I am trying to print a PDF to a thermal printer via Bluetooth connection in Xamarin Forms.Print text only works correctly. But when I send the PDF it prints with strange symbols.I don't know much about thermal printers, but I would appreciate any help.
This is the method that creates the PDF
public byte[] Invoice(){ using (MemoryStream stream = new MemoryStream()) { //Creamos instancia de los objetos necesarios para construir la estructura del PDF PdfWriter writer = new PdfWriter(stream); PdfDocument pdf = new PdfDocument(writer); Document document = new Document(pdf, PageSize.A4); document.SetMargins(2, 2, 2, 2); PdfFont font = PdfFontFactory.CreateFont(iText.IO.Font.Constants.StandardFonts.HELVETICA); PdfFont fontTitulo = PdfFontFactory.CreateFont(iText.IO.Font.Constants.StandardFonts.TIMES_ROMAN); //Datos de la empresa, factura y del cliente a mostrar Paragraph cabecera = new Paragraph("FACTURA").SetHorizontalAlignment(HorizontalAlignment.CENTER).SetTextAlignment(TextAlignment.CENTER).SetFontSize(11); Paragraph saltoLinea = new Paragraph(new Text("\n")); string dataQR = "395410026|0|0|0|0|0"; byte[] qr = generaQR(dataQR); ImageData imageDataQR = ImageDataFactory.Create(qr); iText.Layout.Element.Image imageQR = new iText.Layout.Element.Image(imageDataQR).ScaleToFit(80f, 80f); document.Add(cabecera); document.Add(saltoLinea); document.Add(imageQR); document.Close(); byte[] pdfBytes = stream.ToArray(); return pdfBytes; }}And this is the way I send to the thermal printer
public async Task Print(string deviceName, byte[] pdfBytes){ using (BluetoothAdapter bluetoothAdapter = BluetoothAdapter.DefaultAdapter) { BluetoothDevice device = (from bd in bluetoothAdapter?.BondedDevices where bd?.Name == deviceName select bd).FirstOrDefault(); try { using (BluetoothSocket bluetoothSocket = device?. CreateRfcommSocketToServiceRecord( UUID.FromString("00001101-0000-1000-8000-00805f9b34fb"))) { bluetoothSocket?.Connect(); bluetoothSocket?.OutputStream.Write(pdfBytes, 0, pdfBytes.Length); bluetoothSocket.Close(); } } catch (Exception ex) { throw ex; } }}
