egwcorelib/EgwCoreLib.Razor/BCodeUtils.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.IO;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;
using System.Drawing.Imaging;
using System.Drawing;
using ZXing.Rendering;
using System.Data;

namespace EgwCoreLib.Razor
{
    /// <summary>
    /// Classe gestione rendering QRCode, da XZing
    /// 
    /// https://github.com/micjahn/ZXing.Net/
    /// https://stackoverflow.com/questions/72114518/show-an-image-stream-to-client-in-blazor-server-without-javascript
    /// 
    /// valutare output SVG
    /// https://www.nayuki.io/page/qr-code-generator-library#third-party-ports
    /// https://github.com/manuelbl/QrCodeGenerator
    /// https://github.com/manuelbl/QrCodeGenerator/blob/master/Demo-ASP.NET-Core/QrCodeController.cs
    /// </summary>
    public class BCodeUtils
    {
        /// <summary>
        /// Genera immagina barcode richiesta secondo dimensioni e formato
        /// </summary>
        /// <param name="dataStr"></param>
        /// <param name="hSize">altezza</param>
        /// <param name="formato">formati 1D di ZXing</param>
        /// <param name="pureBarcode">indica se SOLO barcode</param>
        /// <param name="forceUpper">indica se forzare i caratteri a maiuscolo</param>
        /// <returns></returns>
        public static Stream getImage(string dataStr, int hSize, BarcodeFormat formato, bool pureBarcode, bool forceUpper)
        {
            // se vuoto steamware...
            if (dataStr == null || dataStr == "")
            {
                dataStr = "www.steamware.net";
            }
            if(forceUpper)
            {
            dataStr = dataStr.ToUpper();
            }
            // url decode...
            dataStr = HttpUtility.UrlDecode(dataStr);
            // creo!
            EncodingOptions options = new EncodingOptions
            {
                Height = hSize,
                Margin = 0,
                PureBarcode = pureBarcode
            };
            var writer = new ZXing.Windows.Compatibility.BarcodeWriter()
            {
                Format = formato,
                Options = options
            };
            //writer.Format = formato;
            //writer.Options = options;
            // scrivo bitmap
            Bitmap pixelData = writer.Write(dataStr);

            // Return Image
            MemoryStream ms = new MemoryStream();
            pixelData.Save(ms, ImageFormat.Png);
            ms.Position = 0;
            return ms;
            //return new FileStreamResult(ms, "image/png");
        }
        /// <summary>
        /// Genera immagina barcode richiesta secondo dimensioni e formato
        /// </summary>
        /// <param name="dataStr"></param>
        /// <param name="hSize">altezza</param>
        /// <param name="wSize"></param>
        /// <param name="formato">formati 1D di ZXing</param>
        /// <param name="forceUpper">indica se forzare i caratteri a maiuscolo</param>
        /// <returns></returns>
        public static Stream getImage2D(string dataStr, int hSize, int wSize, BarcodeFormat formato, bool forceUpper)
        {
            // se vuoto steamware...
            if (dataStr == null || dataStr == "")
            {
                dataStr = "www.egalware.com";
            }
            if (forceUpper)
            {
                dataStr = dataStr.ToUpper();
            }
            // url decode...
            dataStr = HttpUtility.UrlDecode(dataStr);
            // creo!
            QrCodeEncodingOptions options = new QrCodeEncodingOptions
            {
                DisableECI = true,
                CharacterSet = "UTF-8",
                Width = wSize,
                Height = hSize,
                Margin = 0
            };
            var writer = new ZXing.Windows.Compatibility.BarcodeWriter()
            {
                Format = formato,
                Options = options
            };
            // svrivo svg...
            var svgImage = writer.Write(dataStr);
            // scrivo bitmap
            Bitmap pixelData = writer.Write(dataStr);

            // Return Image
            MemoryStream ms = new MemoryStream();
            pixelData.Save(ms, ImageFormat.Png);
            ms.Position = 0;
            return ms;
            //return new FileStreamResult(ms, "image/png");
        }
    }
}