C# 生成条形码、二维码

记录一下使用ZXing生成条形码和二维码的过程，Nuget自行获取即可，就下面这个。

话不多说，直接上才艺！

1.生成条形码

        /// <summary>
        /// 生成一维条形码
        /// </summary>
        /// <param name="text">内容</param>
        /// <param name="width">宽度</param>
        /// <param name="height">高度</param>
        /// <returns></returns>
        public static Bitmap GenerateBarcode(string text, int width, int height)
        {
            BarcodeWriter writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.CODE_128;
            EncodingOptions options = new EncodingOptions()
            {
                Width = width,
                Height = height,
                Margin = 2
            };
            writer.Options = options;
            Bitmap map = writer.Write(text);
            return map;
        }

        /// <summary>
        /// 获取条形码图片中的内容
        /// </summary>
        /// <param name="picPath"></param>
        /// <returns></returns>
        public static string GetBarcodeFromPic(string picPath)
        {
            try
            {
                Bitmap img = new Bitmap(picPath);
                var decodeOption = new DecodingOptions();
                var reader = new BarcodeReader();
                reader.Options = decodeOption;
                Result result = reader.Decode(img);
                return result.ToString();
            }
            catch (Exception)
            {
                return null;
            }
        }

2.生成二维码

        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="text">内容</param>
        /// <param name="width">宽度</param>
        /// <param name="height">高度</param>
        /// <returns></returns>
        public static Bitmap GenerateQrCode(string text, int width, int height)
        {
            BarcodeWriter writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.QR_CODE;
            QrCodeEncodingOptions options = new QrCodeEncodingOptions()
            {
                DisableECI = true,
                //设置内容编码
                CharacterSet = "UTF-8",  
                //设置二维码的宽度和高度
                Width = width,
                Height = height,
                Margin = 1//设置二维码的边距,单位不是固定像素
            };

            writer.Options = options;
            Bitmap map = writer.Write(text);
            return map;
        }

        /// <summary>
        /// 生成带Logo的二维码
        /// </summary>
        /// <param name="text">内容</param>
        /// <param name="width">宽度</param>
        /// <param name="height">高度</param>
        public static Bitmap GenerateQrCodeWithLogo(string text, int width, int height)
        {
            //Logo 图片
            string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"imglogo.png";
            Bitmap logo = new Bitmap(logoPath);
            //构造二维码写码器
            MultiFormatWriter writer = new MultiFormatWriter();
            Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
            hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
            hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            //hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边

            //生成二维码 
            BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width + 30, height + 30, hint);
            bm = DeleteWhite(bm);
            BarcodeWriter barcodeWriter = new BarcodeWriter();
            Bitmap map = barcodeWriter.Write(bm);

            //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
            int[] rectangle = bm.getEnclosingRectangle();

            //计算插入图片的大小和位置
            int middleW = Math.Min((int)(rectangle[2] / 3), logo.Width);
            int middleH = Math.Min((int)(rectangle[3] / 3), logo.Height);
            int middleL = (map.Width - middleW) / 2;
            int middleT = (map.Height - middleH) / 2;

            Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
            using (Graphics g = Graphics.FromImage(bmpimg))
            {
                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                g.DrawImage(map, 0, 0, width, height);
                //白底将二维码插入图片
                g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
                g.DrawImage(logo, middleL, middleT, middleW, middleH);
            }
            return bmpimg;
        }

        /// <summary>
        /// 删除默认对应的空白
        /// </summary>
        /// <param name="matrix"></param>
        /// <returns></returns>
        private static BitMatrix DeleteWhite(BitMatrix matrix)
        {
            int[] rec = matrix.getEnclosingRectangle();
            int resWidth = rec[2] + 1;
            int resHeight = rec[3] + 1;

            BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
            resMatrix.clear();
            for (int i = 0; i < resWidth; i++)
            {
                for (int j = 0; j < resHeight; j++)
                {
                    if (matrix[i + rec[0], j + rec[1]])
                        resMatrix[i, j] = true;
                }
            }
            return resMatrix;
        }