ciontek_sdk_flutter 0.0.2

A Flutter plugin for Ciontek SDK, providing functionalities to interact with Ciontek devices.

example/lib/main.dart

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

import 'package:flutter/services.dart';
import 'package:ciontek_sdk_flutter/ciontek_sdk_flutter.dart';

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 _ciontekSdkFlutterPlugin = CiontekSdkFlutter();

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

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion =
          await _ciontekSdkFlutterPlugin.getPlatformVersion() ??
          'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

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

  Future<void> connectPrinter() async {
    String? result;
    try {
      result = await _ciontekSdkFlutterPlugin.connectPrinter();
    } on PlatformException catch (e) {
      result = "Failed to connect printer: '${e.message}'.";
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = result ?? 'Unknown connection result';
    });
  }

  void _printTestReceipt(BuildContext context) async {
    // Initialize printer
    await _ciontekSdkFlutterPlugin.printInit();

    // Set font (example values: fontType=1, fontSize=0, fontStyle=0)
    await _ciontekSdkFlutterPlugin.setPrinterFont(16, 16, 0x33);
    await _ciontekSdkFlutterPlugin.setPrinterFont(24, 24, 0x00);

    // Set mode (example value: 0)
    await _ciontekSdkFlutterPlugin.prnSetMode(0);

    // Set gray level (example value: 2)
    await _ciontekSdkFlutterPlugin.prnSetGray(5);

    // Check printer status before printing
    int? status = await _ciontekSdkFlutterPlugin.printCheckStatus();

    if (!mounted) return; // Ensure widget is still in the tree

    if (status == 0) {
      // Printer is ready
      await _ciontekSdkFlutterPlugin.prnStr("=== TEST RECEIPT ===\n");
      await _ciontekSdkFlutterPlugin.prnStr("Item 1      \$10.00\n");
      await _ciontekSdkFlutterPlugin.prnStr("Item 2      \$5.00\n");
      await _ciontekSdkFlutterPlugin.prnStr("-------------------\n");
      await _ciontekSdkFlutterPlugin.prnStr("TOTAL:      \$15.00\n");
      await _ciontekSdkFlutterPlugin.prnStr("Thank you for your purchase!\n");
      await _ciontekSdkFlutterPlugin.prnStr("Visit us again!\n");
      await _ciontekSdkFlutterPlugin.prnStr("             \n");
      await _ciontekSdkFlutterPlugin.prnStr("             \n");
      await _ciontekSdkFlutterPlugin.prnStr("             \n");
      await _ciontekSdkFlutterPlugin.prnStr("\n\n\n\n\n\n");
      await _ciontekSdkFlutterPlugin.prnStart();
      await _ciontekSdkFlutterPlugin.prnFeedPaper(
        300,
      ); // Feed paper after printing
    } else {
      // Handle printer error
      String errorMsg;
      switch (status) {
        case -1:
          errorMsg = "Printer needs paper.";
          break;
        case -2:
          errorMsg = "Printer high temperature.";
          break;
        case -3:
          errorMsg = "Low battery voltage.";
          break;
        default:
          errorMsg = "Unknown printer error.";
      }
      // Use addPostFrameCallback to avoid async gap issues
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (mounted) {
          ScaffoldMessenger.of(
            context,
          ).showSnackBar(SnackBar(content: Text(errorMsg)));
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Plugin example app')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text('Running on: $_platformVersion\n'),
              ElevatedButton(
                onPressed: connectPrinter,
                child: const Text('Connect Printer'),
              ),
              ElevatedButton(
                onPressed: () {
                  _printTestReceipt(context);
                },
                child: const Text('Print Test Receipt'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}