Flutter网络通信插件sio_core_light的使用

发布于 1周前 作者 phonegap100 来自 Flutter

Flutter网络通信插件sio_core_light的使用

sio_core_light 是一个用于构建区块链交易的轻量级库，使用Dart语言开发，可以在Flutter框架中使用。该库与 trust_wallet_core_lib 一起工作，因此请确保已经设置了 trust_wallet_core_lib。

支持的链列表可以在这里查看：支持的链。

示例代码

以下是一个完整的示例代码，展示了如何使用 sio_core_light 库进行区块链交易。

import 'package:flutter/material.dart';
import 'package:sio_core_light/sio_core_light.dart';
import 'package:trust_wallet_core_lib/trust_wallet_core_ffi.dart';
import 'package:trust_wallet_core_lib/trust_wallet_core_lib.dart' as trust_core;

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'sio_core_light 示例',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'sio_core_light 示例'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  late trust_core.HDWallet wallet;

  final mnemonic =
      'horror select baby exile convince sunset outside vehicle write decade powder energy';

  Future<String> example() async {
    if (Mnemonic.isValid(mnemonic: mnemonic)) {
      wallet = Mnemonic.import(mnemonic: mnemonic);
      debugPrint('助记词: $mnemonic');
    } else {
      throw Exception(['助记词无效!']);
    }
    final solAddress = wallet.getAddressForCoin(TWCoinType.TWCoinTypeSolana);
    debugPrint('Solana 地址: $solAddress');

    const toAddress = '3fTR8GGL2mniGyHtd3Qy2KDVhZ9LHbW59rCc7A3RtBWk';
    final amount = BigInt.from(2000);
    final fee = BigInt.from(5000);
    // 这必须从网络正确地通过 API 获取
    const latestBlockHash = '11111111111111111111111111111111';

    final signedSolanaTx = BuildTransaction.solana(
      recipient: toAddress,
      amount: amount,
      wallet: wallet,
      latestBlockHash: latestBlockHash,
      fee: fee,
    );
    debugPrint('原始 Solana 交易: ${signedSolanaTx.toJson()}');

    const tokenMintAddress = 'SioTkQxHyAs98ouRiyi1YDv3gLMSrX3eNBg61GH7NrM';
    final signedSolanaTokenTx = BuildTransaction.solanaToken(
      amount: amount,
      decimals: 8,
      tokenMintAddress: tokenMintAddress,
      recipientSolanaAddress: toAddress,
      wallet: wallet,
      latestBlockHash: latestBlockHash,
      fee: fee,
    );
    debugPrint('原始 Solana 代币交易: ${signedSolanaTokenTx.toJson()}');

    return '成功';
  }

  @override
  void initState() {
    trust_core.TrustWalletCoreLib.init();
    super.initState();
    example();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: const Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [],
      ),
    );
  }
}

代码说明

  1. 导入必要的库：

    import 'package:flutter/material.dart';
import 'package:sio_core_light/sio_core_light.dart';
import 'package:trust_wallet_core_lib/trust_wallet_core_ffi.dart';
import 'package:trust_wallet_core_lib/trust_wallet_core_lib.dart' as trust_core;

  2. 初始化应用：

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

  3. 创建主应用界面：

    class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'sio_core_light 示例',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'sio_core_light 示例'),
    );
  }
}

  4. 创建首页状态管理：

    class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

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

  5. 定义首页状态类：

    class _MyHomePageState extends State<MyHomePage> {
  late trust_core.HDWallet wallet;

  final mnemonic =
      'horror select baby exile convince sunset outside vehicle write decade powder energy';

  Future<String> example() async {
    if (Mnemonic.isValid(mnemonic: mnemonic)) {
      wallet = Mnemonic.import(mnemonic: mnemonic);
      debugPrint('助记词: $mnemonic');
    } else {
      throw Exception(['助记词无效!']);
    }
    final solAddress = wallet.getAddressForCoin(TWCoinType.TWCoinTypeSolana);
    debugPrint('Solana 地址: $solAddress');

    const toAddress = '3fTR8GGL2mniGyHtd3Qy2KDVhZ9LHbW59rCc7A3RtBWk';
    final amount = BigInt.from(2000);
    final fee = BigInt.from(5000);
    // 这必须从网络正确地通过 API 获取
    const latestBlockHash = '11111111111111111111111111111111';

    final signedSolanaTx = BuildTransaction.solana(
      recipient: toAddress,
      amount: amount,
      wallet: wallet,
      latestBlockHash: latestBlockHash,
      fee: fee,
    );
    debugPrint('原始 Solana 交易: ${signedSolanaTx.toJson()}');

    const tokenMintAddress = 'SioTkQxHyAs98ouRiyi1YDv3gLMSrX3eNBg61GH7NrM';
    final signedSolanaTokenTx = BuildTransaction.solanaToken(
      amount: amount,
      decimals: 8,
      tokenMintAddress: tokenMintAddress,
      recipientSolanaAddress: toAddress,
      wallet: wallet,
      latestBlockHash: latestBlockHash,
      fee: fee,
    );
    debugPrint('原始 Solana 代币交易: ${signedSolanaTokenTx.toJson()}');

    return '成功';
  }

  @override
  void initState() {
    trust_core.TrustWalletCoreLib.init();
    super.initState();
    example();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: const Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [],
      ),
    );
  }
}

更多关于Flutter网络通信插件sio_core_light的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter网络通信插件sio_core_light的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然，下面是一个关于如何在Flutter项目中使用sio_core_light插件进行网络通信的代码示例。sio_core_light是一个轻量级的Socket.IO客户端，适用于Flutter。

1. 添加依赖

首先，在你的pubspec.yaml文件中添加sio_core_light依赖：

dependencies:
  flutter:
    sdk: flutter
  sio_core_light: ^x.y.z  # 请将x.y.z替换为最新版本号

然后运行flutter pub get来获取依赖。

2. 导入插件

在你的Dart文件中导入sio_core_light：

import 'package:sio_core_light/sio_core_light.dart';

3. 建立Socket连接

下面是一个简单的示例，展示如何使用sio_core_light连接到Socket.IO服务器，并发送和接收消息。

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  SocketIO? _socket;

  @override
  void initState() {
    super.initState();
    
    // 连接到Socket.IO服务器
    _connectToServer();
  }

  void _connectToServer() {
    const String url = 'http://your-socket-io-server-url';
    
    _socket = SocketIO(url, Option(
      transports: ['websocket'], // 你可以根据需要指定传输方式
    ));

    _socket!.onConnect((data) {
      print('Connected to server');
      
      // 连接成功后，可以发送消息
      _socket!.emit('message', 'Hello Server!');
    });

    _socket!.onMessage((data) {
      print('Received message: $data');
    });

    _socket!.onError((error) {
      print('Error: $error');
    });

    _socket!.onDisconnect((data) {
      print('Disconnected from server');
    });

    // 连接到服务器
    _socket!.connect();
  }

  @override
  void dispose() {
    // 断开连接并释放资源
    _socket?.disconnect();
    _socket = null;
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Socket.IO Example'),
        ),
        body: Center(
          child: Text('Check console for socket events'),
        ),
      ),
    );
  }
}

4. 运行应用

将上述代码添加到你的Flutter项目中，并运行应用。你应该能够在控制台中看到连接、消息发送和接收的日志输出。

注意事项

  1. 服务器URL：确保将http://your-socket-io-server-url替换为你的Socket.IO服务器的实际URL。
  2. 错误处理：为了简化示例，错误处理较为基础。在实际应用中，你可能需要更详细的错误处理和重连逻辑。
  3. 依赖版本：确保使用最新版本的sio_core_light插件，以获取最新的功能和修复。

这样，你就可以在Flutter项目中使用sio_core_light插件进行网络通信了。

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