bluetooth_thermal_printer

空安全
https://pub.dev/packages/esc_pos_utils_plus
空安全
https://pub.dev/packages/bluetooth_thermal_printer
两个配合, 还是无法打印图片, 结论: 打印机不支持,这个方式.
bluetooth_thermal_printer: ^0.0.6
esc_pos_utils: ^1.0.0

  1. import 'dart:async';
  3. import 'package:bluetooth_thermal_printer/bluetooth_thermal_printer.dart';
  4. import 'package:esc_pos_utils/esc_pos_utils.dart';
  5. import 'package:flutter/material.dart';
  7. void main() {
  8.   runApp(MyApp());
  9. }
  11. class MyApp extends StatefulWidget {
  12.   @override
  13.   _MyAppState createState() => _MyAppState();
  14. }
  16. class _MyAppState extends State<MyApp> {
  17.   @override
  18.   void initState() {
  19.     super.initState();
  20.   }
  22.   bool connected = false;
  23.   List availableBluetoothDevices = [];
  25.   Future<void> getBluetooth() async {
  26.     final List bluetooths = await BluetoothThermalPrinter.getBluetooths;
  27.     print("Print $bluetooths");
  28.     setState(() {
  29.       availableBluetoothDevices = bluetooths;
  30.     });
  31.   }
  33.   Future<void> setConnect(String mac) async {
  34.     final String result = await BluetoothThermalPrinter.connect(mac);
  35.     print("state conneected $result");
  36.     if (result == "true") {
  37.       setState(() {
  38.         connected = true;
  39.       });
  40.     }
  41.   }
  43.   Future<void> printTicket() async {
  44.     String isConnected = await BluetoothThermalPrinter.connectionStatus;
  45.     if (isConnected == "true") {
  46.       List<int> bytes = await getTicket();
  47.       final result = await BluetoothThermalPrinter.writeBytes(bytes);
  48.       print("Print $result");
  49.     } else {
  50.       //Hadnle Not Connected Senario
  51.     }
  52.   }
  54.   Future<void> printGraphics() async {
  55.     String isConnected = await BluetoothThermalPrinter.connectionStatus;
  56.     if (isConnected == "true") {
  57.       List<int> bytes = await getGraphicsTicket();
  58.       final result = await BluetoothThermalPrinter.writeBytes(bytes);
  59.       print("Print $result");
  60.     } else {
  61.       //Hadnle Not Connected Senario
  62.     }
  63.   }
  65.   Future<List<int>> getGraphicsTicket() async {
  66.     List<int> bytes = [];
  68.     CapabilityProfile profile = await CapabilityProfile.load();
  69.     final generator = Generator(PaperSize.mm80, profile);
  71.     // Print QR Code using native function
  72.     bytes += generator.qrcode('example.com');
  74.     bytes += generator.hr();
  76.     // Print Barcode using native function
  77.     final List<int> barData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 4];
  78.     bytes += generator.barcode(Barcode.upcA(barData));
  80.     bytes += generator.cut();
  82.     return bytes;
  83.   }
  85.   Future<List<int>> getTicket() async {
  86.     List<int> bytes = [];
  87.     CapabilityProfile profile = await CapabilityProfile.load();
  88.     final generator = Generator(PaperSize.mm80, profile);
  90.     // Print image
  91.     // final ByteData data = await rootBundle.load('assets/rabbit_black.jpg');
  92.     // final Uint8List bytes = data.buffer.asUint8List();
  93.     // final Image image = decodeImage(bytes);
  94.     // ticket.image(image);
  97.     bytes += generator.text(
  98.         "////=========================================================================================///",
  99.         styles: PosStyles(
  100.           align: PosAlign.center,
  101.           height: PosTextSize.size2,
  102.           width: PosTextSize.size2,
  103.         ),
  104.         linesAfter: 1);
  106.     bytes += generator.text(
  107.         "18th Main Road, 2nd Phase, J. P. Nagar, Bengaluru, Karnataka 560078",
  108.         styles: PosStyles(align: PosAlign.center));
  109.     bytes += generator.text('Tel: +919591708470',
  110.         styles: PosStyles(align: PosAlign.center));
  112.     bytes += generator.hr();
  113.     bytes += generator.row([
  114.       PosColumn(
  115.           text: 'No',
  116.           width: 1,
  117.           styles: PosStyles(align: PosAlign.left, bold: true)),
  118.       PosColumn(
  119.           text: 'Item',
  120.           width: 5,
  121.           styles: PosStyles(align: PosAlign.left, bold: true)),
  122.       PosColumn(
  123.           text: 'Price',
  124.           width: 2,
  125.           styles: PosStyles(align: PosAlign.center, bold: true)),
  126.       PosColumn(
  127.           text: 'Qty',
  128.           width: 2,
  129.           styles: PosStyles(align: PosAlign.center, bold: true)),
  130.       PosColumn(
  131.           text: 'Total',
  132.           width: 2,
  133.           styles: PosStyles(align: PosAlign.right, bold: true)),
  134.     ]);
  136.     bytes += generator.row([
  137.       PosColumn(text: "1", width: 1),
  138.       PosColumn(
  139.           text: "Tea",
  140.           width: 5,
  141.           styles: PosStyles(
  142.             align: PosAlign.left,
  143.           )),
  144.       PosColumn(
  145.           text: "10",
  146.           width: 2,
  147.           styles: PosStyles(
  148.             align: PosAlign.center,
  149.           )),
  150.       PosColumn(text: "1", width: 2, styles: PosStyles(align: PosAlign.center)),
  151.       PosColumn(text: "10", width: 2, styles: PosStyles(align: PosAlign.right)),
  152.     ]);
  154.     bytes += generator.row([
  155.       PosColumn(text: "2", width: 1),
  156.       PosColumn(
  157.           text: "Sada Dosa",
  158.           width: 5,
  159.           styles: PosStyles(
  160.             align: PosAlign.left,
  161.           )),
  162.       PosColumn(
  163.           text: "30",
  164.           width: 2,
  165.           styles: PosStyles(
  166.             align: PosAlign.center,
  167.           )),
  168.       PosColumn(text: "1", width: 2, styles: PosStyles(align: PosAlign.center)),
  169.       PosColumn(text: "30", width: 2, styles: PosStyles(align: PosAlign.right)),
  170.     ]);
  172.     bytes += generator.row([
  173.       PosColumn(text: "3", width: 1),
  174.       PosColumn(
  175.           text: "Masala Dosa",
  176.           width: 5,
  177.           styles: PosStyles(
  178.             align: PosAlign.left,
  179.           )),
  180.       PosColumn(
  181.           text: "50",
  182.           width: 2,
  183.           styles: PosStyles(
  184.             align: PosAlign.center,
  185.           )),
  186.       PosColumn(text: "1", width: 2, styles: PosStyles(align: PosAlign.center)),
  187.       PosColumn(text: "50", width: 2, styles: PosStyles(align: PosAlign.right)),
  188.     ]);
  190.     bytes += generator.row([
  191.       PosColumn(text: "4", width: 1),
  192.       PosColumn(
  193.           text: "Rova Dosa",
  194.           width: 5,
  195.           styles: PosStyles(
  196.             align: PosAlign.left,
  197.           )),
  198.       PosColumn(
  199.           text: "70",
  200.           width: 2,
  201.           styles: PosStyles(
  202.             align: PosAlign.center,
  203.           )),
  204.       PosColumn(text: "1", width: 2, styles: PosStyles(align: PosAlign.center)),
  205.       PosColumn(text: "70", width: 2, styles: PosStyles(align: PosAlign.right)),
  206.     ]);
  208.     bytes += generator.hr();
  210.     bytes += generator.row([
  211.       PosColumn(
  212.           text: 'TOTAL',
  213.           width: 6,
  214.           styles: PosStyles(
  215.             align: PosAlign.left,
  216.             height: PosTextSize.size4,
  217.             width: PosTextSize.size4,
  218.           )),
  219.       PosColumn(
  220.           text: "160",
  221.           width: 6,
  222.           styles: PosStyles(
  223.             align: PosAlign.right,
  224.             height: PosTextSize.size4,
  225.             width: PosTextSize.size4,
  226.           )),
  227.     ]);
  229.     bytes += generator.hr(ch: '=', linesAfter: 1);
  231.     // ticket.feed(2);
  232.     bytes += generator.text('Thank you!',
  233.         styles: PosStyles(align: PosAlign.center, bold: true));
  235.     bytes += generator.text("26-11-2020 15:22:45",
  236.         styles: PosStyles(align: PosAlign.center), linesAfter: 1);
  238.     bytes += generator.text(
  239.         'Note: Goods once sold will not be taken back or exchanged.',
  240.         styles: PosStyles(align: PosAlign.center, bold: false));
  241.     bytes += generator.cut();
  242.     return bytes;
  243.   }
  245.   @override
  246.   Widget build(BuildContext context) {
  247.     return MaterialApp(
  248.       home: Scaffold(
  249.         appBar: AppBar(
  250.           title: const Text('Bluetooth Thermal Printer Demo'),
  251.         ),
  252.         body: Container(
  253.           padding: EdgeInsets.all(20),
  254.           child: Column(
  255.             crossAxisAlignment: CrossAxisAlignment.start,
  256.             children: [
  257.               Text("Search Paired Bluetooth"),
  258.               TextButton(
  259.                 onPressed: () {
  260.                   this.getBluetooth();
  261.                 },
  262.                 child: Text("Search"),
  263.               ),
  264.               Container(
  265.                 height: 200,
  266.                 child: ListView.builder(
  267.                   itemCount: availableBluetoothDevices.length > 0
  268.                       ? availableBluetoothDevices.length
  269.                       : 0,
  270.                   itemBuilder: (context, index) {
  271.                     return ListTile(
  272.                       onTap: () {
  273.                         String select = availableBluetoothDevices[index];
  274.                         List list = select.split("#");
  275.                         // String name = list[0];
  276.                         String mac = list[1];
  277.                         this.setConnect(mac);
  278.                       },
  279.                       title: Text('${availableBluetoothDevices[index]}'),
  280.                       subtitle: Text("Click to connect"),
  281.                     );
  282.                   },
  283.                 ),
  284.               ),
  285.               SizedBox(
  286.                 height: 30,
  287.               ),
  288.               TextButton(
  289.                 onPressed: connected ? this.printGraphics : null,
  290.                 child: Text("Print"),
  291.               ),
  292.               TextButton(
  293.                 onPressed: connected ? this.printTicket : null,
  294.                 child: Text("Print Ticket"),
  295.               ),
  296.             ],
  297.           ),
  298.         ),
  299.       ),
  300.     );
  301.   }
  302. }

esc_pos_bluetooth

非空安全
https://pub.dev/packages/bluetooth_print
测试 无法启动.

网络打印, 不支持蓝牙, pdf 可转图片
https://pub.dev/packages/printing