I am trying to print a receipt which contains Chinese words. (Generic Bluetooth thermal printer)
end up the Chinese character just become some weird symbol.
Is there a need to change the code page used by the printer? (Current CP850)

ticket.row([
PosColumn(
text: "Licence Plate",
width: 6,
styles: PosStyles(align: PosAlign.right, width: PosTextSize.size2, height: PosTextSize.size2),
),
PosColumn(
text: 'AAA1111',
width: 6,
styles: PosStyles(align: PosAlign.left, width: PosTextSize.size2, height: PosTextSize.size2),
),
]);

column width is not correctly calculated if size is not PosTextSize.size1

Hello,
I want to print both image and text in a row. But PosColumn accept only text.

Hi,

I'm trying to display characters in Hebrew in some of my receipts, and although I'm encoding, it comes out as Chinese characters. Any way to print in a non-latin language?

 ticket.row([
        PosColumn(text: '${item.quantity}', width: 2),
        PosColumn(textEncoded: utf8.encode(item.menuItem.name), width: 10), //Where menu item is in hebrew
      ]);

facing version mismatching when I use esc_pos_printer&esc_pos_bluetooth at the same time..
any solution for it?

I see only comments for extenal printer
Can someone tell me if it works with integrated pos printer ?

Do you think replacing it with GS ( L is possible?
I tried to understand how the command should become but i find it too complex.
read these :
https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=98#gs_lparen_cl_fn50
https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=99#gs_lparen_cl_fn112
https://stackoverflow.com/questions/13715950/writing-a-bitmap-to-epson-tm88iv-through-esc-p-commands-write-to-nvram

The images print really slowly because they are being divided in many parts and printed individually right now. This should print it in one piece.

Hi, i have a mobile app in flutter that prints qrcodes using a bluetooth mobile printer.
i'm using these packages:
bluetooth_thermal_printer: ^0.0.4
esc_pos_utils: ^0.4.9

in the example codes for the ticket object, when i use ticket.qrcode(), the arguments are only (content,alignment,correction) and the qrcode is printed with a 13mm margin before the bluetooth printer starts printing the qrcode. Is there a way to adjust the top margin value (via arguments or parameters)? If not, may i request this additional parameters in qrcode printing?

Thanks.

How to print Barcode without text.
I´m using esc_pos_bluetooth: ^0.2.8

ticket.barcode(
Barcode.code39("123456-2-0001".split("")),
width: 1,
height: 120,
font: BarcodeFont.fontA,
align: PosAlign.left);

Have limited horizontal space on 58mm

gbk_codec 0.4.0 is now available.
Some packages give html dependency version incompatible exception.

I use esc_pos_bluetooth which need Ticket class to print, however this new version is return List

Hi,

Great library, tested all the calls. Theres an issue with how PosColumn is handling width.

Although the columns specified, the print out does not wrap the within its "column width". Currently it prints all out in one line and for a very long text it'll just wrap the "complete" line rather than the text within the middle column.

ticket.row([
PosColumn(text: 'hello', width: 1),
PosColumn(text: 'a very very very very long text should wrap', width: 5)
PosColumn(text: 'final column', width: 6)
]

Thai character encoded with "cp874" PosCodeTable.thai_1&2 print result is unreadable

Hi.
in PC we can print document using esc/pos printer.

how to do it in mobile.

The NetworkPrinter doesn't pass the length along to the generator:

void hr({String ch = '-', int len, int linesAfter = 0}) {
    _socket.add(_generator.hr(ch: ch, linesAfter: linesAfter));
  }

And the length isn't calculated correctly. The length seems to depend on the previously used font, but hr always uses fontA. If the previous line uses fontB then the hr is too long:

List<int> hr({String ch = '-', int len, int linesAfter = 0}) {
    List<int> bytes = [];
    int n = len ?? _maxCharsPerLine ?? _getMaxCharsPerLine(_styles.fontType);
    String ch1 = ch.length == 1 ? ch : ch[0];
    bytes += text(List.filled(n, ch1).join(), linesAfter: linesAfter);
    return bytes;
  }

Setting the global font to fontA before hr helps, but then font changes in the style don't work so you need to set the global font for every font change:

printer.setGlobalFont(PosFontType.fontA);
printer.hr();

Thanks for the package provided but when I am using esc_pos_utils_plus-2.0.1+3 and the row didn't go to next line when it is too long. It will just ignore my content.

How to send the printout to a specific printer to install in the windows device manager?

Hi,

I am working on a package for scanning and persistent federated printing (bluetooth, network, star printers, brother label printers etc) of pos receipts using BLoC patterns (pos_printer_bloc)[https://github.com/apexlabs-ai/pos_printer_bloc] and I'm trying to base it on esc_pos_utils

One limitation I've come across is that I would like to have an abstraction layer between the ticket lines and the actual ESC representation.

I've now come up with this:

https://github.com/apexlabs-ai/pos_printer_bloc/blob/master/lib/src/pos_ticket_line.dart

and it would be good to have a constructor inside of esc_pos_utils Ticket.fromLines() to avoid the code duplication to go something like:

  Ticket _ticketFromLines(PaperSize paperSize, CapabilityProfile profile, {List <PosTicketLine> lines}) {
    final ticket = Ticket(paperSize, profile);
    for(var line in lines) {
      if(line is PosTicketText) {
        ticket.text(line.text, styles: line.styles, linesAfter: line.linesAfter);
      } else if(line is PosTicketRow) {
        ticket.row(line.cols);
      } else if(line is PosTicketBeep) {
        ticket.beep(n: line.n, duration: line.duration);
      } else if(line is PostTicketReset) {
        ticket.reset();
      } else if(line is PosTicketCut) {
        ticket.cut(mode: line.mode);
      } else if(line is PosTicketHr) {
        ticket.hr();
      } else if(line is PosTicketDrawer) {
        ticket.drawer(pin: line.pin);
      } else if(line is PosTicketFeed) {
        ticket.feed(line.lines);
      } else if(line is PosTicketImage) {
        ticket.image(line.image, align: line.align);
      } else if(line is PosTicketBarcode) {
        ticket.barcode(line.barcode,
            width: line.width,
            height: line.height,
            font: line.font,
            textPos: line.textPos,
            align: line.align
        );
      } else if(line is PosTicketQrcode) {
        ticket.qrcode(line.text, align: line.align,
            size: line.size,
            cor: line.correction);
      } else {
        print("_ticketFromLines: unsupported line type ${line.runtimeType}");
      }
    }
    return ticket;
  }

This would allow us to have similar methods for other printers, like:

  PrintCommands _commandsFromLines({List <PosTicketLine> lines}) {
    PrintCommands commands = PrintCommands();

    //    commands.appendEncoding(StarEncoding.UTF8);
    for(var line in lines) {
      if(line is PosTicketText) {
        commands.appendBitmapText(
            text: line.text,
            alignment:  _starAlignment[line.styles.align],
//            fontSize: line.styles.height.value,
//            width: line.styles.width.value
        );
      } else if(line is PosTicketCut) {
        commands.appendCutPaper(_starCutAction[line.mode]);
      } else if(line is PosTicketHr) {
        commands.appendBitmapText(text: '--------------------------------------');
      } else if(line is PosTicketFeed) {
        for (int i = 1; i < line.lines; i++) {
          commands.appendBitmapText(text: "\n\n");
        }
      } else {
        print("_commandsFromLines: unsupported line type ${line.runtimeType}");
      }
    }

Hello!
I got errors when install esc_pos_.

Here my packages:

esc_pos_utils: ^0.4.7
esc_pos_bluetooth: ^0.2.8
esc_pos_printer: ^3.2.7
flutter_bluetooth_basic: ^0.1.5

When I get package flutter pub get I got:

Because esc_pos_bluetooth >=0.2.8 depends on esc_pos_utils ^0.3.6 and ineonspm depends on esc_pos_utils ^0.4.7, esc_pos_bluetooth >=0.2.8 is forbidden.
So, because ineonspm depends on esc_pos_bluetooth ^0.2.8, version solving failed.

icket.text('简体中文',
styles: PosStyles(
height: PosTextSize.size2,
width: PosTextSize.size2,
));
Invalid argument (string): Contains invalid characters.: "简体中文"

please change QRCode function

List textBytes = utf8.encode(text);

Ca't print Special characters like currency symbol

like NumberFormat.simpleCurrency(name: 'INR').currencySymbol as String ₹

error:

[ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: Invalid argument (string): Contains invalid characters.: "₹102.90"
E/flutter ( 1978): #0      _UnicodeSubsetEncoder.convert (dart:convert/ascii.dart:88:9)
E/flutter ( 1978): #1      Latin1Codec.encode (dart:convert/latin1.dart:42:46)
E/flutter ( 1978): #2      Ticket._encode (package:esc_pos_utils/src/ticket.dart:67:21)

I am unable to print using network thermal printer Epson TM M30 after Flutter 2 update.
The app opens the Android Print option when the printing code is executed.

I would try to work out a standardised testing workflow, so that new printers and / or changes of the implemented features can be tested easily and repeatable.
I think issues could be tracked down faster with the information of some standard test.

I got this idea, because I am working with a thermal printer, that is not in the list of tested printers, but I don't know if I had tested everything, for example.
But I don't have unlimited access to this printer.
So it would have been nice to just fire up a test-app that handles all the cases.

What do you guys think about that?
Any further ideas about this?

Last but not least, @andrey-ushakov, thank you for this great package. It helped me quite a lot.

Hello,

I'm having a text alignment problem with my EPSON TM-m30 printer.

With the following code, both lines are left aligned:

final CapabilityProfile profile = await CapabilityProfile.load();
final PrinterNetworkManager printerManager = PrinterNetworkManager();
printerManager.selectPrinter('192.168.1.49', port: 9100);

final Ticket ticket = Ticket(PaperSize.mm80, profile);
ticket.text('Text center', styles: PosStyles(align: PosAlign.center));
ticket.text('Text left', styles: PosStyles(align: PosAlign.left));
ticket.cut();

PosPrintResult result = await printerManager.printTicket(ticket);
print('Print result: ${result.msg}');

Result:

Version: esc_pos_printer: ^3.2.4

in some printers texts not printing...

only printing image.
here is the printer self test print page.

Showing default code page 255 and encoding UTF8

Printer Name : E-POS
Model : ECO250

Is there any way to preview the ticket? in terminal or something before print?

@andrey-ushakov Are you working on this package or not? There are 20+ issues that are open and you are not adding any comments on them. Also As I can the last release for this package was made on Mar 12, 2020. Can you please provide an update on it or add some contributors under this package?

you need to add this check because if image is already divisible by 8 you add 8 extra pixels and image is distorted.

if(widthPx % 8 != 0) {
final targetWidth = (widthPx + 8) - (widthPx % 8);
final missingPx = targetWidth - widthPx;
final extra = Uint8List(missingPx);
for (int i = 0; i < heightPx; i++) {
final pos = (i * widthPx + widthPx) + i * missingPx;
oneChannelBytes.insertAll(pos, extra);
}
}

adding a feature as exporting to image or pdf to be able to test the receipt while development without the need of a physical printer .

I‘m print my code，but title before always have “0”，I try remove it，but I can't. My english not good，i upload image.Thank you：

Hi, I could't find how to send generated data to usb printer or a specific usb printer on windows.

Hi Dear,

I'm trying to print receipt in Arabic language but the text some times appear as Inverse and dashed
My Printer Model is : TM-m30 .
Table Code WPC1256 , PC864 and PC720 .
CharsetConverter: cp864, windows-1256.

I get these code from https://reference.epson-biz.com/modules/ref_charcode_en/index.php?content_id=47.

Resetting the image after every added text slows printing but changing the styling every time does not.
Removed reset() from here:
void textEncoded(
Uint8List textBytes, {
PosStyles styles = const PosStyles(),
int linesAfter = 0,
}) {
_text(textBytes, styles: styles);
// Ensure at least one line break after the text
emptyLines(linesAfter + 1);
reset();
}

and changed this:
bytes += styles.bold ? cBoldOn.codeUnits : [];
bytes += styles.turn90 ? cTurn90On.codeUnits : [];
bytes += styles.reverse ? cReverseOn.codeUnits : [];
bytes += styles.underline ? cUnderline1dot.codeUnits : [];
bytes += styles.fontType == PosFontType.fontB ? cFontB.codeUnits : [];
// Characters size
if (styles.height.value != PosTextSize.size1.value ||
styles.width.value != PosTextSize.size1.value) {
bytes += Uint8List.fromList(
List.from(cSizeGSn.codeUnits)
..add(PosTextSize.decSize(styles.height, styles.width)),
);
}

to this:
bytes += styles.bold ? cBoldOn.codeUnits : cBoldOff.codeUnits;
bytes += styles.turn90 ? cTurn90On.codeUnits : cTurn90Off.codeUnits;
bytes += styles.reverse ? cReverseOn.codeUnits : cReverseOff.codeUnits;
bytes += styles.underline ? cUnderline1dot.codeUnits : cUnderlineOff.codeUnits;
bytes += styles.fontType == PosFontType.fontB ? cFontB.codeUnits : cFontA.codeUnits;
// Characters size
bytes += Uint8List.fromList(
List.from(cSizeGSn.codeUnits)
..add(PosTextSize.decSize(styles.height, styles.width)),
);

and performance improvements were huge.
Consider testing this and if it works for you too consider changing it.

Please add more font faces such as arial.etc
Please add more size options lower than size1

Texts are always aligned left.
It is not updated through the text styling.

How to print barcode with characters

need to Print A12345

Hi,

How to set paper size for 4inch shipping label?

Thanks

Hi,

The image package is use by firebase, they are using the version 3.x.x
Obviously you are using the previous version 2.x.x, have you planned to migrate your package to image 3.x.x?

Maybe integrate the brand new you NullSafe?

Thanks

This feature is possible?
Printing in Windows / Linux USB printers.

Hola estoy tratando de implementar tu package en mi app, pero no me reconoce la impresora bluethoo estoy utilizando una Zebra MZ 220 actualmente tengo el package "blue_thermal_printer", solo que este no me respeta las posiciones de los textos y quiero ver si el tuyo lo hace pero como te comento no me reconoce la impresora y no se por que. Podrias ayudarme a decirme que tendria que hacer para que me la reconozca te lo agradeceria mucho.

We need to be able to create PosCodeTable.
It seems to me that not all printers have the same code tables.
I need to use greek on epson printer.
Check here for epson code pages.
https://reference.epson-biz.com/modules/ref_charcode_en/index.php?content_id=1

I would like to be able to do something like PosCodeTable(15).

Cannot add already encoded text in rows

Am I code It wrong, because code type also printed.
I need to only printed 002518276559
Please help

  /// CODE128
  ///
  /// k >= 2
  /// d: '{A'/'{B'/'{C' => '0'–'9', A–D, a–d, $, +, −, ., /, :
  /// usage:
  /// {A = QRCode type A
  /// {B = QRCode type B
  /// {C = QRCode type C
  /// barcodeData ex.: "{A978020137962".split("");


    final List<dynamic> barcdA = "{A002518276559".split("");
    final List<dynamic> barcdB = "{B002518276559".split("");
    final List<dynamic> barcdC = "{C002518276559".split("");

    ticket += generator.text("code128 A");
    ticket += generator.barcode(Barcode.code128(barcdA));
    ticket += generator.text("code128 B");
    ticket += generator.qrcode(Barcode.code128(barcdB));
    ticket += generator.text("code128 C");
    ticket += generator.qrcode(Barcode.code128(barcdC));

I need to print product sticker labels with barcodes and details. so how can I set the paper size for the same

How i can verify if my printer is out of paper?

I tested and i get "Success" PosPrintResult message when the printer is out of paper and after i put new paper it starts printing all my past requests.

I'm using EPSON TM-T20X printer and other stuffs are working fine.