printQrCode method

void printQrCode(String data, { QrCodeModel model = QrCodeModel.model1, int size = 6, QrErrorLevel errorLevel = QrErrorLevel.low, PrintAlignment? alignment, })

Print QrCode containing data and specify it's model, size and errorLevel.

Most thermal printer only have two models which are QrCodeModel.model1 and QrCodeModel.model2, but certain printer model also have QrCodeModel.micro model. Check your printer manufacturer documentation to know whether your printer can also print QrCodeModel.micro model.

QrCode size can be ranging from 1 to 16. A certain printer model can only be ranging from 3 to 16. Check your printer manufacturer documentation to know what size range can it print.

QrErrorLevel specify the QrCode error correction level.

Error Level	Recovery Capacity Approx. (%)
QrErrorLevel.low	7
QrErrorLevel.medium	15
QrErrorLevel.quartile	25
QrErrorLevel.high	30

Throw AssertionError if:

• size is not in range between 1 to 16.
• data in utf8.encoded format is empty.
• data in utf8.encoded format contains more than 7089 elements.

References:

• QrCode Model
• QrCode Module Size
• QrCode Error Correction Level
• QrCode Data

Implementation

void printQrCode(
  String data, {
  QrCodeModel model = QrCodeModel.model1,
  int size = 6,
  QrErrorLevel errorLevel = QrErrorLevel.low,
  PrintAlignment? alignment,
}) {
  _commands.addAll([
    if (alignment != null) SetPrintAlignment(alignment: alignment),
    PrintQrCode.setQrModel(model: model),
    PrintQrCode.setQrModuleSize(n: size),
    PrintQrCode.setErrorLevel(errorLevel: errorLevel),
    PrintQrCode.storeQrString(qrData: data),
    const PrintQrCode.printQrCode(),
  ]);
}