How to print vietnamese language?

[ndhhaiduong]

Can i print vietnamese language?

I used code:

Uint8List  encVn =
    await CharsetConverter.encode("ISO-8859-1", 'Tiếng Việt, còn gọi tiếng Việt');
    ticket.textEncoded(encVn, styles: PosStyles(bold: true, align: PosAlign.center, codeTable: PosCodeTable.vietnam));

esc_pos_printer: ^3.1.6 charset_converter: ^1.0.3 Printer: Xprinter

I found list charsets: I/flutter (28800): Adobe-Standard-Encoding I/flutter (28800): Big5 I/flutter (28800): Big5-HKSCS I/flutter (28800): BOCU-1 I/flutter (28800): CESU-8 I/flutter (28800): cp1363 I/flutter (28800): cp851 I/flutter (28800): EUC-JP I/flutter (28800): EUC-KR I/flutter (28800): GB18030 I/flutter (28800): GBK I/flutter (28800): hp-roman8 I/flutter (28800): HZ-GB-2312 I/flutter (28800): IBM-Thai I/flutter (28800): IBM00858 I/flutter (28800): IBM01140 I/flutter (28800): IBM01141 I/flutter (28800): IBM01142 I/flutter (28800): IBM01143 I/flutter (28800): IBM01144 I/flutter (28800): IBM01145 I/flutter (28800): IBM01146 I/flutter (28800): IBM01147 I/flutter (28800): IBM01148 I/flutter (28800): IBM01149 I/flutter (28800): IBM037 I/flutter (28800): IBM1026 I/flutter (28800): IBM1047 I/flutter (28800): IBM273 I/flutter (28800): IBM277 I/flutter (28800): IBM278 I/flutter (28800): IBM280 I/flutter (28800): IBM284 I/flutter (28800): IBM285 I/flutter (28800): IBM290 I/flutter (28800): IBM297 I/flutter (28800): IBM420 I/flutter (28800): IBM424 I/flutter (28800): IBM437 I/flutter (28800): IBM500 I/flutter (28800): IBM775 I/flutter (28800): IBM850 I/flutter (28800): IBM852 I/flutter (28800): IBM855 I/flutter (28800): IBM857 I/flutter (28800): IBM860 I/flutter (28800): IBM861 I/flutter (28800): IBM862 I/flutter (28800): IBM863 I/flutter (28800): IBM864 I/flutter (28800): IBM865 I/flutter (28800): IBM866 I/flutter (28800): IBM868 I/flutter (28800): IBM869 I/flutter (28800): IBM870 I/flutter (28800): IBM871 I/flutter (28800): IBM918 I/flutter (28800): ISO-2022-CN I/flutter (28800): ISO-2022-CN-EXT I/flutter (28800): ISO-2022-JP I/flutter (28800): ISO-2022-JP-1 I/flutter (28800): ISO-2022-JP-2 I/flutter (28800): ISO-2022-KR I/flutter (28800): ISO-8859-1 I/flutter (28800): ISO-8859-10 I/flutter (28800): ISO-8859-13 I/flutter (28800): ISO-8859-14 I/flutter (28800): ISO-8859-15 I/flutter (28800): ISO-8859-2 I/flutter (28800): ISO-8859-3 I/flutter (28800): ISO-8859-4 I/flutter (28800): ISO-8859-5 I/flutter (28800): ISO-8859-6 I/flutter (28800): ISO-8859-7 I/flutter (28800): ISO-8859-8 I/flutter (28800): ISO-8859-9 I/flutter (28800): KOI8-R I/flutter (28800): KOI8-U I/flutter (28800): macintosh I/flutter (28800): SCSU I/flutter (28800): Shift_JIS I/flutter (28800): TIS-620 I/flutter (28800): US-ASCII I/flutter (28800): UTF-16 I/flutter (28800): UTF-16BE I/flutter (28800): UTF-16LE I/flutter (28800): UTF-32 I/flutter (28800): UTF-32BE I/flutter (28800): UTF-32LE I/flutter (28800): UTF-7 I/flutter (28800): UTF-8 I/flutter (28800): windows-1250 I/flutter (28800): windows-1251 I/flutter (28800): windows-1252 I/flutter (28800): windows-1253 I/flutter (28800): windows-1254 I/flutter (28800): windows-1255 I/flutter (28800): windows-1256 I/flutter (28800): windows-1257 I/flutter (28800): windows-1258 I/flutter (28800): x-compound-text I/flutter (28800): x-ebcdic-xml-us I/flutter (28800): x-euc-tw-2014 I/flutter (28800): x-gsm-03.38-2009 I/flutter (28800): x-ibm-1047-s390 I/flutter (28800): x-ibm-1125_P100-1997 I/flutter (28800): x-ibm-1129_P100-1997 I/flutter (28800): x-ibm-1130_P100-1997 I/flutter (28800): x-ibm-1131_P100-1997 I/flutter (28800): x-ibm-1132_P100-1998 I/flutter (28800): x-ibm-1133_P100-1997 I/flutter (28800): x-ibm-1137_P100-1999 I/flutter (28800): x-ibm-1140-s390 I/flutter (28800): x-ibm-1141-s390 I/flutter (28800): x-ibm-1142-s390 I/flutter (28800): x-ibm-1143-s390 I/flutter (28800): x-ibm-1144-s390 I/flutter (28800): x-ibm-1145-s390 I/flutter (28800): x-ibm-1146-s390 I/flutter (28800): x-ibm-1147-s390 I/flutter (28800): x-ibm-1148-s390 I/flutter (28800): x-ibm-1149-s390 I/flutter (28800): x-ibm-1153-s390 I/flutter (28800): x-ibm-1154_P100-1999 I/flutter (28800): x-ibm-1155_P100-1999 I/flutter (28800): x-ibm-1156_P100-1999 I/flutter (28800): x-ibm-1157_P100-1999 I/flutter (28800): x-ibm-1158_P100-1999 I/flutter (28800): x-ibm-1160_P100-1999 I/flutter (28800): x-ibm-1162_P100-1999 I/flutter (28800): x-ibm-1164_P100-1999 I/flutter (28800): x-ibm-1250_P100-1995 I/flutter (28800): x-ibm-1251_P100-1995 I/flutter (28800): x-ibm-1252_P100-2000 I/flutter (28800): x-ibm-1253_P100-1995 I/flutter (28800): x-ibm-1254_P100-1995 I/flutter (28800): x-ibm-1255_P100-1995 I/flutter (28800): x-ibm-1256_P110-1997 I/flutter (28800): x-ibm-1257_P100-1995 I/flutter (28800): x-ibm-1258_P100-1997 I/flutter (28800): x-ibm-12712-s390 I/flutter (28800): x-ibm-12712_P100-1998 I/flutter (28800): x-ibm-1373_P100-2002 I/flutter (28800): x-ibm-1383_P110-1999 I/flutter (28800): x-ibm-1386_P100-2001 I/flutter (28800): x-ibm-16684_P110-2003 I/flutter (28800): x-ibm-16804-s390 I/flutter (28800): x-ibm-16804_X110-1999 I/flutter (28800): x-ibm-25546 I/flutter (28800): x-ibm-33722_P12A_P12A-2009_U2 I/flutter (28800): x-ibm-37-s390 I/flutter (28800): x-ibm-4517_P100-2005 I/flutter (28800): x-ibm-4899_P100-1998 I/flutter (28800): x-ibm-4909_P100-1999 I/flutter (28800): x-ibm-4971_P100-1999 I/flutter (28800): x-ibm-5123_P100-1999 I/flutter (28800): x-ibm-5351_P100-1998 I/flutter (28800): x-ibm-5352_P100-1998 I/flutter (28800): x-ibm-5353_P100-1998 I/flutter (28800): x-ibm-5478_P100-1995 I/flutter (28800): x-ibm-803_P100-1999 I/flutter (28800): x-ibm-813_P100-1995 I/flutter (28800): x-ibm-8482_P100-1999 I/flutter (28800): x-ibm-901_P100-1999 I/flutter (28800): x-ibm-902_P100-1999 I/flutter (28800): x-ibm-9067_X100-2005 I/flutter (28800): x-ibm-916_P100-1995 I/flutter (28800): x-IBM1006 I/flutter (28800): x-IBM1025 I/flutter (28800): x-IBM1097 I/flutter (28800): x-IBM1098 I/flutter (28800): x-IBM1112 I/flutter (28800): x-IBM1122 I/flutter (28800): x-IBM1123 I/flutter (28800): x-IBM1124 I/flutter (28800): x-IBM1153 I/flutter (28800): x-IBM1363 I/flutter (28800): x-IBM1364 I/flutter (28800): x-IBM1371 I/flutter (28800): x-IBM1388 I/flutter (28800): x-IBM1390 I/flutter (28800): x-IBM1399 I/flutter (28800): x-IBM33722 I/flutter (28800): x-IBM720 I/flutter (28800): x-IBM737 I/flutter (28800): x-IBM856 I/flutter (28800): x-IBM867 I/flutter (28800): x-IBM874 I/flutter (28800): x-IBM875 I/flutter (28800): x-IBM922 I/flutter (28800): x-IBM930 I/flutter (28800): x-IBM933 I/flutter (28800): x-IBM935 I/flutter (28800): x-IBM937 I/flutter (28800): x-IBM939 I/flutter (28800): x-IBM942 I/flutter (28800): x-IBM943 I/flutter (28800): x-IBM949 I/flutter (28800): x-IBM949C I/flutter (28800): x-IBM950 I/flutter (28800): x-IBM954 I/flutter (28800): x-IBM964 I/flutter (28800): x-IBM970 I/flutter (28800): x-IBM971 I/flutter (28800): x-IMAP-mailbox-name I/flutter (28800): x-iscii-be I/flutter (28800): x-iscii-gu I/flutter (28800): x-iscii-ka I/flutter (28800): x-iscii-ma I/flutter (28800): x-iscii-or I/flutter (28800): x-iscii-pa I/flutter (28800): x-iscii-ta I/flutter (28800): x-iscii-te I/flutter (28800): x-ISCII91 I/flutter (28800): x-ISO-2022-CN-CNS I/flutter (28800): x-iso-8859-11 I/flutter (28800): x-JavaUnicode I/flutter (28800): x-JavaUnicode2 I/flutter (28800): x-JIS7 I/flutter (28800): x-JIS8 I/flutter (28800): x-LMBCS-1 I/flutter (28800): x-mac-centraleurroman I/flutter (28800): x-mac-cyrillic I/flutter (28800): x-mac-greek I/flutter (28800): x-mac-turkish I/flutter (28800): x-MS950-HKSCS I/flutter (28800): x-UnicodeBig I/flutter (28800): x-UTF-16LE-BOM I/flutter (28800): x-UTF16_OppositeEndian I/flutter (28800): x-UTF16_PlatformEndian I/flutter (28800): x-UTF32_OppositeEndian I/flutter (28800): x-UTF32_PlatformEndian How can I fix it? Please give me any suggestions here. Thanks!

[ghost]

@ndhhaiduong

Did you find any solution? I am having the same problem with Japanese characters. Please share if you have found any solution.

[HUANGLIWEN]

I have same issue, I printed Thai.

[ndhhaiduong]

@ndhhaiduong

Did you find any solution? I am having the same problem with Japanese characters. Please share if you have found any solution.

I'm still having a problem.

[ngdangduy13]

Do u found any solution?

[TungPT95]

hello @andrey-ushakov , any solution for this issue, or could i know the charset using with charset_converter to encode vietnamese text?

[nielsezeka]

My solution in create an image from canvas and using draw image to print, here is an sample code to generate image as Uint8List :

Future<Uint8List> _generateImageFromString(
    String text,
    ui.TextAlign align,
  ) async {
    ui.PictureRecorder recorder = new ui.PictureRecorder();
    Canvas canvas = Canvas(
        recorder,
        Rect.fromCenter(
          center: Offset(0, 0),
          width: 550,
          height: 400, // cheated value, will will clip it later...
        ));
    TextSpan span = TextSpan(
      style: const TextStyle(
        color: Colors.black,
        fontSize: 20,
        fontWeight: ui.FontWeight.bold,
      ),
      text: text,
    );
    TextPainter tp = TextPainter(
        text: span,
        maxLines: 3,
        textAlign: align,
        textDirection: TextDirection.ltr);
    tp.layout(minWidth: 550, maxWidth: 550);
    tp.paint(canvas, const Offset(0.0, 0.0));
    var picture = recorder.endRecording();
    final pngBytes = await picture.toImage(
      tp.size.width.toInt(),
      tp.size.height.toInt() - 2, // decrease padding
    );
    final byteData = await pngBytes.toByteData(format: ui.ImageByteFormat.png);
    return byteData!.buffer.asUint8List();
  }

Now can print it using

final imageBytes = await _generateImageFromString(
      textToPrint,
      TextAlign.center,
    );
final posImage.Image? image = posImage.decodeImage(imageBytes);
printer.image(image!); 

Same solution apply to printRow...(long code and really ugly :v but it can do the job until official support release)

From my point of view, this solution has:

Advantages:

• any fonts (google font....)
• any languages.

Disadvantages:

• not native-feeling with printer(the font, line spacing...)

[iyashiyas]

i found solution with capture image and send image to print. but it is not good solutions. some of the printer not support large length of image and become slow. anyone have solution?

[niyonx]

@nielsezeka hey, how would you change this solution to do a receipt layout? I believe it's what you meant by "Same solution apply to printRow..."

[niyonx]

@iyashiyas if you don't mind, do you use the screenshot class? I have tried using it but it prints really bad

[taida2203]

I faced same issues. Already tried with charset UTF-8 but it's not work