wwandreww/esc_pos_bluetooth

기술 주제

# dart # flutter # bluetooth-printer # pos # receipt # thermal-printer # receipt-printer # esc

사용 중인 의존성

의존성 목록 5 개

flutter{"sdk":"flutter"}
rxdart^0.26.0
esc_pos_utils^1.1.0
flutter_bluetooth_basic^0.1.7
flutter_test개발 의존성{"sdk":"flutter"}

원본 README

아래는 영문 원문 스냅샷입니다. 최신 내용은 GitHub에서 확인하세요.

README 펼치기 / 접기

esc_pos_bluetooth

Pub Version

The library allows to print receipts using a Bluetooth printer. For WiFi/Ethernet printers, use esc_pos_printer library.

TODO (PRs are welcomed!)

Split byte data into chunks: issue
Print QR Codes using the GS ( k command (printing QR code from an image already supported)
PDF-417 Barcodes using the GS ( k command
Line spacing using the ESC 3 <n> command

How to Help

Test your printer and add it in the table: Wifi/Network printer or Bluetooth printer
Test and report bugs
Share your ideas about what could be improved (code optimization, new features...)
PRs are welcomed!

Tested Printers

Here are some printers tested with this library. Please add the models you have tested to maintain and improve this library and help others to choose the right printer.

Generate a Ticket

Simple Ticket with Styles:

Ticket testTicket() {
  final Ticket ticket = Ticket(PaperSize.mm80);

  ticket.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');
  ticket.text('Special 1: àÀ èÈ éÉ ûÛ üÜ çÇ ôÔ',
      styles: PosStyles(codeTable: PosCodeTable.westEur));
  ticket.text('Special 2: blåbærgrød',
      styles: PosStyles(codeTable: PosCodeTable.westEur));

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

  ticket.text('Text size 200%',
      styles: PosStyles(
        height: PosTextSize.size2,
        width: PosTextSize.size2,
      ));

  ticket.feed(2);
  ticket.cut();
  return ticket;
}

You can find more examples here: esc_pos_utils.

Print a Ticket

PrinterBluetoothManager printerManager = PrinterBluetoothManager();

printerManager.scanResults.listen((printers) async {
  // store found printers
});
printerManager.startScan(Duration(seconds: 4));

// ...

printerManager.selectPrinter(printer);
final PosPrintResult res = await printerManager.printTicket(testTicket());

print('Print result: ${res.msg}');

For a complete example, check the demo project example/blue.

Troubleshooting

If your printer prints only 5%-10% of an image and then stops, or it can't print more than 1 image on the same ticket, or it can't print long tickets, try to ajust queueSleepTimeMs of the PrinterBluetoothManager.printTicket (try 50 or 100ms): printerManager.printTicket(await demoReceipt(paper), queueSleepTimeMs: 50);

Test Print

test receipt test receipt

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