flutter_pos_printer_platform 1.3.0 
flutter_pos_printer_platform: ^1.3.0 copied to clipboard
sersoluciones.comA flutter plugin that prints esc commands to printers in different platforms such as android, ios, windows and different interfaces Bluetooth and BLE, TCP and USB
import 'dart:async';
import 'dart:developer';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_pos_printer_platform/esc_pos_utils_platform/esc_pos_utils_platform.dart';
import 'package:flutter_pos_printer_platform/flutter_pos_printer_platform.dart';
import 'package:image/image.dart' as img;
import 'package:dart_ping_ios/dart_ping_ios.dart';
import 'image_utils.dart';
void main() {
// Register DartPingIOS
if (Platform.isIOS) {
DartPingIOS.register();
}
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
// Printer Type [bluetooth, usb, network]
var defaultPrinterType = PrinterType.bluetooth;
var _isBle = false;
var _reconnect = false;
var _isConnected = false;
var printerManager = PrinterManager.instance;
var devices = <BluetoothPrinter>[];
StreamSubscription<PrinterDevice>? _subscription;
StreamSubscription<BTStatus>? _subscriptionBtStatus;
StreamSubscription<USBStatus>? _subscriptionUsbStatus;
StreamSubscription<TCPStatus>? _subscriptionTCPStatus;
BTStatus _currentStatus = BTStatus.none;
// ignore: unused_field
TCPStatus _currentTCPStatus = TCPStatus.none;
// _currentUsbStatus is only supports on Android
// ignore: unused_field
USBStatus _currentUsbStatus = USBStatus.none;
List<int>? pendingTask;
String _ipAddress = '';
String _port = '9100';
final _ipController = TextEditingController();
final _portController = TextEditingController();
BluetoothPrinter? selectedPrinter;
@override
void initState() {
if (Platform.isWindows) defaultPrinterType = PrinterType.usb;
super.initState();
_portController.text = _port;
_scan();
// subscription to listen change status of bluetooth connection
_subscriptionBtStatus = PrinterManager.instance.stateBluetooth.listen((status) {
log(' ----------------- status bt $status ------------------ ');
_currentStatus = status;
if (status == BTStatus.connected) {
setState(() {
_isConnected = true;
});
}
if (status == BTStatus.none) {
setState(() {
_isConnected = false;
});
}
if (status == BTStatus.connected && pendingTask != null) {
if (Platform.isAndroid) {
Future.delayed(const Duration(milliseconds: 1000), () {
PrinterManager.instance.send(type: PrinterType.bluetooth, bytes: pendingTask!);
pendingTask = null;
});
} else if (Platform.isIOS) {
PrinterManager.instance.send(type: PrinterType.bluetooth, bytes: pendingTask!);
pendingTask = null;
}
}
});
// PrinterManager.instance.stateUSB is only supports on Android
_subscriptionUsbStatus = PrinterManager.instance.stateUSB.listen((status) {
log(' ----------------- status usb $status ------------------ ');
_currentUsbStatus = status;
if (Platform.isAndroid) {
if (status == USBStatus.connected && pendingTask != null) {
Future.delayed(const Duration(milliseconds: 1000), () {
PrinterManager.instance.send(type: PrinterType.usb, bytes: pendingTask!);
pendingTask = null;
});
}
}
});
// PrinterManager.instance.stateUSB is only supports on Android
_subscriptionTCPStatus = PrinterManager.instance.stateTCP.listen((status) {
log(' ----------------- status tcp $status ------------------ ');
_currentTCPStatus = status;
});
}
@override
void dispose() {
_subscription?.cancel();
_subscriptionBtStatus?.cancel();
_subscriptionUsbStatus?.cancel();
_subscriptionTCPStatus?.cancel();
_portController.dispose();
_ipController.dispose();
super.dispose();
}
// method to scan devices according PrinterType
void _scan() {
devices.clear();
_subscription = printerManager.discovery(type: defaultPrinterType, isBle: _isBle).listen((device) {
devices.add(BluetoothPrinter(
deviceName: device.name,
address: device.address,
isBle: _isBle,
vendorId: device.vendorId,
productId: device.productId,
typePrinter: defaultPrinterType,
));
setState(() {});
});
}
void setPort(String value) {
if (value.isEmpty) value = '9100';
_port = value;
var device = BluetoothPrinter(
deviceName: value,
address: _ipAddress,
port: _port,
typePrinter: PrinterType.network,
state: false,
);
selectDevice(device);
}
void setIpAddress(String value) {
_ipAddress = value;
var device = BluetoothPrinter(
deviceName: value,
address: _ipAddress,
port: _port,
typePrinter: PrinterType.network,
state: false,
);
selectDevice(device);
}
void selectDevice(BluetoothPrinter device) async {
if (selectedPrinter != null) {
if ((device.address != selectedPrinter!.address) || (device.typePrinter == PrinterType.usb && selectedPrinter!.vendorId != device.vendorId)) {
await PrinterManager.instance.disconnect(type: selectedPrinter!.typePrinter);
}
}
selectedPrinter = device;
setState(() {});
}
Future _printReceiveTest() async {
List<int> bytes = [];
// Xprinter XP-N160I
final profile = await CapabilityProfile.load(name: 'XP-N160I');
// PaperSize.mm80 or PaperSize.mm58
final generator = Generator(PaperSize.mm58, profile);
bytes += generator.setGlobalCodeTable('CP1252');
bytes += generator.text('Test Print', styles: const PosStyles(align: PosAlign.left));
bytes += generator.text('Product 1');
bytes += generator.text('Product 2');
// bytes += generator.text('￥1,990', containsChinese: true, styles: const PosStyles(align: PosAlign.left));
// bytes += generator.emptyLines(1);
// sum width total column must be 12
bytes += generator.row([
PosColumn(width: 8, text: 'Lemon lime export quality per pound x 5 units', styles: const PosStyles(align: PosAlign.left, codeTable: 'CP1252')),
PosColumn(width: 4, text: 'USD 2.00', styles: const PosStyles(align: PosAlign.right, codeTable: 'CP1252')),
]);
final ByteData data = await rootBundle.load('assets/ic_launcher.png');
if (data.lengthInBytes > 0) {
final Uint8List imageBytes = data.buffer.asUint8List();
// decode the bytes into an image
final decodedImage = img.decodeImage(imageBytes)!;
// Create a black bottom layer
// Resize the image to a 130x? thumbnail (maintaining the aspect ratio).
img.Image thumbnail = img.copyResize(decodedImage, height: 130);
// creates a copy of the original image with set dimensions
img.Image originalImg = img.copyResize(decodedImage, width: 380, height: 130);
// fills the original image with a white background
img.fill(originalImg, color: img.ColorRgb8(255, 255, 255));
var padding = (originalImg.width - thumbnail.width) / 2;
//insert the image inside the frame and center it
drawImage(originalImg, thumbnail, dstX: padding.toInt());
// convert image to grayscale
var grayscaleImage = img.grayscale(originalImg);
bytes += generator.feed(1);
// bytes += generator.imageRaster(img.decodeImage(imageBytes)!, align: PosAlign.center);
bytes += generator.imageRaster(grayscaleImage, align: PosAlign.center);
bytes += generator.feed(1);
}
// // Chinese characters
bytes += generator.row([
PosColumn(width: 8, text: '豚肉・木耳と玉子炒め弁当', styles: const PosStyles(align: PosAlign.left), containsChinese: true),
PosColumn(width: 4, text: '￥1,990', styles: const PosStyles(align: PosAlign.right), containsChinese: true),
]);
_printEscPos(bytes, generator);
}
/// print ticket
void _printEscPos(List<int> bytes, Generator generator) async {
var connectedTCP = false;
if (selectedPrinter == null) return;
var bluetoothPrinter = selectedPrinter!;
switch (bluetoothPrinter.typePrinter) {
case PrinterType.usb:
bytes += generator.feed(2);
bytes += generator.cut();
await printerManager.connect(
type: bluetoothPrinter.typePrinter,
model: UsbPrinterInput(name: bluetoothPrinter.deviceName, productId: bluetoothPrinter.productId, vendorId: bluetoothPrinter.vendorId));
pendingTask = null;
break;
case PrinterType.bluetooth:
bytes += generator.cut();
await printerManager.connect(
type: bluetoothPrinter.typePrinter,
model: BluetoothPrinterInput(
name: bluetoothPrinter.deviceName,
address: bluetoothPrinter.address!,
isBle: bluetoothPrinter.isBle ?? false,
autoConnect: _reconnect));
pendingTask = null;
if (Platform.isAndroid) pendingTask = bytes;
break;
case PrinterType.network:
bytes += generator.feed(2);
bytes += generator.cut();
connectedTCP = await printerManager.connect(type: bluetoothPrinter.typePrinter, model: TcpPrinterInput(ipAddress: bluetoothPrinter.address!));
if (!connectedTCP) print(' --- please review your connection ---');
break;
default:
}
if (bluetoothPrinter.typePrinter == PrinterType.bluetooth && Platform.isAndroid) {
if (_currentStatus == BTStatus.connected) {
printerManager.send(type: bluetoothPrinter.typePrinter, bytes: bytes);
pendingTask = null;
}
} else {
printerManager.send(type: bluetoothPrinter.typePrinter, bytes: bytes);
}
}
// conectar dispositivo
_connectDevice() async {
_isConnected = false;
if (selectedPrinter == null) return;
switch (selectedPrinter!.typePrinter) {
case PrinterType.usb:
await printerManager.connect(
type: selectedPrinter!.typePrinter,
model: UsbPrinterInput(name: selectedPrinter!.deviceName, productId: selectedPrinter!.productId, vendorId: selectedPrinter!.vendorId));
_isConnected = true;
break;
case PrinterType.bluetooth:
await printerManager.connect(
type: selectedPrinter!.typePrinter,
model: BluetoothPrinterInput(
name: selectedPrinter!.deviceName,
address: selectedPrinter!.address!,
isBle: selectedPrinter!.isBle ?? false,
autoConnect: _reconnect));
break;
case PrinterType.network:
await printerManager.connect(type: selectedPrinter!.typePrinter, model: TcpPrinterInput(ipAddress: selectedPrinter!.address!));
_isConnected = true;
break;
default:
}
setState(() {});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Flutter Pos Plugin Platform example app'),
),
body: Center(
child: Container(
height: double.infinity,
constraints: const BoxConstraints(maxWidth: 400),
child: SingleChildScrollView(
padding: EdgeInsets.zero,
child: Column(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Expanded(
child: ElevatedButton(
onPressed: selectedPrinter == null || _isConnected
? null
: () {
_connectDevice();
},
child: const Text("Connect", textAlign: TextAlign.center),
),
),
const SizedBox(width: 8),
Expanded(
child: ElevatedButton(
onPressed: selectedPrinter == null || !_isConnected
? null
: () {
if (selectedPrinter != null) printerManager.disconnect(type: selectedPrinter!.typePrinter);
setState(() {
_isConnected = false;
});
},
child: const Text("Disconnect", textAlign: TextAlign.center),
),
),
],
),
),
DropdownButtonFormField<PrinterType>(
value: defaultPrinterType,
decoration: const InputDecoration(
prefixIcon: Icon(
Icons.print,
size: 24,
),
labelText: "Type Printer Device",
labelStyle: TextStyle(fontSize: 18.0),
focusedBorder: InputBorder.none,
enabledBorder: InputBorder.none,
),
items: <DropdownMenuItem<PrinterType>>[
if (Platform.isAndroid || Platform.isIOS)
const DropdownMenuItem(
value: PrinterType.bluetooth,
child: Text("bluetooth"),
),
if (Platform.isAndroid || Platform.isWindows)
const DropdownMenuItem(
value: PrinterType.usb,
child: Text("usb"),
),
const DropdownMenuItem(
value: PrinterType.network,
child: Text("Wifi"),
),
],
onChanged: (PrinterType? value) {
setState(() {
if (value != null) {
setState(() {
defaultPrinterType = value;
selectedPrinter = null;
_isBle = false;
_isConnected = false;
_scan();
});
}
});
},
),
Visibility(
visible: defaultPrinterType == PrinterType.bluetooth && Platform.isAndroid,
child: SwitchListTile.adaptive(
contentPadding: const EdgeInsets.only(bottom: 20.0, left: 20),
title: const Text(
"This device supports ble (low energy)",
textAlign: TextAlign.start,
style: TextStyle(fontSize: 19.0),
),
value: _isBle,
onChanged: (bool? value) {
setState(() {
_isBle = value ?? false;
_isConnected = false;
selectedPrinter = null;
_scan();
});
},
),
),
Visibility(
visible: defaultPrinterType == PrinterType.bluetooth && Platform.isAndroid,
child: SwitchListTile.adaptive(
contentPadding: const EdgeInsets.only(bottom: 20.0, left: 20),
title: const Text(
"reconnect",
textAlign: TextAlign.start,
style: TextStyle(fontSize: 19.0),
),
value: _reconnect,
onChanged: (bool? value) {
setState(() {
_reconnect = value ?? false;
});
},
),
),
Column(
children: devices
.map(
(device) => ListTile(
title: Text('${device.deviceName}'),
subtitle: Platform.isAndroid && defaultPrinterType == PrinterType.usb
? null
: Visibility(visible: !Platform.isWindows, child: Text("${device.address}")),
onTap: () {
// do something
selectDevice(device);
},
leading: selectedPrinter != null &&
((device.typePrinter == PrinterType.usb && Platform.isWindows
? device.deviceName == selectedPrinter!.deviceName
: device.vendorId != null && selectedPrinter!.vendorId == device.vendorId) ||
(device.address != null && selectedPrinter!.address == device.address))
? const Icon(
Icons.check,
color: Colors.green,
)
: null,
trailing: OutlinedButton(
onPressed: selectedPrinter == null || device.deviceName != selectedPrinter?.deviceName
? null
: () async {
_printReceiveTest();
},
child: const Padding(
padding: EdgeInsets.symmetric(vertical: 2, horizontal: 20),
child: Text("Print test ticket", textAlign: TextAlign.center),
),
),
),
)
.toList()),
Visibility(
visible: defaultPrinterType == PrinterType.network && Platform.isWindows,
child: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: TextFormField(
controller: _ipController,
keyboardType: const TextInputType.numberWithOptions(signed: true),
decoration: const InputDecoration(
label: Text("Ip Address"),
prefixIcon: Icon(Icons.wifi, size: 24),
),
onChanged: setIpAddress,
),
),
),
Visibility(
visible: defaultPrinterType == PrinterType.network && Platform.isWindows,
child: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: TextFormField(
controller: _portController,
keyboardType: const TextInputType.numberWithOptions(signed: true),
decoration: const InputDecoration(
label: Text("Port"),
prefixIcon: Icon(Icons.numbers_outlined, size: 24),
),
onChanged: setPort,
),
),
),
Visibility(
visible: defaultPrinterType == PrinterType.network && Platform.isWindows,
child: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: OutlinedButton(
onPressed: () async {
if (_ipController.text.isNotEmpty) setIpAddress(_ipController.text);
_printReceiveTest();
},
child: const Padding(
padding: EdgeInsets.symmetric(vertical: 4, horizontal: 50),
child: Text("Print test ticket", textAlign: TextAlign.center),
),
),
),
)
],
),
),
),
),
),
);
}
}
class BluetoothPrinter {
int? id;
String? deviceName;
String? address;
String? port;
String? vendorId;
String? productId;
bool? isBle;
PrinterType typePrinter;
bool? state;
BluetoothPrinter(
{this.deviceName,
this.address,
this.port,
this.state,
this.vendorId,
this.productId,
this.typePrinter = PrinterType.bluetooth,
this.isBle = false});
}Metadata
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Metadata
A flutter plugin that prints esc commands to printers in different platforms such as android, ios, windows and different interfaces Bluetooth and BLE, TCP and USB
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
dart_ping, enum_to_string, flutter, gbk_codec, hex, image, network_info_plus, ping_discover_network_forked, rxdart
