Flutter Zstandard压缩解压插件zstandard_windows的使用

Flutter Zstandard压缩解压插件zstandard_windows的使用

zstandard_windows 是 zstandard 在 Windows 平台上的实现。本文将详细介绍如何在 Flutter 应用中使用该插件进行数据的压缩与解压。

使用方法

首先，确保已经在项目的 pubspec.yaml 文件中添加了 zstandard_windows 插件依赖：

dependencies:
  zstandard_windows: ^版本号

然后运行 flutter pub get 来获取插件。

示例代码

以下是一个完整的示例，展示了如何使用 zstandard_windows 进行数据的压缩与解压。

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:zstandard_windows/zstandard_windows.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> {
  final Uint8List _originalData = Uint8List.fromList([
    10,
    20,
    30,
    4,
    3,
    3,
    10,
    20,
    30,
    10,
    20,
    30,
    4,
    3,
    3,
    10,
    20,
    30,
    10,
    20,
    30,
    4,
    3,
    3,
    10,
    20,
    30,
    10,
    20,
    30,
    4,
    3,
    3,
    10,
    20,
    30
  ]);

  Uint8List? _compressedData;

  Uint8List? _decompressedData;

  String _platformVersion = '未知';

  final _zstandard = ZstandardWindows();

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

  Future<void> initPlatformState() async {
    String platformVersion;
    try {
      platformVersion = await _zstandard.getPlatformVersion() ?? '未知平台版本';
    } on Exception {
      platformVersion = '无法获取平台版本。';
    }

    if (!mounted) return;

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

  Future<void> checkCompression() async {
    Uint8List? compressed;
    Uint8List? decompressed;

    try {
      compressed = await _zstandard.compress(_originalData);
      decompressed = await _zstandard.decompress(compressed ?? Uint8List(0));
    } catch (e) {
      if (kDebugMode) {
        print(e);
      }
    }

    if (!mounted) return;

    setState(() {
      _compressedData = compressed;
      _decompressedData = decompressed;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('插件示例应用'),
        ),
        body: Center(
          child: Padding(
            padding: const EdgeInsets.all(15.0),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Text('运行于: $_platformVersion\n'),
                Text('原始数据: ${_originalData.join(',')}\n'),
                Text('压缩后数据: ${_compressedData?.join(',')}\n'),
                Text('解压后数据: ${_decompressedData?.join(',')}\n'),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

代码解释

1. 导入必要的库：

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

2. 初始化应用：

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

3. 定义应用状态管理类：

   class MyApp extends StatefulWidget {
     const MyApp({super.key});
   
     [@override](/user/override)
     State<MyApp> createState() => _MyAppState();
   }
   
   class _MyAppState extends State<MyApp> {
     final Uint8List _originalData = Uint8List.fromList([...]);
     Uint8List? _compressedData;
     Uint8List? _decompressedData;
     String _platformVersion = '未知';
     final _zstandard = ZstandardWindows();
   

4. 初始化平台状态：

   [@override](/user/override)
   void initState() {
     super.initState();
     initPlatformState();
     checkCompression();
   }
   
   Future<void> initPlatformState() async {
     String platformVersion;
     try {
       platformVersion = await _zstandard.getPlatformVersion() ?? '未知平台版本';
     } on Exception {
       platformVersion = '无法获取平台版本。';
     }
   
     if (!mounted) return;
   
     setState(() {
       _platformVersion = platformVersion;
     });
   }
   

5. 执行压缩和解压缩操作：

   Future<void> checkCompression() async {
     Uint8List? compressed;
     Uint8List? decompressed;
   
     try {
       compressed = await _zstandard.compress(_originalData);
       decompressed = await _zstandard.decompress(compressed ?? Uint8List(0));
     } catch (e) {
       if (kDebugMode) {
         print(e);
       }
     }
   
     if (!mounted) return;
   
     setState(() {
       _compressedData = compressed;
       _decompressedData = decompressed;
     });
   }
   

6. 构建UI界面：

   [@override](/user/override)
   Widget build(BuildContext context) {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
           title: const Text('插件示例应用'),
         ),
         body: Center(
           child: Padding(
             padding: const EdgeInsets.all(15.0),
             child: Column(
               mainAxisSize: MainAxisSize.min,
               children: [
                 Text('运行于: $_platformVersion\n'),
                 Text('原始数据: ${_originalData.join(',')}\n'),
                 Text('压缩后数据: ${_compressedData?.join(',')}\n'),
                 Text('解压后数据: ${_decompressedData?.join(',')}\n'),
               ],
             ),
           ),
         ),
       ),
     );
   }