐答案

在Flutter环境中，如果要访问资产，则必须使用AssetBundle(

With Flutter environment, you have to use AssetBundle if you want to access to your assets (https://flutter.io/assets-and-images/).

import 'package:flutter/services.dart' show rootBundle;


ByteData bytes = await rootBundle.load('assets/placeholder.png');

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