c# 生成带logo的二维码

最近做了一个生成二维码的功能，分享给朋友们，包括自定义二维码的颜色，给二维码中间添加个logo，效果如下

 

首先，调用 GetQRCode ，参数传入二维码中的信息

其次，GetQRCodeHaveLogo，给二维码添加一个logo

最后，欢迎拍砖

二维码类，需要引用ThoughtWorks.QRCode.dll

.net生成二维码名片下载事例文件

 

/// <summary>
        /// 生成二维码图片
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public static Image GetQRCode(string data)
        {
            //生成二维码 
            string qrEncoding = "Byte";
            string Level = "M";
            string txt_ver = "7";
            string txt_size = "4";

            ThoughtWorks.QRCode.Codec.QRCodeEncoder qrCodeEncoder = new ThoughtWorks.QRCode.Codec.QRCodeEncoder();
            String encoding = qrEncoding;
            if (encoding == "Byte")
            {
                qrCodeEncoder.QRCodeEncodeMode = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ENCODE_MODE.BYTE;
            }
            else if (encoding == "AlphaNumeric")
            {
                qrCodeEncoder.QRCodeEncodeMode = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
            }
            else if (encoding == "Numeric")
            {
                qrCodeEncoder.QRCodeEncodeMode = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ENCODE_MODE.NUMERIC;
            }
            try
            {
                int scale = Convert.ToInt16(txt_size);
                qrCodeEncoder.QRCodeScale = scale;
            }
            catch (Exception ex)
            {
                return null;
            }
            try
            {
                int version = Convert.ToInt16(txt_ver);
                qrCodeEncoder.QRCodeVersion = version;
            }
            catch (Exception ex)
            {
                return null;
            }
            string errorCorrect = Level;
            if (errorCorrect == "L")
                qrCodeEncoder.QRCodeErrorCorrect = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ERROR_CORRECTION.L;
            else if (errorCorrect == "M")
                qrCodeEncoder.QRCodeErrorCorrect = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ERROR_CORRECTION.M;
            else if (errorCorrect == "Q")
                qrCodeEncoder.QRCodeErrorCorrect = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ERROR_CORRECTION.Q;
            else if (errorCorrect == "H")
                qrCodeEncoder.QRCodeErrorCorrect = ThoughtWorks.QRCode.Codec.QRCodeEncoder.ERROR_CORRECTION.H;

            Image image;
            qrCodeEncoder.QRCodeForegroundColor = Color.FromArgb(242, 133, 77);//二维码颜色
            image = qrCodeEncoder.Encode(data, System.Text.Encoding.UTF8);
            var width = image.Width / 10;
            var dwidth = width * 2;
            Bitmap bmp = new Bitmap(image.Width + dwidth, image.Height + dwidth);
            Graphics g = Graphics.FromImage(bmp);
            var c = Color.FromArgb(252, 131, 54);
            g.FillRectangle(new SolidBrush(c), 0, 0, image.Width + dwidth, image.Height + dwidth);
            g.DrawImage(image, width, width);
            g.Dispose();
            image.Dispose();
            return bmp;
        }

/// <summary>
        /// 生成带logo的二维码图片
        /// </summary>
        /// <param name="imgBack">二维码图片</param>
        /// <param name="destImg">logo路径</param>
        /// <returns></returns>
        public static Image GetQRCodeHaveLogo(Image imgBack, string destImg)
        {
            Image img = Image.FromFile(destImg);
            if (img.Height != 65 || img.Width != 65)
            {
　　　　　　　　　 img = ChangeAlpha(img);
                img = KiResizeImage(img, 65, 65, 0);
            }
            Graphics g = Graphics.FromImage(imgBack);
            g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);
            g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);
            GC.Collect();
            return imgBack;
        }

/// <summary>
        /// 截取指定大小的图片
        /// </summary>
        private static Image KiResizeImage(Image bmp, int newW, int newH, int Mode)
        {
            try
            {
                Image b = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(b);
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                GraphicsPath gp = new GraphicsPath();
                gp.AddEllipse(new Rectangle(0, 0, newW, newH));
                g.SetClip(gp); //设置为圆形图片
                g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
                g.Dispose();
                return b;
            }
            catch (Exception ex)
            {
                return null;
            }
        }

       //改变图片的透明度 
        private static Image ChangeAlpha(Image image)
        {
            Bitmap img = new Bitmap(image);
            using (Bitmap bmp = new Bitmap(img.Width, img.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
            {
                using (Graphics g = Graphics.FromImage(bmp))
                {
                    g.DrawImage(img, 0, 0);
                    for (int h = 0; h <= img.Height - 1; h++)
                    {
                        for (int w = 0; w <= img.Width - 1; w++)
                        {
                            Color c = img.GetPixel(w, h);
                            int pNum = 230;
                            bmp.SetPixel(w, h, Color.FromArgb(pNum, c.R, c.G, c.B));
                        }
                    }
                    return (Image)bmp.Clone();
                }
            }
        }