Flutter插件cbcplugin的介绍与使用

Flutter插件cbcplugin的介绍与使用

cbcplugin 是一个支持Android平台的插件，它实现了SEED_CBC 128字节（UTF-8）算法。该插件基于KISA提供的C++/Java源码实现。

示例代码

以下是一个完整的示例代码，展示了如何在Flutter应用中使用cbcplugin插件进行字符串的加密操作。

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

import 'package:flutter/services.dart';
import 'package:cbcplugin/cbcplugin.dart';

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

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

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _cbcpluginPlugin = Cbcplugin();

  [@override](/user/override)
  void initState() {
    super.initState();
    initPlatformState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String encodeTask;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      encodeTask = await _cbcpluginPlugin.encodeStringWithCBC("/task/login");
    } catch (e) {
      encodeTask = 'Error occurred: $e';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = encodeTask;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Text('Encoded String is: $_platformVersion\n'),
        ),
      ),
    );
  }
}

解释

1. 导入必要的库：

   import 'package:flutter/material.dart';
   import 'dart:async';
   import 'package:flutter/services.dart';
   import 'package:cbcplugin/cbcplugin.dart';
   

2. 定义主应用类 MyApp：

   class MyApp extends StatefulWidget {
     const MyApp({super.key});
   
     [@override](/user/override)
     State<MyApp> createState() => _MyAppState();
   }
   

3. 初始化状态并调用异步方法：

   class _MyAppState extends State<MyApp> {
     String _platformVersion = 'Unknown';
     final _cbcpluginPlugin = Cbcplugin();
   
     [@override](/user/override)
     void initState() {
       super.initState();
       initPlatformState();
     }
   

4. 异步方法 initPlatformState：

   Future<void> initPlatformState() async {
     String encodeTask;
     try {
       encodeTask = await _cbcpluginPlugin.encodeStringWithCBC("/task/login");
     } catch (e) {
       encodeTask = 'Error occurred: $e';
     }
   
     if (!mounted) return;
   
     setState(() {
       _platformVersion = encodeTask;
     });
   }
   

5. 构建应用界面：

   [@override](/user/override)
   Widget build(BuildContext context) {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
           title: const Text('Plugin example app'),
         ),
         body: Center(
           child: Text('Encoded String is: $_platformVersion\n'),
         ),
       ),
     );
   }