Flutter打印机控制插件flutter_urovo_pos_printer_plugin的使用

发布于 1周前 作者 sinazl 来自 Flutter

Flutter打印机控制插件flutter_urovo_pos_printer_plugin的使用

flutter_urovo_pos_printer_plugin

flutter_urovo_pos_printer_plugin 是一个用于 Urovo 打印机的 Flutter 插件。它生成 Urovo 打印命令，可以发送到 Urovo 的热敏打印机。

开始使用

此项目是一个起点，用于 Flutter 的插件包开发，包含 Android 和/或 iOS 平台特定的实现代码。

获取帮助

有关 Flutter 开发的帮助，请查看 Flutter 官方文档，其中包括教程、示例、移动开发指南和完整的 API 参考。

打印管理或设备

更多关于 Urovo 打印机的信息，请访问 Urovo 开发者页面。

示例代码

以下是 flutter_urovo_pos_printer_plugin 的完整示例代码：

import 'dart:io';
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:flutter_urovo_pos_printer_plugin/flutter_urovo_pos_printer_plugin.dart';
import 'package:path_provider/path_provider.dart';
import 'package:image/image.dart' as img;

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

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  final _flutterUrovoPosPrinterPlugin = FlutterUrovoPosPrinterPlugin();
  String status = "";

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // 初始化平台状态
  Future<void> initPlatformState() async {
    String platformVersion;
    try {
      platformVersion = await _flutterUrovoPosPrinterPlugin.getPlatformVersion() ?? 'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    if (!mounted) return;

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin Example App'),
        ),
        body: Column(
          children: [
            // 显示平台版本
            Center(
              child: Text('Running on: $_platformVersion\n'),
            ),
            Center(
              child: Text('Status: $status\n'),
            ),
            // 初始化打印
            OutlinedButton(
              onPressed: () async {
                bool print = await _flutterUrovoPosPrinterPlugin.initPrinter() ?? false;
                debugPrint('--------------------Print ready');
                print
                    ? debugPrint('Print ready')
                    : debugPrint('Print not found');
                setState(() {
                  status = print ? 'Print ready' : 'Print not found';
                });
              },
              child: const Text('Print Initialize'),
            ),
            // 打印测试页
            OutlinedButton(
              onPressed: () async {
                bool print = await _flutterUrovoPosPrinterPlugin.printTest() ?? false;
                debugPrint('--------------------');
                print
                    ? debugPrint('Print ready')
                    : debugPrint('Print not found');
                setState(() {
                  status = print ? 'Print ready' : 'Print not found';
                });
              },
              child: const Text('Print Test Page'),
            ),
            // 获取打印状态
            OutlinedButton(
              onPressed: () async {
                var state = await _flutterUrovoPosPrinterPlugin.getStatus();
                debugPrint('--------Get Status------------');
                debugPrint('Print Status=$state');
                setState(() {
                  status = 'Print Status: $state';
                });
              },
              child: const Text('Get Status'),
            ),
            // 设置打印页面
            OutlinedButton(
              onPressed: () async {
                bool state = await _flutterUrovoPosPrinterPlugin.setupPage(height: 348, width: -1) ?? false;
                debugPrint('--------Setup page------------');
                state
                    ? debugPrint('Print Setup page')
                    : debugPrint('Print not found');
                setState(() {
                  status = state ? 'Print Setup page' : 'Print not found';
                });
              },
              child: const Text('Set Up Page'),
            ),
            // 绘制直线
            OutlinedButton(
              onPressed: () async {
                await _flutterUrovoPosPrinterPlugin.setupPage(height: 348, width: -1);
                debugPrint('--------drawline------------');
                _flutterUrovoPosPrinterPlugin.drawLine(
                    x0: 30, y0: 20, x1: 10, y1: 30, lineWidth: 89);
                String respond = await _flutterUrovoPosPrinterPlugin.printPage(rotate: 0) ?? '';
                setState(() {
                  status = 'draw line ok';
                });
              },
              child: const Text('Draw Line'),
            ),
            // 清理资源
            OutlinedButton(
              onPressed: () async {
                bool state = await _flutterUrovoPosPrinterPlugin.dispose() ?? false;
                debugPrint('-------dispose------------');
                state
                    ? debugPrint('Print Status')
                    : debugPrint('Print not found');
                setState(() {
                  status = state ? 'Print Status' : 'Print not found';
                });
              },
              child: const Text('Dispose'),
            ),
            // 前进
            OutlinedButton(
              onPressed: () async {
                debugPrint('-------forward------------');
              },
              child: const Text('Forward'),
            ),
            // 绘制文本
            OutlinedButton(
              onPressed: () async {
                await _flutterUrovoPosPrinterPlugin.setupPage(height: 384, width: -1);
                await _flutterUrovoPosPrinterPlugin.drawText(
                    data: "Hello\nHi",
                    x: 200,
                    y: 200,
                    fontName: "simsun",
                    fontSize: 24,
                    isBold: true,
                    isItalic: false,
                    rotate: 0);
                String respond = await _flutterUrovoPosPrinterPlugin.printPage(rotate: 0) ?? '';
                debugPrint('-------drawText------------');
                setState(() {
                  status = 'draw text ok';
                });
              },
              child: const Text('Draw Text'),
            ),
            // 绘制位图
            OutlinedButton(
              onPressed: () async {
                final image = await getImageFile('assets/image/icon_flutter.png');
                final resImage = await _flutterUrovoPosPrinterPlugin.drawBitmap(
                    image: image.path, xDest: 100, yDest: 100);
                debugPrint(resImage.toString());
                String respond = await _flutterUrovoPosPrinterPlugin.printPage(rotate: 0) ?? '';
                debugPrint('-------Draw Bitmap------------');
                setState(() {
                  status = 'draw bitmap ok';
                });
              },
              child: const Text('Draw Bitmap'),
            ),
          ],
        ),
      ),
    );
  }

  Future<File> getImageFile(String path) async {
    final byteData = await rootBundle.load(path);

    final file = await File('${(await getTemporaryDirectory()).path}/$path').create(recursive: true);
    await file.writeAsBytes(byteData.buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));

    return file;
  }

  static Future<int?> getBitmap(ByteData imageBytes) async {
    List<int> values = imageBytes.buffer.asUint8List();
    img.Image? photo;
    photo = img.decodeImage(values);
    int pixel = photo!.getPixel(5, 0);
    return pixel;
  }
}

功能说明

  1. 初始化打印
    使用 initPrinter() 方法初始化打印机。

  2. 打印测试页
    使用 printTest() 方法打印测试页。

  3. 获取打印状态
    使用 getStatus() 方法获取打印机状态。

  4. 设置打印页面
    使用 setupPage() 方法设置打印页面的尺寸。

  5. 绘制直线
    使用 drawLine() 方法在页面上绘制直线。

  6. 绘制文本
    使用 drawText() 方法在页面上绘制文本。

  7. 绘制位图
    使用 drawBitmap() 方法在页面上绘制位图。

  8. 清理资源
    使用 dispose() 方法释放资源。

注意事项

  • 确保设备已连接并支持 Urovo 打印机。
  • 确保插件已正确安装，并在 pubspec.yaml 中添加依赖：
    dependencies:
  flutter_urovo_pos_printer_plugin: ^1.0.0

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


flutter_urovo_pos_printer_plugin 是一个用于控制UROVO POS打印机的Flutter插件。该插件允许开发者通过Flutter应用程序与UROVO POS打印机进行通信，执行打印任务。以下是如何使用该插件的基本指南。

1. 添加依赖

首先，你需要在 pubspec.yaml 文件中添加 flutter_urovo_pos_printer_plugin 作为依赖项。

dependencies:
  flutter:
    sdk: flutter
  flutter_urovo_pos_printer_plugin: ^1.0.0  # 请使用最新版本

然后，运行 flutter pub get 来获取依赖。

2. 导入库

在你的Dart文件中导入插件：

import 'package:flutter_urovo_pos_printer_plugin/flutter_urovo_pos_printer_plugin.dart';

3. 初始化插件

在使用插件之前，建议先进行初始化操作。

Future<void> initPrinter() async {
  try {
    await FlutterUrovoPosPrinterPlugin.initPrinter();
    print("Printer initialized successfully");
  } catch (e) {
    print("Failed to initialize printer: $e");
  }
}

4. 连接打印机

通常，UROVO POS打印机可以通过蓝牙或Wi-Fi连接。你可以使用以下方法来连接打印机。

Future<void> connectPrinter(String address) async {
  try {
    await FlutterUrovoPosPrinterPlugin.connectPrinter(address);
    print("Printer connected successfully");
  } catch (e) {
    print("Failed to connect printer: $e");
  }
}

5. 打印文本

连接打印机后，你可以发送打印任务。以下是一个打印文本的示例：

Future<void> printText(String text) async {
  try {
    await FlutterUrovoPosPrinterPlugin.printText(text);
    print("Text printed successfully");
  } catch (e) {
    print("Failed to print text: $e");
  }
}

6. 打印条码

你还可以打印条码：

Future<void> printBarcode(String barcodeData, int barcodeType) async {
  try {
    await FlutterUrovoPosPrinterPlugin.printBarcode(barcodeData, barcodeType);
    print("Barcode printed successfully");
  } catch (e) {
    print("Failed to print barcode: $e");
  }
}

7. 断开连接

完成打印任务后，记得断开与打印机的连接。

Future<void> disconnectPrinter() async {
  try {
    await FlutterUrovoPosPrinterPlugin.disconnectPrinter();
    print("Printer disconnected successfully");
  } catch (e) {
    print("Failed to disconnect printer: $e");
  }
}

8. 处理错误

在实际使用中，可能会遇到各种错误，如连接失败、打印失败等。建议在使用时添加适当的错误处理逻辑。

9. 示例代码

以下是一个完整的示例，展示了如何初始化、连接、打印和断开连接：

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

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

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

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

class _PrinterExampleState extends State<PrinterExample> {
  [@override](/user/override)
  void initState() {
    super.initState();
    initPrinter();
  }

  Future<void> initPrinter() async {
    try {
      await FlutterUrovoPosPrinterPlugin.initPrinter();
      print("Printer initialized successfully");
    } catch (e) {
      print("Failed to initialize printer: $e");
    }
  }

  Future<void> connectPrinter(String address) async {
    try {
      await FlutterUrovoPosPrinterPlugin.connectPrinter(address);
      print("Printer connected successfully");
    } catch (e) {
      print("Failed to connect printer: $e");
    }
  }

  Future<void> printText(String text) async {
    try {
      await FlutterUrovoPosPrinterPlugin.printText(text);
      print("Text printed successfully");
    } catch (e) {
      print("Failed to print text: $e");
    }
  }

  Future<void> disconnectPrinter() async {
    try {
      await FlutterUrovoPosPrinterPlugin.disconnectPrinter();
      print("Printer disconnected successfully");
    } catch (e) {
      print("Failed to disconnect printer: $e");
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('UROVO POS Printer Example'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            ElevatedButton(
              onPressed: () => connectPrinter("打印机地址"),
              child: Text('Connect Printer'),
            ),
            ElevatedButton(
              onPressed: () => printText("Hello, UROVO!"),
              child: Text('Print Text'),
            ),
            ElevatedButton(
              onPressed: disconnectPrinter,
              child: Text('Disconnect Printer'),
            ),
          ],
        ),
      ),
    );
  }
}
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