pt-e550w print example.

pt-e550w.dart

import 'dart:ui' as ui;

import 'package:another_brother/label_info.dart';
import 'package:another_brother/printer_info.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler_platform_interface/permission_handler_platform_interface.dart';
import 'package:qr_flutter/qr_flutter.dart';

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

class MyApp extends StatelessWidget {
  final controller = PageController(initialPage: 1);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Another Brother Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: PageView(children: const [
        WifiPrintPage(title: 'PT-E550W WiFi Sample'),
      ]),
    );
  }
}

class WifiPrintPage extends StatefulWidget {
  const WifiPrintPage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _WifiPrintPageState createState() => _WifiPrintPageState();
}

class _WifiPrintPageState extends State<WifiPrintPage> {
  bool _error = false;

  void print(BuildContext context) async {
    final PermissionHandlerPlatform _permissionHandler = PermissionHandlerPlatform.instance;
    final status = await _permissionHandler.requestPermissions([Permission.storage]);

    var printer = Printer();
    var printInfo = PrinterInfo();
    printInfo.printerModel = Model.PT_E550W;
    printInfo.printMode = PrintMode.FIT_TO_PAGE;
    printInfo.port = Port.NET;

    // Set the label type.
    printInfo.labelNameIndex = PT.ordinalFromID(PT.W24.getId());

    // Set the label size.
    await printer.setPrinterInfo(printInfo);
    List<NetPrinter> printers = await printer.getNetPrinters([Model.PT_E550W.getName()]);

    if (printers.isEmpty) {
      // Show a message if no printers are found.
      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
        content: Padding(
          padding: EdgeInsets.all(8.0),
          child: Text("No printers found on your network."),
        ),
      ));

      return;
    }

    // Get the IP Address from the first printer found.
    printInfo.ipAddress = printers.single.ipAddress;

    printer.setPrinterInfo(printInfo);

    QrValidationResult result = QrValidator.validate(data: "LABEL", version: QrVersions.auto, errorCorrectionLevel: QrErrorCorrectLevel.L);

    QrPainter painter = QrPainter.withQr(
      qr: result.qrCode!,
      color: Colors.black,
      emptyColor: Colors.white,
      gapless: false,
    );

    ui.Image qrImage = await painter.toImage(2048);

    if (await printer.startCommunication()) {
      for (int i = 0; i < 2; i++) {
        await printer.printImage(qrImage);
      }
    }

    await printer.endCommunication();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: const <Widget>[
            Padding(
              padding: EdgeInsets.all(8.0),
              child: Text(
                "Don't forget to grant permissions to your app in Settings.",
                textAlign: TextAlign.center,
              ),
            ),
            Image(image: AssetImage('assets/brother_hack.png'))
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () => print(context),
        tooltip: 'Print',
        child: const Icon(Icons.print),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}