FactoryDataToPrintService.cs

using Inovadora.GVIS.Services.Interfaces;
using System.Text;

namespace Inovadora.GVIS.Services
{
    //
    // Summary:
    //     /// Classe responsável pelo service. ///
    //     https://www.activeplus.com/products/ethernet-pos/samples/cs-tcpip
    //     https://liana-ali.blogspot.com/2018/09/escpos-print-qr-code-in-receipt.html
    //
    public class FactoryDataToPrintService : IFactoryDataToPrintService
    {
        const char ESC = '\x1b';
        const char FS = '\x1c';
        const char GS = '\x1d';

        string ENABLE_ALIGN_CENTER = ESC + "a" + (char)1;
        string DISABLE_ALIGN_CENTER = ESC + "a" + (char)0;
        string ENABLE_BOLD = ESC + "E" + (char)1;
        string DISABLE_BOLD = ESC + "E" + (char)0;

        public byte[] Factory()
        {
            StringBuilder builder = new StringBuilder(ESC + "@");

            builder.Append(ENABLE_ALIGN_CENTER);
            builder.Append(ENABLE_BOLD);

            builder.Append("G-VIS\n");
            builder.Append("www.inovadora.com.br\n\n");

            builder.Append(DISABLE_ALIGN_CENTER);
            builder.Append(DISABLE_BOLD);

            builder.Append("This sample text is sent from a C# program\n");

            string QrData = "www.inovadora.com.br";

            string builderQrCode = string.Empty;

            Encoding m_encoding = Encoding.GetEncoding("iso-8859-1");

            int store_len = (QrData).Length + 3;
            byte store_pL = (byte)(store_len % 256);
            byte store_pH = (byte)(store_len / 256);

            builderQrCode += m_encoding.GetString(new byte[] { 29, 40, 107, 4, 0, 49, 65, 50, 0 });
            builderQrCode += m_encoding.GetString(new byte[] { 29, 40, 107, 3, 0, 49, 67, 8 });
            builderQrCode += m_encoding.GetString(new byte[] { 29, 40, 107, 3, 0, 49, 69, 48 });
            builderQrCode += m_encoding.GetString(new byte[] { 29, 40, 107, store_pL, store_pH, 49, 80, 48 });
            builderQrCode += QrData;
            builderQrCode += m_encoding.GetString(new byte[] { 29, 40, 107, 3, 0, 49, 81, 48 });

            builder.Append(ENABLE_ALIGN_CENTER);

            builder.Append(builderQrCode);

            builder.Append(DISABLE_ALIGN_CENTER);

            // Feed and cut paper
            builder.Append(GS + "V\x41\0");

            return Encoding.Default.GetBytes(builder.ToString());
        }
    }
}