debugging 错误“失败的主机查找:当我在Flutter中使用www.example.com()时,会出现“$host”Image.network

tjvv9vkg  于 2023-06-23  发布在  Flutter
关注(0)|答案(1)|浏览(158)

最近我更新了Flutter SDK的版本,在使用Image.network()时遇到了一个错误:

socket_patch.dart
  static Future<List<InternetAddress>> lookup(String host,
      {InternetAddressType type = InternetAddressType.any}) {
    return _IOService._dispatch(_IOService.socketLookup, [host, type._value])
        .then((response) {
      if (isErrorResponse(response)) {
        throw createError(response, "Failed host lookup: '$host'"); // Debug mode stops here
      }
      return [
        for (List<Object?> result in (response as List).skip(1))
          _InternetAddress(
              InternetAddressType._from(result[0] as int),
              result[1] as String,
              host,
              result[2] as Uint8List,
              result[3] as int)
      ];
    });
  }

然后,当我恢复调试器时,错误消失了。它不依赖于链接,我把它放在Image.network()中。

Main.dart
import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Image.network(
                'https://s3-alpha-sig.figma.com/img/738e/6e77/a92971e6075b85d18be0de93205d90cb?Expires=1687737600&Signature=CviOR2T3fFb157NIU9razzN2LfobSUjCGyZ76AI506SnPxZn8ec2WgO7251cjwYSENykkTl7Y-K~V7jEMXnh3r072fBmyJUj7ptB2vyHkOTg3HKAMS0GhSorPbmVem7~0jPn4kKk5Mrcgapkf-GaUVZTvmMc5~pBZCfjRkysIkLPOxj8f2ArUqkRW1eCBNsbxEqoJfvnQMOhcsnMZsURMznUrYKRETyVxdbL0lo2YEv7ZWuIUfSu8LEFDpx2t60IIijSwV9bQ9NU2DDjTWncVNyHr5HmElMiejKwCXexvaSCYQJXdCkBectc0JW0-aaFjfgqbcPrbvgZ53Q~K8QzBg__&Key-Pair-Id=APKAQ4GOSFWCVNEHN3O4,'),
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

有人能帮我解决这个问题吗?我找了很多地方,但没有找到任何关于它的东西。

nle07wnf

nle07wnf1#

我在模拟器上遇到了主机查找错误,但当我禁用热点,切换Wi-Fi网络或在设备上使用VPN时,它得到了解决。然而,当我执行您提供的代码时,它成功地产生了结果,没有任何错误,只要我从链接中删除了额外的逗号(,)。

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