Error: [TypeError: Cannot read property 'target' of undefined]

[davmaene]

when I try to run the function to print, an error occurs telling me that Error: [TypeError: Cannot read property 'target' of undefined] and when i try to console the printers variable it returns me an empty array here is my code

const PrintPOS = async () => {
        try {
            const printers = await EscPosPrinter.discover()

            const printer = printers[0]

            console.log(printers);

            await EscPosPrinter.init({
                target: printer.target,
                seriesName: getPrinterSeriesByName(printer.name),
                language: 'EPOS2_LANG_EN',
            })

            const printing = new EscPosPrinter.printing();

            const status = await printing
              .initialize()
              .align('center')
              .size(3, 3)
              .line('DUDE!')
              .smooth()
              .line('DUDE!')
              .smooth()                
              .size(1, 1)
              .text('is that a ')
              .bold()
              .underline()
              .text('printer?')
              .bold()
              .underline()
              .newline(2)
              .align('center')
            //   .image(image, 200)
              .barcode({
                value:'Test123',
                type:'EPOS2_BARCODE_CODE93',
                hri:'EPOS2_HRI_BELOW',
                width:2,
                height:50,
              })
              .qrcode({
                value: 'Test123',
                level: 'EPOS2_LEVEL_M',
                width: 5,
              })
              .cut()
              .addPulse()
              .send()

              console.log('Success:', status)

        } catch(e) {
              console.log('Error:', e)
        }
    }

i also add this req. permission to my android/app/src/main/AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

[ArifSanaullah]

when I try to run the function to print, an error occurs telling me that Error: [TypeError: Cannot read property 'target' of undefined] and when i try to console the printers variable it returns me an empty array here is my code

const PrintPOS = async () => {
        try {
            const printers = await EscPosPrinter.discover()

            const printer = printers[0]

            console.log(printers);

            await EscPosPrinter.init({
                target: printer.target,
                seriesName: getPrinterSeriesByName(printer.name),
                language: 'EPOS2_LANG_EN',
            })

            const printing = new EscPosPrinter.printing();

            const status = await printing
              .initialize()
              .align('center')
              .size(3, 3)
              .line('DUDE!')
              .smooth()
              .line('DUDE!')
              .smooth()                
              .size(1, 1)
              .text('is that a ')
              .bold()
              .underline()
              .text('printer?')
              .bold()
              .underline()
              .newline(2)
              .align('center')
            //   .image(image, 200)
              .barcode({
                value:'Test123',
                type:'EPOS2_BARCODE_CODE93',
                hri:'EPOS2_HRI_BELOW',
                width:2,
                height:50,
              })
              .qrcode({
                value: 'Test123',
                level: 'EPOS2_LEVEL_M',
                width: 5,
              })
              .cut()
              .addPulse()
              .send()

              console.log('Success:', status)

        } catch(e) {
              console.log('Error:', e)
        }
    }

i also add this req. permission to my android/app/src/main/AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

Got the same error in a new react-native project. Any solution so far?

[davmaene]

yes, I already have a solution, thank you very much

[DenisFjordfox]

@davmaene What's your solution?

[davmaene]

1 : you must first make sure that the bluetooth connection is activated. 2 : then you need to make sure there are bluetooth devices ( your printer is on ) 3 : but if the problem persists I advise you to use this other module (react-native-pos-printer) this one work well

here there are some lines of code that i had used in a project

import * as React from 'react';
import { View, Text, TouchableHighlight, Image } from 'react-native';
import { FooterScreen } from '../../components/Footer/FooterComponent';
import { Head } from '../../components/Head/HeadComponent';
import { Consts } from '../../assets/scripts/AppConstants';
import CheckBox from 'react-native-check-box';
import RNPosPrinter from 'react-native-pos-printer';
import Ionicons from 'react-native-vector-icons/Ionicons';
import { ScrollView } from 'react-native-gesture-handler';

export const PrinterScreen = ({navigation, route}) => {

    const [permi, setpermi] = React.useState(false);
    const [vignete, setvignet] = React.useState(false);
    const [rose, setrose] = React.useState(false);
    const [ass, setass] = React.useState(false);
    const [elec, setelect] = React.useState(false);

    let infos = null;
    let infractions = null;

    if(route && route['params'] && route['params']['infos']) infos = route['params']['infos'];
    if(route && route['params'] && route['params']['infractions']) infractions = route['params']['infractions'];

    const PrintPOS = async () => {
        try {
            RNPosPrinter.init(true).then(d => {
                console.log("done");
            })
            .catch(e => {
                console.log("error ");
            })
            RNPosPrinter.getDevices().then(d => {
                console.log("done getting devices", d);
            })
            .catch(er => {
                console.error("error", er);
            })
            RNPosPrinter.scanDevices((e) => {
                console.error(e);
            })
            RNPosPrinter.printTestReceipt("david maene");

        } catch(e) {
            console.error(e);
        }
    }

    return(
        <>
           .....
           ....
           ....
        </>
   )
}

[DenisFjordfox]

@tr3v3r Do you have any thoughts about it?

[tr3v3r]

@DenisFjordfox hi! Could you please share more info. platform, lib version, Android version, iOS version, printer model, type of connection (lan, Bluetooth and etc.)

[DenisFjordfox]

@tr3v3r I'm using the latest lib version - 1.11.0.

Printer: Epson TM-P80 via bluetooth Device: Galaxy A51, Android 11 React Native: 0.63.4

[tr3v3r]

@DenisFjordfox have you added this permission?

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION

[DenisFjordfox]

@tr3v3r Yeah. Permissions are the following:

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

[tr3v3r]

@DenisFjordfox have you tried to increase scanningTimeoutAndroid ? Is you printer properly been configured? I mean have you tried to print something using another software?

[DenisFjordfox]

@tr3v3r Yeah, was setting timeout to bigger values, but the issue persists. I have only one printer available, so cannot check it properly. I think, that I'll try to setup the library on a bare RN project to check the behavior

[tr3v3r]

@DenisFjordfox I’m asked not about another printer but about another software to connect and print on your TM-P80 printer. I.e. did you manage to print something from pc via Bluetooth connection?