How To Print QRCode in Thermal Printer

Question

Hi, can anyone help me with this situation? I'm in need of help printing a QR code using Xamarin.Forms (iOS and Android) (I just need the Android version).

I have an Thermal Printer, and im already printing text through the BluetoothSocket, and i can print QRCodes, but only small QRCodes, if i print a QRCode with more than X characters it will send a QRCode that is not well formated and the camera can't read it. Here's the code that i have so far.

var byteslist = new List<byte>();

                            byte[] qrBytes = System.Text.Encoding.ASCII.GetBytes(qrcode);
                            int dataLength = qrBytes.Length + 3;
                            byte dataPL = (byte)(dataLength % 256);
                            byte dataPH = (byte)(dataLength / 256);
                            var bytes = new List<byte>();

                        bytes.AddRange(new byte[] { 0x1D, 0x28, 0x6b, 0x04, 0x00, 0x31, 0x41, 0x33, 0x00 });
                        bytes.AddRange(new byte[] { 0x1D, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x43, 0x05 });
                        bytes.AddRange(new byte[] { 0x1D, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x45, 0x30 }); 
                        bytes.AddRange(new byte[] { 0x1D, 0x28, 0x6B, dataPL, dataPH, 0x31, 0x50, 0x30 }); 
                        bytes.AddRange(qrBytes);
                        bytes.AddRange(new byte[] { 0x1D, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x51, 0x30 });


                            await socket.OutputStream.WriteAsync(bytes.ToArray(), 0, bytes.Count);
                            socket.Close();

Answer 1

do you have Github repo of your code?