print_bluetooth_thermal 1.1.3

Ticket printing for android, location permission is not requested to connect the printer

print_bluetooth_thermal

Package to print tickets on 58mm or 80mm thermal printers on Android or IOS.

This package emerged as an alternative to the current ones that use the location permission and Google Play blocks apps that don't explain what to use location permission for.

If you want to supply the c++ code, you need to receive raw bytes to use the byte class

Getting Started

• Import the package print_bluetooth_thermal.

• If you want to print images, qr code, barcode use the package esc_pos_utils_plus.

#Configure in IOS

In Info.plist add line in folder/ios/runner/info.plist

<key>NSBluetoothAlwaysUsageDescription</key>
<string>Bluetooth access to connect 58mm or 80mm thermal printers</string>

1. Import the package

import 'package:print_bluetooth_thermal/print_bluetooth_thermal.dart';

2. After that you can use

PrintBluetoothThermal

Available functions

Comando	Descripción
PrintBluetoothThermal.isPermissionBluetoothGranted	Returns true if the BLUETOOTH_CONNECT permission is enabled, it is only required from android 12 onwards
PrintBluetoothThermal.bluetoothEnabled	Returns true if bluetooth is on
PrintBluetoothThermal.pairedBluetooths	Android: Return all paired bluetooth on the device IOS: Return nearby bluetooths
PrintBluetoothThermal.connectionStatus	Returns true if you are currently connected to the printer
PrintBluetoothThermal.connect	Send connection to ticket printer and wait true if it was successfull, the mac address of the printer's bluetooth must be sent
PrintBluetoothThermal.writeBytes	Send bytes to print, esc_pos_utils_plus package must be used, returns true if successfu
PrintBluetoothThermal.writeString	Strings are sent to be printed by the PrintTextSize class can print from size 1 (50%) to size 5 (400%)
PrintBluetoothThermal.disconnect	Disconnect print
PrintBluetoothThermal.platformVersion	Gets the android version where it is running, returns String
PrintBluetoothThermal.batteryLevel	Get the percentage of the battery returns int

Available commands by platform

Function	Android	iOS	Windows
PrintBluetoothThermal.isPermissionBluetoothGranted	✅	✅	❌
PrintBluetoothThermal.bluetoothEnabled	✅	✅	❌
PrintBluetoothThermal.pairedBluetooths	✅	✅	✅
PrintBluetoothThermal.connectionStatus	✅	✅	✅
PrintBluetoothThermal.connect	✅	✅	✅
PrintBluetoothThermal.writeBytes	✅	✅	✅
PrintBluetoothThermal.writeString	✅	✅	❌
PrintBluetoothThermal.disconnect	✅	✅	✅
PrintBluetoothThermal.platformVersion	✅	✅	❌
PrintBluetoothThermal.batteryLevel	✅	✅	❌

Examples

Detect if bluetooth is turned on

See if bluetooth is on

final bool result = await PrintBluetoothThermal.bluetoothEnabled;

Read paired bluetooth

Read the bluetooth linked to the phone, to be able to connect to the printer it must have been previously linked in phone settings bluetooth option

final List<BluetoothInfo> listResult = await PrintBluetoothThermal.pairedBluetooths;
await Future.forEach(listResult, (BluetoothInfo bluetooth) {
  String name = bluetooth.name;
  String mac = bluetooth.macAdress;
});

Connect printer

String mac = "66:02:BD:06:18:7B";
final bool result = await PrintBluetoothThermal.connect(macPrinterAddress: mac);

Disonnect printer

final bool result = await PrintBluetoothThermal.disconnect;

Detect if connection status

The connection is maintained by a Kotlin Corroutine and the printer will not disconnect even if you move it far away

final bool connectionStatus = await PrintBluetoothThermal.connectionStatus;

Print text of different sizes

 bool conexionStatus = await PrintBluetoothThermal.connectionStatus;
  if (conexionStatus) {
    String enter = '\n';
    await PrintBluetoothThermal.writeBytes(enter.codeUnits);
    //size of 1-5
    String text = "Hello $enter";
    await PrintBluetoothThermal.writeString(printText: PrintTextSize(size: 1, text: text + " size 1"));
    await PrintBluetoothThermal.writeString(printText: PrintTextSize(size: 2, text: text + " size 2"));
    await PrintBluetoothThermal.writeString(printText: PrintTextSize(size: 3, text: text + " size 3"));
    await PrintBluetoothThermal.writeString(printText: PrintTextSize(size: 2, text: text + " size 4"));
    await PrintBluetoothThermal.writeString(printText: PrintTextSize(size: 3, text: text + " size 5"));
  } else {
    print("the printer is disconnected ($conexionStatus)");
  }

Print on the printer with the package esc_pos_utils_plus.

call PrintTest()

Future<void> printTest() async {
    bool conecctionStatus = await PrintBluetoothThermal.connectionStatus;
    if (conecctionStatus) {
      List<int> ticket = await testTicket();
      final result = await PrintBluetoothThermal.writeBytes(ticket);
      print("print result: $result");
    } else {
      //no connected
    }
}

Future<List<int>> testTicket() async {
    List<int> bytes = [];
    // Using default profile
    final profile = await CapabilityProfile.load();
    final generator = Generator(PaperSize.mm58, profile);
    //bytes += generator.setGlobalFont(PosFontType.fontA);
    bytes += generator.reset();

    final ByteData data = await rootBundle.load('assets/mylogo.jpg');
    final Uint8List bytesImg = data.buffer.asUint8List();
    final image = Imag.decodeImage(bytesImg);
    // Using `ESC *`
    bytes += generator.image(image!);

    bytes += generator.text('Regular: aA bB cC dD eE fF gG hH iI jJ kK lL mM nN oO pP qQ rR sS tT uU vV wW xX yY zZ', styles: PosStyles());
    bytes += generator.text('Special 1: ñÑ àÀ èÈ éÉ üÜ çÇ ôÔ', styles: PosStyles(codeTable: 'CP1252'));
    bytes += generator.text(
      'Special 2: blåbærgrød',
      styles: PosStyles(codeTable: 'CP1252'),
    );

    bytes += generator.text('Bold text', styles: PosStyles(bold: true));
    bytes += generator.text('Reverse text', styles: PosStyles(reverse: true));
    bytes += generator.text('Underlined text', styles: PosStyles(underline: true), linesAfter: 1);
    bytes += generator.text('Align left', styles: PosStyles(align: PosAlign.left));
    bytes += generator.text('Align center', styles: PosStyles(align: PosAlign.center));
    bytes += generator.text('Align right', styles: PosStyles(align: PosAlign.right), linesAfter: 1);

    bytes += generator.row([
      PosColumn(
        text: 'col3',
        width: 3,
        styles: PosStyles(align: PosAlign.center, underline: true),
      ),
      PosColumn(
        text: 'col6',
        width: 6,
        styles: PosStyles(align: PosAlign.center, underline: true),
      ),
      PosColumn(
        text: 'col3',
        width: 3,
        styles: PosStyles(align: PosAlign.center, underline: true),
      ),
    ]);

    //barcode
    final List<int> barData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 4];
    bytes += generator.barcode(Barcode.upcA(barData));

    //QR code
    bytes += generator.qrcode('example.com');

    bytes += generator.text(
      'Text size 50%',
      styles: PosStyles(
        fontType: PosFontType.fontB,
      ),
    );
    bytes += generator.text(
      'Text size 100%',
      styles: PosStyles(
        fontType: PosFontType.fontA,
      ),
    );
    bytes += generator.text(
      'Text size 200%',
      styles: PosStyles(
        height: PosTextSize.size2,
        width: PosTextSize.size2,
      ),
    );

    bytes += generator.feed(2);
    //bytes += generator.cut();
    return bytes;
}

Screenshot of the example app, you can copy the code from the example

Ticket printed with various sizes

Ticket printed with various forms

Built with 🛠️

Thanks to these tools this fabulous project has been created

• Dart - language used
• kotlin - language used
• Swift - language used
• Flutter - framework used

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License

Note: This license has also been called the "New BSD License" or "Modified BSD License". See also the 2-clause BSD License.

Copyright

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Created with ❤️ by andresperezmelo 😊 Andres Perez Melo