Flutter热敏打印机控制插件tp808_printer的使用

Flutter热敏打印机控制插件tp808_printer的使用

在Flutter应用开发中，有时我们需要控制热敏打印机进行打印操作。tp808_printer 是一个用于控制热敏打印机的Flutter插件，支持多种打印功能，例如文本打印、二维码打印、条形码打印等。

插件安装

首先，在 pubspec.yaml 文件中添加 tp808_printer 插件依赖：

dependencies:
  tp808_printer: ^1.0.0

然后运行以下命令以安装插件：

flutter pub get

初始化打印机

在使用插件之前，需要初始化打印机。通常需要连接到蓝牙设备或USB设备。

import 'package:flutter/material.dart';
import 'package:tp808_printer/tp808_printer.dart';

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

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

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

class _PrintPageState extends State<PrintPage> {
  bool _isPrinterConnected = false;

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

  Future<void> _initializePrinter() async {
    try {
      // 尝试连接打印机
      await TP808Printer.connect();
      setState(() {
        _isPrinterConnected = true;
      });
    } catch (e) {
      print("Printer initialization failed: $e");
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('热敏打印机控制'),
      ),
      body: Center(
        child: _isPrinterConnected
            ? Text('打印机已连接')
            : ElevatedButton(
                onPressed: () => _initializePrinter(),
                child: Text('连接打印机'),
              ),
      ),
    );
  }
}

打印文本

成功连接打印机后，可以使用 TP808Printer.printText() 方法打印文本。

Future<void> _printText() async {
  try {
    await TP808Printer.printText(
      text: "Hello, World!\nThis is a test print.",
      align: "center", // 可选参数：left, center, right
      fontSize: 2, // 可选参数：1-6，字体大小
      bold: true, // 可选参数：是否加粗
    );
    print("Text printed successfully.");
  } catch (e) {
    print("Failed to print text: $e");
  }
}

打印二维码

要打印二维码，可以使用 TP808Printer.printQRCode() 方法。

Future<void> _printQRCode() async {
  try {
    await TP808Printer.printQRCode(
      data: "https://example.com",
      size: 8, // 二维码尺寸
      align: "center", // 对齐方式
    );
    print("QR Code printed successfully.");
  } catch (e) {
    print("Failed to print QR code: $e");
  }
}

打印条形码

同样，条形码打印可以通过 TP808Printer.printBarcode() 方法实现。

Future<void> _printBarcode() async {
  try {
    await TP808Printer.printBarcode(
      data: "1234567890",
      symbology: "ean13", // 条形码类型
      width: 2, // 条形码宽度
      height: 100, // 条形码高度
      align: "center", // 对齐方式
    );
    print("Barcode printed successfully.");
  } catch (e) {
    print("Failed to print barcode: $e");
  }
}

打印完成后的断开连接

打印完成后，建议断开与打印机的连接以释放资源。

Future<void> _disconnectPrinter() async {
  try {
    await TP808Printer.disconnect();
    print("Printer disconnected successfully.");
  } catch (e) {
    print("Failed to disconnect printer: $e");
  }
}

完整示例代码

import 'package:flutter/material.dart';
import 'package:tp808_printer/tp808_printer.dart';

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

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

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

class _PrintPageState extends State<PrintPage> {
  bool _isPrinterConnected = false;

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

  Future<void> _initializePrinter() async {
    try {
      await TP808Printer.connect();
      setState(() {
        _isPrinterConnected = true;
      });
    } catch (e) {
      print("Printer initialization failed: $e");
    }
  }

  Future<void> _printText() async {
    try {
      await TP808Printer.printText(
        text: "Hello, World!\nThis is a test print.",
        align: "center",
        fontSize: 2,
        bold: true,
      );
      print("Text printed successfully.");
    } catch (e) {
      print("Failed to print text: $e");
    }
  }

  Future<void> _printQRCode() async {
    try {
      await TP808Printer.printQRCode(
        data: "https://example.com",
        size: 8,
        align: "center",
      );
      print("QR Code printed successfully.");
    } catch (e) {
      print("Failed to print QR code: $e");
    }
  }

  Future<void> _printBarcode() async {
    try {
      await TP808Printer.printBarcode(
        data: "1234567890",
        symbology: "ean13",
        width: 2,
        height: 100,
        align: "center",
      );
      print("Barcode printed successfully.");
    } catch (e) {
      print("Failed to print barcode: $e");
    }
  }

  Future<void> _disconnectPrinter() async {
    try {
      await TP808Printer.disconnect();
      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('热敏打印机控制'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: _isPrinterConnected ? _printText : null,
              child: Text('打印文本'),
            ),
            ElevatedButton(
              onPressed: _isPrinterConnected ? _printQRCode : null,
              child: Text('打印二维码'),
            ),
            ElevatedButton(
              onPressed: _isPrinterConnected ? _printBarcode : null,
              child: Text('打印条形码'),
            ),
            ElevatedButton(
              onPressed: _isPrinterConnected ? _disconnectPrinter : null,
              child: Text('断开连接'),
            ),
          ],
        ),
      ),
    );
  }
}