@intechnity/react-native-thermal-printer

Fork of react-native-thermal-receipt-printer with added support for locales and QR Code Printing.

react-native-thermal-receipt-printer

Predefined tags

Tags	Description
Text	Prints normal text
NewLine	Feed
QRCode	Prints QR Code

Text

<Text align="center" fontWidth="1" fontHeight="1">Example text</Text>

Supported attributes:

Attribute	Description
font	Font type, values: 0 - ? (Research required)
align	Align text, values: left, center, right
fontWidth	Font width, values: 0 - 4
fontHeight	Font height, values: 0 - 4
bold	Bold, values: 0 - 1
base64	If base64 encoded, values: 0 - 1

NewLine

<NewLine />

QRCode

<QRCode version='0' errorCorrectionLevel='3' magnification='6'>http://example.com</QRCode>

Supported attributes:

Attribute	Description
version	Code type, values: 0 - 19
errorCorrectionLevel	Error correction level, values: 0 - 3
magnification	Magnification, values: 1 - 8

IPrintOptions

IPrintOptions is an interface that provides various options you can use for a print job when working with the @intechnity/react-native-thermal-printer library.

Options

beep

• Type: boolean

The beep option triggers the printer to make a beep sound when the print job is complete, if the printer supports this feature. Default: false.

cut

• Type: boolean

The cut option will command the printer to automatically cut the paper after the print job, if the printer supports this feature. Default: false.

tailingLine

• Type: boolean

The tailingLine option instructs the printer to print an extra blank line at the end of the print job. Default: false.

encoding

• Type: string

The encoding option sets the character encoding for the print job. The default is UTF-8. You should set this to match the encoding of the data you're sending. Incorrect encoding could result in garbled output.

codepage

• Type: number

The codepage option specifies the code page that the printer should use to print the job. A code page is a table of characters that the printer uses to print text. Different code pages include different characters, so you should select the code page that includes all the characters you need.

Usage

import {
  IBLEPrinterIdentity,
  BLEPrinter,
} from "@intechnity/react-native-thermal-printer";

await BLEPrinter.init();
const devices = await BLEPrinter.getDeviceList();
await BLEPrinter.connectPrinter(devices[0].innerMacAddress);

const options: IPrintOptions = {
  beep: true,
  cut: true,
  tailingLine: true,
  encoding: 'UTF-8',
  codepage: 0,
};

BLEPrinter.print(`
<Printout>
  <Text align='center' fontWidth='1' fontHeight='1'>Example text</Text>
  <NewLine />
  <Text align='right' fontWidth='1' fontHeight='1' bold='0'>Second line</Text>
</Printout>`, options);

Example

USBPrinter (only supported on android)

  import {
    USBPrinter,
    IUSBPrinterIdentity
  } from '@intechnity/react-native-thermal-printer';

  ...

  type State = {
    printers: IUSBPrinterIdentity[];
    currentPrinter: IUSBPrinterIdentity;
  }

  ...

  async componentDidMount() {
    if (Platform.OS == "android") {
      await USBPrinter.init();
      var availablePrinters = await USBPrinter.getDeviceList();

      this.setState({
        printers: availablePrinters
      });
    }
  }

  async connectPrinter(printer: IUSBPrinterIdentity) {
    await USBPrinter.connectPrinter(printer.vendorId, printer.productId);

    this.setState({
      currentPrinter: printer
    });
  }

  print() {
    USBPrinter.print(`
<Printout>
  <Text align='center' fontWidth='1' fontHeight='1'>Example text</Text>
  <NewLine />
  <Text align='right' fontWidth='1' fontHeight='1' bold='0'>Second line</Text>
</Printout>`);
  }
  
  getPrinterDescription(printer: IUSBPrinterIdentity) {
    return `deviceName: ${printer.deviceName}, vendorId: ${printer.vendorId}, productId: ${printer.productId}`;
  }
  ...

  return (
    <View style={styles.container}>
      {
        this.state.printers.map(printer => (
          <TouchableOpacity key={printer.deviceName} onPress={() => this.connectPrinter(printer)}>
            <Text>{this.getPrinterDescription(printer)}</Text>
          </TouchableOpacity>
        ))
      }
      <Button title='Print' onPress={() => this.print()} />
    </View>
  )

  ...

BLEPrinter

  import {
    BLEPrinter,
    IBLEPrinterIdentity
  } from '@intechnity/react-native-thermal-printer';

  ...

  type State = {
    printers: IBLEPrinterIdentity[];
    currentPrinter: IBLEPrinterIdentity;
  }

  ...

  async componentDidMount() {
    await BLEPrinter.init();
    var availablePrinters = await BLEPrinter.getDeviceList();

    this.setState({
      printers: availablePrinters
    });
  }

  async connectPrinter(printer: IBLEPrinterIdentity) {
    await BLEPrinter.connectPrinter(printer.innerMacAddress);

    this.setState({
      currentPrinter: printer
    });
  }

  print() {
    BLEPrinter.print(`
<Printout>
  <Text align='center' fontWidth='1' fontHeight='1'>Example text</Text>
  <NewLine />
  <Text align='right' fontWidth='1' fontHeight='1' bold='0'>Second line</Text>
</Printout>`);
  }

  getPrinterDescription(printer: IBLEPrinterIdentity) {
    return `deviceName: ${printer.deviceName}, innerMacAddress: ${printer.innerMacAddress}`;
  }

  ...

  return (
    <View style={styles.container}>
      {
        this.state.printers.map(printer => (
          <TouchableOpacity key={printer.deviceName} onPress={() => this.connectPrinter(printer)}>
            <Text>{this.getPrinterDescription(printer)}</Text>
          </TouchableOpacity>
        ))
      }
      <Button title='Print' onPress={() => this.print()} />
    </View>
  )

  ...

NetPrinter

Note: getDeviceList does support scanning in local network, but is not recommended

  import {
    NetPrinter,
    INetPrinterIdentity
  } from '@intechnity/react-native-thermal-printer';

  ...

  type State = {
    printers: INetPrinterIdentity[];
    currentPrinter: INetPrinterIdentity;
  }

  ...

  async componentDidMount() {
    await NetPrinter.init();
    var availablePrinters: INetPrinterIdentity[] = [{ deviceName: 'test', host: '192.168.1.1', port: 9100 }];

    this.setState({
      printers: availablePrinters
    });
  }

  async connectPrinter(printer: INetPrinterIdentity) {
    printer = await NetPrinter.connectPrinter(printer.host, printer.port);

    this.setState({
      currentPrinter: printer
    });
  }

  print() {
    NetPrinter.print(`
<Printout>
  <Text align='center' fontWidth='1' fontHeight='1'>Example text</Text>
  <NewLine />
  <Text align='right' fontWidth='1' fontHeight='1' bold='0'>Second line</Text>
</Printout>`);
  }

  getPrinterDescription(printer: INetPrinterIdentity) {
    return `deviceName: ${printer.deviceName}, host: ${printer.host}, port: ${printer.port}`;
  }

  ...

  return (
    <View style={styles.container}>
      {
        this.state.printers.map(printer => (
          <TouchableOpacity key={printer.deviceName} onPress={() => this.connectPrinter(printer)}>
            <Text>{this.getPrinterDescription(printer)}</Text>
          </TouchableOpacity>
        ))
      }
      <Button title='Print' onPress={() => this.print()} />
    </View>
  )

  ...

TODO

• Supported font types
• Supported QR codes