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Print failed when using USB connection

See original GitHub issue

I am creating an image and print it via this library, when I am using the Bluetooth connection everything is okay and print without any problem, but when I change the connection type to USB, the print failed as the attached image shows (it doesn’t even cut the paper). The code using to create image and print are the same and just the connection is different, I am wondering what is the problem and should I set anything special for the USB connection?

                    val connection = when (printer.type) {
                        PrinterType.Bluetooth -> {
                            val bluetoothDevice = bluetoothAdapter?.getRemoteDevice(printer.address)
                        PrinterType.Wifi -> {
                            TcpConnection(printer.address, printer.port)
                        PrinterType.USB -> {
                            UsbConnections(context).list?.find { connection ->
                                printer.address == connection.device.deviceName &&
                                        printer.vendorId == connection.device.vendorId &&
                                        printer.productId == connection.device.productId
                    } ?: throw Exception("Cannot connect to the printer (${})")
                    var escPosPrinter: EscPosPrinter? = null
                    try {
                        escPosPrinter = EscPosPrinter(connection, 201, 72f, 48)
                        val textToPrint = StringBuilder()
                        var y = 0
                        while (y < height) {
                            val bitmap = Bitmap.createBitmap(
                                if (y + 256 >= height) height - y else 256
                            y += 256
                        textToPrint.append("[C]<qrcode size='20'>")
                        textToPrint.append("[C]All Rights Reserved\n")
                    } catch (e: EscPosConnectionException) {
                        showMessage("Cannot connect to the printer (${})")
                    } catch (ex: Exception) {
                    } finally {

photo_2021-09-08 20 51 04

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:14 (3 by maintainers)

github_iconTop GitHub Comments

iAmAndroidDevelopercommented, Sep 13, 2021

Ok NP @MMohamad70 let you know tomorrow morning

AtiaDjabercommented, Oct 17, 2021

same with me i test DrawReceipt and xml to generate bitmap but failed print correctly

Read more comments on GitHub >

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