quick_usb 0.1.0+2

A cross-platform USB plugin for Flutter

example/lib/main.dart

import 'dart:convert';
import 'dart:typed_data';

import 'package:convert/convert.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:quick_usb/quick_usb.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: _buildColumn(),
      ),
    );
  }

  Widget _buildColumn() {
    return Column(
      children: [
        _init_exit(),
        _getDeviceList(),
        _has_request(),
        _open_close(),
        _get_set_configuration(),
        _claim_release_interface(),
        _bulk_transfer(),
      ],
    );
  }

  Widget _init_exit() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        RaisedButton(
          child: Text('init'),
          onPressed: () async {
            var init = await QuickUsb.init();
            print('init $init');
          },
        ),
        RaisedButton(
          child: Text('exit'),
          onPressed: () async {
            await QuickUsb.exit();
            print('exit');
          },
        ),
      ],
    );
  }

  List<UsbDevice> _deviceList;

  Widget _getDeviceList() {
    return RaisedButton(
      child: Text('getDeviceList'),
      onPressed: () async {
        _deviceList = await QuickUsb.getDeviceList();
        print('deviceList $_deviceList');
      },
    );
  }

  Widget _has_request() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        RaisedButton(
          child: Text('hasPermission'),
          onPressed: () async {
            var hasPermission = await QuickUsb.hasPermission(_deviceList.first);
            print('hasPermission $hasPermission');
          },
        ),
        RaisedButton(
          child: Text('requestPermission'),
          onPressed: () async {
            await QuickUsb.requestPermission(_deviceList.first);
            print('requestPermission');
          },
        ),
      ],
    );
  }

  Widget _open_close() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        RaisedButton(
          child: Text('openDevice'),
          onPressed: () async {
            var openDevice = await QuickUsb.openDevice(_deviceList
                .firstWhere((element) => element.vendorId == 0x1203));
            print('openDevice $openDevice');
          },
        ),
        RaisedButton(
          child: Text('closeDevice'),
          onPressed: () async {
            await QuickUsb.closeDevice();
            print('closeDevice');
          },
        ),
      ],
    );
  }

  UsbConfiguration _configuration;

  Widget _get_set_configuration() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        RaisedButton(
          child: Text('getConfiguration'),
          onPressed: () async {
            _configuration = await QuickUsb.getConfiguration(0);
            print('getConfiguration $_configuration');
          },
        ),
        RaisedButton(
          child: Text('setConfiguration'),
          onPressed: () async {
            var setConfiguration =
            await QuickUsb.setConfiguration(_configuration);
            print('setConfiguration $setConfiguration');
          },
        ),
      ],
    );
  }

  Widget _claim_release_interface() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        RaisedButton(
          child: Text('claimInterface'),
          onPressed: () async {
            var claimInterface =
            await QuickUsb.claimInterface(_configuration.interfaces[0]);
            print('claimInterface $claimInterface');
          },
        ),
        RaisedButton(
          child: Text('releaseInterface'),
          onPressed: () async {
            var releaseInterface =
                await QuickUsb.releaseInterface(_configuration.interfaces[0]);
            print('releaseInterface $releaseInterface');
          },
        ),
      ],
    );
  }

  UsbEndpoint _endpointOut;

  UsbEndpoint get endpointOut => _endpointOut;

  Widget _bulk_transfer() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: [
        RaisedButton(
          child: Text('bulkTransferIn'),
          onPressed: () async {
            var data = Uint8List.fromList([27, 33, 83]);
            var endpointOut = _configuration.interfaces[0].endpoints
                .firstWhere((e) => e.direction == UsbEndpoint.DIRECTION_OUT);
            var bulkTransferOut =
                await QuickUsb.bulkTransferOut(endpointOut, data);
            print('bulkTransferOut $bulkTransferOut');

            await Future.delayed(Duration(milliseconds: 150));
            var endpointIn = _configuration.interfaces[0].endpoints
                .firstWhere((e) => e.direction == UsbEndpoint.DIRECTION_IN);
            var bulkTransferIn =
                await QuickUsb.bulkTransferIn(endpointIn, 1024);
            print('bulkTransferIn ${hex.encode(bulkTransferIn)}');
          },
        ),
        RaisedButton(
          child: Text('bulkTransferOut'),
          onPressed: () async {
            _endpointOut = _configuration.interfaces[0].endpoints
                .firstWhere((e) => e.direction == UsbEndpoint.DIRECTION_OUT);

            var width = 1100;
            var height = 788;
            ByteData imageBytes = await rootBundle.load('images/b1.bmp');
            var imageData = imageBytes.buffer.asUint8List();

            await send(Uint8List.fromList(
                utf8.encode('DOWNLOAD F,"TEST.BMP",${imageData.length},')));
            await send(imageData);
            await send(Uint8List.fromList(
                utf8.encode('SIZE $width dot,${height + 50} dot\n')));
            await send(Uint8List.fromList(utf8.encode('CLS\n')));
            await send(
                Uint8List.fromList(utf8.encode('PUTBMP 0,50,"TEST.BMP"\n')));
            await send(Uint8List.fromList(utf8.encode('EOJ\n')));
            await send(Uint8List.fromList(utf8.encode('PRINT 1\n')));
            await send(Uint8List.fromList(utf8.encode('EOP\n')));
          },
        ),
      ],
    );
  }

  Future send(Uint8List data) async {
    var bulkTransferOut = await QuickUsb.bulkTransferOut(endpointOut, data);
    print('bulkTransferOut $bulkTransferOut');
  }
}