react-native-thermal-receipt-printer

Fork of react-native-printer and add implement for auto connect printer with usb A React Native Library to support USB/BLE/Net printer

Installation

yarn add react-native-thermal-receipt-printer

Troubleshoot

• when install in react-native version >= 0.60, xcode show this error

duplicate symbols for architecture x86_64

that because the .a library uses CocoaAsyncSocket library and Flipper uses it too

Podfile

...
  use_native_modules!

  # Enables Flipper.
  #
  # Note that if you have use_frameworks! enabled, Flipper will not work and
  # you should disable these next few lines.
  # add_flipper_pods!
  # post_install do |installer|
  #   flipper_post_install(installer)
  # end
...

and comment out code related to Flipper in ios/AppDelegate.m

Support

Printer	Android	IOS
USBPrinter	✔️
BLEPrinter	✔️	✔️
NetPrinter	✔️	✔️

Predefined tag

Tags	Description
C	Center
D	Medium font
B	Large font
M	Medium font
CM	Medium font, centered
CB	Medium font, centered
CD	Large font, centered

Development workflow

To get started with the project, run yarn bootstrap in the root directory to install the required dependencies for each package:

yarn bootstrap

While developing, you can run the example app to test your changes.

To start the packager:

yarn example start

To run the example app on Android:

yarn example dev-android

To run the example app on iOS:

yarn example ios

Usage

import {
  USBPrinter,
  NetPrinter,
  BLEPrinter,
} from "react-native-thermal-receipt-printer";

USBPrinter.printText("<C>sample text</C>");
USBPrinter.printBill("<C>sample bill</C>");

Example

USBPrinter (only support android)

interface IUSBPrinter {
  device_name: string;
  vendor_id: number;
  product_id: number;
}

  const [printers, setPrinters] = useState([]);
  const [currentPrinter, setCurrentPrinter] = useState();

  useEffect = () => {
    if(Platform.OS == 'android'){
      USBPrinter.init().then(()=> {
        //list printers
        USBPrinter.getDeviceList().then(setPrinters);
      })
    }
  }

  const _connectPrinter = (printer) => USBPrinter.connectPrinter(printer.vendorID, printer.productId).then(() => setCurrentPrinter(printer))

  const printTextTest = () => {
    currentPrinter && USBPrinter.printText("<C>sample text</C>\n");
  }

  const printBillTest = () => {
    currentPrinter && USBPrinter.printBill("<C>sample bill</C>");
  }

  ...

  return (
    <View style={styles.container}>
      {
        printers.map(printer => (
          <TouchableOpacity key={printer.device_id} onPress={() => _connectPrinter(printer)}>
            {`device_name: ${printer.device_name}, device_id: ${printer.device_id}, vendor_id: ${printer.vendor_id}, product_id: ${printer.product_id}`}
          </TouchableOpacity>
          ))
      }
      <TouchableOpacity onPress={printTextTest}>
        <Text>Print Text</Text>
      </TouchableOpacity>
      <TouchableOpacity onPress={printBillTest}>
        <Text>Print Bill Text</Text>
      </TouchableOpacity>
    </View>
  )

  ...

BLEPrinter

interface IBLEPrinter {
  device_name: string;
  inner_mac_address: string;
}

  const [printers, setPrinters] = useState([]);
  const [currentPrinter, setCurrentPrinter] = useState();

  useEffect(() => {
    BLEPrinter.init().then(()=> {
      BLEPrinter.getDeviceList().then(setPrinters);
    });
  }, []);

  _connectPrinter => (printer) => {
    //connect printer
    BLEPrinter.connectPrinter(printer.inner_mac_address).then(
      setCurrentPrinter,
      error => console.warn(error))
  }

  printTextTest = () => {
    currentPrinter && BLEPrinter.printText("<C>sample text</C>\n");
  }

  printBillTest = () => {
    currentPrinter && BLEPrinter.printBill("<C>sample bill</C>");
  }

  ...

  return (
    <View style={styles.container}>
      {
        this.state.printers.map(printer => (
          <TouchableOpacity key={printer.inner_mac_address} onPress={() => _connectPrinter(printer)}>
            {`device_name: ${printer.device_name}, inner_mac_address: ${printer.inner_mac_address}`}
          </TouchableOpacity>
          ))
      }
      <TouchableOpacity onPress={printTextTest}>
        <Text>Print Text</Text>
      </TouchableOpacity>
      <TouchableOpacity onPress={printBillTest}>
        <Text>Print Bill Text</Text>
      </TouchableOpacity>
    </View>
  )

  ...

NetPrinter

interface INetPrinter {
  device_name: string;
  host: string;
  port: number;
}

Note: get list device for net printers is support scanning in local ip but not recommended

  componentDidMount = () => {
    NetPrinter.init().then(() => {
      this.setState(Object.assign({}, this.state, {printers: [{host: '192.168.10.241', port: 9100}]}))
      })
  }

  _connectPrinter => (host, port) => {
    //connect printer
    NetPrinter.connectPrinter(host, port).then(
      (printer) => this.setState(Object.assign({}, this.state, {currentPrinter: printer})),
      error => console.warn(error))
}

  printTextTest = () => {
    if (this.state.currentPrinter) {
      NetPrinter.printText("<C>sample text</C>\n");
    }
  }

  printBillTest = () => {
    if(this.state.currentPrinter) {
      NetPrinter.printBill("<C>sample bill</C>");
    }
  }

  ...

  render() {
    return (
      <View style={styles.container}>
        {
          this.state.printers.map(printer => (
            <TouchableOpacity key={printer.device_id} onPress={(printer) => this._connectPrinter(printer.host, printer.port)}>
              {`device_name: ${printer.device_name}, host: ${printer.host}, port: ${printer.port}`}
            </TouchableOpacity>
            ))
        }
        <TouchableOpacity onPress={() => this.printTextTest()}>
          <Text> Print Text </Text>
        </TouchableOpacity>
        <TouchableOpacity onPress={() => this.printBillTest()}>
          <Text> Print Bill Text </Text>
        </TouchableOpacity>
      </View>
    )
  }

  ...