Sample code sharing using C# to generate QR code with logo

The generation of QR code with logo is divided into two steps: first, generate a QR code image based on the input content, then read the local logo image, and generate a QR code with logo through image processing. This article introduces this and has a very good reference value. Let’s take a look at it with the editor.

The generation of QR code with logo is divided into two steps: first, generate a QR code image based on the input content. , then read the local logo image and generate a QR code with the logo through image processing.

The effect of the generated QR code is as follows:

#The QR code generation class QRCodeHelper.cs is directly posted below, and the CreateQRCodeWithLogo method is directly called and the corresponding The parameter returns bitmap type data, and directly binds the returned data to the picturecontrol. If it is a web, you can first save the picture to the specified address of the server and then obtain the display

/// <summary>
 /// 生成带logo二维码
 /// </summary>
 public class QRCodeHelper
 {/// <summary>
  /// 创建二维码
  /// </summary>
  /// <param name="content"></param>
  /// <param name="size"></param>
  /// <returns></returns>
  public static Bitmap Create(string content)
  {
   try
   {
    //var options = new QrCodeEncodingOptions
    //{
    // DisableECI = true,
    // CharacterSet = "UTF-8",
    // Width = size,
    // Height = size,
    // Margin = 0,
    // ErrorCorrection = ErrorCorrectionLevel.H
    //};
    //var writer = new BarcodeWriter();
    //writer.Format = BarcodeFormat.QR_CODE;
    //writer.Options = options;
    //var bmp = writer.Write(content);
    //return bmp;
    QRCodeEncoder qRCodeEncoder = new QRCodeEncoder();
    qRCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//设置二维码编码格式 
    qRCodeEncoder.QRCodeScale = 4;//设置编码测量度    
    qRCodeEncoder.QRCodeVersion = 7;//设置编码版本 
    qRCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//设置错误校验 
    Bitmap image = qRCodeEncoder.Encode(content);
    return image;
   }
   catch (Exception ex)
   {
    return null;
   }
  }
  /// <summary>
  /// 获取本地图片
  /// </summary>
  /// <param name="fileName"></param>
  /// <returns></returns>
  private static Bitmap GetLocalLog(string fileName)
  {
   Bitmap newBmp = new Bitmap(fileName);
   //Bitmap bmp = new Bitmap(newBmp);
   return newBmp;
  }
  /// <summary>
  /// 生成带logo二维码
  /// </summary>
  /// <returns></returns>
  public static Bitmap CreateQRCodeWithLogo(string content, string logopath)
  {
   //生成二维码
   Bitmap qrcode = Create(content);
   //生成logo
   Bitmap logo = GetLocalLog(logopath);
   ImageUtility util = new ImageUtility();
   Bitmap finalImage = util.MergeQrImg(qrcode, logo);
   return finalImage;
  }
 }

The following is an image processing class found on the Internet ImageUtility.cs

public class ImageUtility
 {
  #region 合并用户QR图片和用户头像
  /// <summary>
  /// 合并用户QR图片和用户头像
  /// </summary>
  /// <param name="qrImg">QR图片</param>
  /// <param name="headerImg">用户头像</param>
  /// <param name="n"></param>
  /// <returns></returns>
  public Bitmap MergeQrImg(Bitmap qrImg, Bitmap headerImg, double n = 0.23)
  {
   int margin = 10;
   float dpix = qrImg.HorizontalResolution;
   float dpiy = qrImg.VerticalResolution;
   var _newWidth = (10 * qrImg.Width - 36 * margin) * 1.0f / 36;
   var _headerImg = ZoomPic(headerImg, _newWidth / headerImg.Width);
   //处理头像
   int newImgWidth = _headerImg.Width + margin;
   Bitmap headerBgImg = new Bitmap(newImgWidth, newImgWidth);
   headerBgImg.MakeTransparent();
   Graphics g = Graphics.FromImage(headerBgImg);
   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
   g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
   g.Clear(Color.Transparent);
   Pen p = new Pen(new SolidBrush(Color.White));
   Rectangle rect = new Rectangle(0, 0, newImgWidth - 1, newImgWidth - 1);
   using (GraphicsPath path = CreateRoundedRectanglePath(rect, 1))
   {
    g.DrawPath(p, path);
    g.FillPath(new SolidBrush(Color.White), path);
   }
   //画头像
   Bitmap img1 = new Bitmap(_headerImg.Width, _headerImg.Width);
   Graphics g1 = Graphics.FromImage(img1);
   g1.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
   g1.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
   g1.Clear(Color.Transparent);
   Pen p1 = new Pen(new SolidBrush(Color.Gray));
   Rectangle rect1 = new Rectangle(0, 0, _headerImg.Width - 1, _headerImg.Width - 1);
   using (GraphicsPath path1 = CreateRoundedRectanglePath(rect1, 1))
   {
    g1.DrawPath(p1, path1);
    TextureBrush brush = new TextureBrush(_headerImg);
    g1.FillPath(brush, path1);
   }
   g1.Dispose();
   PointF center = new PointF((newImgWidth - _headerImg.Width) / 2, (newImgWidth - _headerImg.Height) / 2);
   g.DrawImage(img1, center.X, center.Y, _headerImg.Width, _headerImg.Height);
   g.Dispose();
   Bitmap backgroudImg = new Bitmap(qrImg.Width, qrImg.Height);
   backgroudImg.MakeTransparent();
   backgroudImg.SetResolution(dpix, dpiy);
   headerBgImg.SetResolution(dpix, dpiy);
   Graphics g2 = Graphics.FromImage(backgroudImg);
   g2.Clear(Color.Transparent);
   g2.DrawImage(qrImg, 0, 0);
   PointF center2 = new PointF((qrImg.Width - headerBgImg.Width) / 2, (qrImg.Height - headerBgImg.Height) / 2);
   g2.DrawImage(headerBgImg, center2);
   g2.Dispose();
   return backgroudImg;
  }
  #endregion
  #region 图形处理
  /// <summary>
  /// 创建圆角矩形
  /// </summary>
  /// <param name="rect">区域</param>
  /// <param name="cornerRadius">圆角角度</param>
  /// <returns></returns>
  private GraphicsPath CreateRoundedRectanglePath(Rectangle rect, int cornerRadius)
  {
   //下午重新整理下，圆角矩形
   GraphicsPath roundedRect = new GraphicsPath();
   roundedRect.AddArc(rect.X, rect.Y, cornerRadius * 2, cornerRadius * 2, 180, 90);
   roundedRect.AddLine(rect.X + cornerRadius, rect.Y, rect.Right - cornerRadius * 2, rect.Y);
   roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y, cornerRadius * 2, cornerRadius * 2, 270, 90);
   roundedRect.AddLine(rect.Right, rect.Y + cornerRadius * 2, rect.Right, rect.Y + rect.Height - cornerRadius * 2);
   roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y + rect.Height - cornerRadius * 2, 
   cornerRadius * 2, cornerRadius * 2, 0, 90);
   roundedRect.AddLine(rect.Right - cornerRadius * 2, rect.Bottom, rect.X + cornerRadius * 2, rect.Bottom);
   roundedRect.AddArc(rect.X, rect.Bottom - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 90, 90);
   roundedRect.AddLine(rect.X, rect.Bottom - cornerRadius * 2, rect.X, rect.Y + cornerRadius * 2);
   roundedRect.CloseFigure();
   return roundedRect;
  }
  /// <summary>
  /// 图片按比例缩放
  /// </summary>
  private Image ZoomPic(Image initImage, double n)
  {
   //缩略图宽、高计算
   double newWidth = initImage.Width;
   double newHeight = initImage.Height;
   newWidth = n * initImage.Width;
   newHeight = n * initImage.Height;
   //生成新图
   //新建一个bmp图片
   System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);
   //新建一个画板
   System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);
   //设置质量
   newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
   newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
   //置背景色
   newG.Clear(Color.Transparent);
   //画图
   newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), 
   new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);
   newG.Dispose();
   return newImage;
  }
  /// <summary>
  /// 创建缩略图
  /// </summary>
  /// <param name="b"></param>
  /// <param name="destHeight"></param>
  /// <param name="destWidth"></param>
  /// <returns></returns>
  public static Bitmap GetThumbnail(Bitmap b, int destHeight, int destWidth)
  {
   System.Drawing.Image imgSource = b;
   System.Drawing.Imaging.ImageFormat thisFormat = imgSource.RawFormat;
   int sW = 0, sH = 0;
   // 按比例缩放 
   int sWidth = imgSource.Width;
   int sHeight = imgSource.Height;
   if (sHeight > destHeight || sWidth > destWidth)
   {
    if ((sWidth * destHeight) > (sHeight * destWidth))
    {
     sW = destWidth;
     sH = (destWidth * sHeight) / sWidth;
    }
    else
    {
     sH = destHeight;
     sW = (sWidth * destHeight) / sHeight;
    }
   }
   else
   {
    sW = sWidth;
    sH = sHeight;
   }
   Bitmap outBmp = new Bitmap(destWidth, destHeight);
   Graphics g = Graphics.FromImage(outBmp);
   g.Clear(Color.Transparent);
   // 设置画布的描绘质量 
   g.CompositingQuality = CompositingQuality.HighQuality;
   g.SmoothingMode = SmoothingMode.HighQuality;
   g.InterpolationMode = InterpolationMode.HighQualityBicubic;
   g.DrawImage(imgSource, new Rectangle((destWidth - sW) / 2, (destHeight - sH) / 2, sW, sH), 0, 0, 
   imgSource.Width, imgSource.Height, GraphicsUnit.Pixel);
   g.Dispose();
   // 以下代码为保存图片时，设置压缩质量 
   EncoderParameters encoderParams = new EncoderParameters();
   long[] quality = new long[1];
   quality[0] = 100;
   EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
   encoderParams.Param[0] = encoderParam;
   imgSource.Dispose();
   return outBmp;
  }
  #endregion
 }

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