Xamarin Print Image in bluetooth printer

Question

I am trying print from Bluetooth printer (INTERMEC PB51), using Xamarin native android.

I have written the code based on the below link.

How can I print an image on a Bluetooth printer in Android?

My code is below.

private static byte[] SELECT_BIT_IMAGE_MODE = { 0x1B, 0x2A, 33, (byte)255, 0 };

Making bitmap as below.

 Bitmap sigImage = BitmapFactory.DecodeResource(Resources, Resource.Drawable.icn_logo_jpg);

Creating Blutooth Socket.

  BluetoothSocket socket = null;
            BufferedReader inReader = null;
            BufferedWriter outReader = null;
            string bt_printer = address; //AdminSettings.PrinterMACAddr;
            if (string.IsNullOrEmpty(bt_printer)) bt_printer = "00:13:7B:49:D1:8C";
            BluetoothDevice mmDevice = BluetoothAdapter.DefaultAdapter.GetRemoteDevice(bt_printer);
            UUID applicationUUID = UUID.FromString("00001101-0000-1000-8000-00805F9B34FB");
            socket = mmDevice.CreateRfcommSocketToServiceRecord(applicationUUID);
            socket.Connect();

Calling method

 PrintImage(bitMap, socket);

Created method for printing it

 public void PrintImage(Bitmap bitmap, BluetoothSocket _socket)
    {
        try
        {
            if (!_socket.IsConnected)
            {
                _socket.Connect();
            }

            MemoryStream stream = new MemoryStream();

            //IMAGE
            byte[] imageData = ImageToByte2(bitmap);
            stream.Write(imageData, 0, imageData.Length);
            stream.Write(SELECT_BIT_IMAGE_MODE, 0, SELECT_BIT_IMAGE_MODE.Length);
            var bytes = stream.ToArray();
            _socket.OutputStream.Write(bytes, 0, bytes.Length);
            // Java.Lang.Thread.Sleep(2000);

            //END IMAGE
            Java.Lang.Thread.Sleep(2000);
        }
        catch (Exception ex)
        {
            throw new Exception("Unable to print. Please re-configure the printer and try again!");
        }
    }


 public static byte[] ImageToByte2(Bitmap bitmap)
    {
        MemoryStream stream = new MemoryStream();
        bitmap.Compress(Bitmap.CompressFormat.Png, 0, stream);
        byte[] bitmapData = stream.ToArray();
        return bitmapData;
    }

But getting logo printed as below image.

Answer 1

1. The Intermec PB51 can be setup with several different printer languages; IPL, Fingerprint, Direct Protocol, ZSim, DSim, CSim and ESC/P. So first you have to know which printer language you are dealing with. { 0x1B, 0x2A, 33, (byte)255, 0 } is a commnd in ESC/P, so the printer must be in ESC/P mode.

2. Looks like you are sending PNG image data to the printer. I have only used the Intermec PB51 in ESC/P mode, and in ESC/P the image has to be converted to a 1-bit image byte array (one bit per printer "pixel").