Flutter打印机管理插件pos_printer_manager的使用

发布于 1周前 作者 yuanlaile 来自 Flutter

Flutter打印机管理插件pos_printer_manager的使用

此插件允许开发者通过ESC打印机无线或蓝牙打印(目前仅支持Android)。该插件提供了简便的方法来列出这些打印机。

示例

蓝牙打印机

_scan() async {
  print("scan");
  setState(() {
    _isLoading = true;
    _printers = [];
  });
  var printers = await BluetoothPrinterManager.discover();
  print(printers);
  setState(() {
    _isLoading = false;
    _printers = printers;
  });
}

_connect(BluetoothPrinter printer) async {
  var paperSize = PaperSize.mm80;
  var profile = await CapabilityProfile.load();
  var manager = BluetoothPrinterManager(printer, paperSize, profile);
  await manager.connect();
  print(" -==== connected =====- ");
  setState(() {
    _manager = manager;
    printer.connected = true;
  });
}

_startPrinter() async {
  final content = Demo.getShortReceiptContent();
  var bytes = await WebcontentConverter.contentToImage(content: content);
  var service = ESCPrinterService(bytes);
  var data = await service.getBytes(paperSize: PaperSize.mm58);
  if (_manager != null) {
    print("isConnected ${_manager.isConnected}");
    _manager.writeBytes(data, isDisconnect: false);
  }
}

网络打印机

_scan() async {
  setState(() {
    _isLoading = true;
    _printers = [];
  });
  var printers = await NetworkPrinterManager.discover();
  setState(() {
    _isLoading = false;
    _printers = printers;
  });
}

_connect(NetWorkPrinter printer) async {
  var paperSize = PaperSize.mm80;
  var profile = await CapabilityProfile.load();
  var manager = NetworkPrinterManager(printer, paperSize, profile);
  await manager.connect();
  setState(() {
    _manager = manager;
    printer.connected = true;
  });
}

_startPrinter() async {
  if (_data.isEmpty) {
    final content = Demo.getShortReceiptContent();
    var bytes = await WebcontentConverter.contentToImage(
      content: content,
      executablePath: WebViewHelper.executablePath(),
    );
    var service = ESCPrinterService(bytes);
    var data = await service.getBytes();
    if (mounted) setState(() => _data = data);
  }

  if (_manager != null) {
    print("isConnected ${_manager.isConnected}");
    _manager.writeBytes(_data, isDisconnect: false);
  }
}

USB打印机

_scan() async {
  setState(() {
    _isLoading = true;
    _printers = [];
  });
  var printers = await USBPrinterManager.discover();
  setState(() {
    _isLoading = false;
    _printers = printers;
  });
}

_connect(USBPrinter printer) async {
  var paperSize = PaperSize.mm80;
  var profile = await CapabilityProfile.load();
  var manager = USBPrinterManager(printer, paperSize, profile);
  await manager.connect();
  setState(() {
    _manager = manager;
    printer.connected = true;
  });
}

_startPrinter() async {
  if (_data.isEmpty) {
    final content = Demo.getShortReceiptContent();
    var bytes = await WebcontentConverter.contentToImage(
      content: content,
      executablePath: WebViewHelper.executablePath(),
    );
    var service = ESCPrinterService(bytes);
    var data = await service.getBytes();
    if (mounted) setState(() => _data = data);
  }

  if (_manager != null) {
    print("isConnected ${_manager.isConnected}");
    _manager.writeBytes(_data, isDisconnect: false);
  }
}

支持的设备

设备 网络 蓝牙 USB
Android
IOS
Macos
Windows
Linux

注:USB功能将计划在下一个版本中更新。

入门指南

flutter pub add pos_printer_manager

感谢以下插件:

完整示例Demo

您可以查看以下链接中的完整示例代码:

以下是完整的示例代码:

import 'package:flutter/material.dart';
import 'package:pos_printer_manager/pos_printer_manager.dart';
import 'package:pos_printer_manager_example/home_screen.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  /// 确保打印机配置已加载
  await CapabilityProfile.ensureProfileLoaded();
  print("ensured");
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(home: HomeScreen());
  }
}

更多关于Flutter打印机管理插件pos_printer_manager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打印机管理插件pos_printer_manager的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


pos_printer_manager 是一个用于在 Flutter 应用中管理 POS 打印机的插件。它支持通过蓝牙、Wi-Fi 和 USB 连接打印机,并且可以与各种 POS 打印机品牌兼容。以下是如何使用 pos_printer_manager 插件的详细步骤。

1. 添加依赖

首先,在 pubspec.yaml 文件中添加 pos_printer_manager 插件的依赖:

dependencies:
  flutter:
    sdk: flutter
  pos_printer_manager: ^0.0.1  # 请确认最新版本

然后运行 flutter pub get 以安装依赖。

2. 导入插件

在你需要使用打印功能的 Dart 文件中导入插件:

import 'package:pos_printer_manager/pos_printer_manager.dart';

3. 初始化打印机管理器

在使用打印机功能之前,建议先初始化打印机管理器:

void initPrinterManager() async {
  await PosPrinterManager.init();
}

4. 扫描并连接打印机

你可以通过蓝牙、Wi-Fi 或 USB 扫描并连接打印机。以下是一个通过蓝牙连接打印机的示例:

void scanAndConnectPrinter() async {
  // 扫描蓝牙设备
  List<BluetoothDevice> devices = await PosPrinterManager.scanBluetoothDevices();

  if (devices.isEmpty) {
    print('未找到蓝牙打印机');
    return;
  }

  // 选择第一个设备进行连接
  BluetoothDevice device = devices[0];

  // 连接打印机
  bool connected = await PosPrinterManager.connectBluetoothPrinter(device);

  if (connected) {
    print('打印机连接成功');
  } else {
    print('打印机连接失败');
  }
}

5. 打印内容

连接成功后,你可以发送打印任务。以下是一个简单的打印示例:

void printContent() async {
  String content = '''
  ============================
  欢迎使用POS打印机
  订单号: 123456
  金额: $100.00
  ============================
  ''';

  // 发送打印任务
  await PosPrinterManager.printText(content);

  print('打印任务已发送');
}

6. 断开连接

在完成打印任务后,建议断开与打印机的连接:

void disconnectPrinter() async {
  await PosPrinterManager.disconnectPrinter();
  print('打印机已断开');
}

7. 处理权限

在使用蓝牙或 Wi-Fi 连接打印机时,可能需要处理相关的权限。确保在 AndroidManifest.xmlInfo.plist 中添加必要的权限。

8. 错误处理

在实际使用中,建议添加错误处理逻辑,以应对可能出现的连接失败、打印失败等情况。

完整示例

以下是一个完整的示例,展示如何初始化、扫描、连接、打印和断开打印机:

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

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: PrinterScreen(),
    );
  }
}

class PrinterScreen extends StatefulWidget {
  [@override](/user/override)
  _PrinterScreenState createState() => _PrinterScreenState();
}

class _PrinterScreenState extends State<PrinterScreen> {
  [@override](/user/override)
  void initState() {
    super.initState();
    initPrinterManager();
  }

  void initPrinterManager() async {
    await PosPrinterManager.init();
  }

  void scanAndConnectPrinter() async {
    List<BluetoothDevice> devices = await PosPrinterManager.scanBluetoothDevices();

    if (devices.isEmpty) {
      print('未找到蓝牙打印机');
      return;
    }

    BluetoothDevice device = devices[0];
    bool connected = await PosPrinterManager.connectBluetoothPrinter(device);

    if (connected) {
      print('打印机连接成功');
    } else {
      print('打印机连接失败');
    }
  }

  void printContent() async {
    String content = '''
    ============================
    欢迎使用POS打印机
    订单号: 123456
    金额: $100.00
    ============================
    ''';

    await PosPrinterManager.printText(content);
    print('打印任务已发送');
  }

  void disconnectPrinter() async {
    await PosPrinterManager.disconnectPrinter();
    print('打印机已断开');
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('POS打印机管理'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: scanAndConnectPrinter,
              child: Text('扫描并连接打印机'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: printContent,
              child: Text('打印内容'),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: disconnectPrinter,
              child: Text('断开打印机'),
            ),
          ],
        ),
      ),
    );
  }
}
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