C#运用QRCode生成二维码

来源：互联网发布：linux开源项目编辑：程序博客网时间：2024/05/22 02:17

在现在的项目中，较多的使用到二维码，现在介绍一个第三方组件，用于生成二维码。

生成二维码：

        /// <summary>        /// 生成二维码        /// </summary>        /// <param name="content">带生成二维码的字符串</param>        /// <param name="path">路径</param>        /// <returns></returns>        public static string CreatehoughtWorksQrCode(string content, string path)        {            if (string.IsNullOrEmpty(content))            {                throw new ArgumentNullException(content);            }            if (string.IsNullOrEmpty(path))            {                throw new ArgumentNullException(path);            }            var qrCodeEncoder = new QRCodeEncoder            {                QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE,                QRCodeScale = 4,                QRCodeVersion = 8,                QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M            };            Image image = qrCodeEncoder.Encode(content);            var filename = DateTime.Now.ToString("yyyymmddhhmmssfff") + ".jpg";            var filepath = string.Format("{0}{1}", path, filename);            FileStream fs = null;            try            {                fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write);                image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);            }            catch (IOException ex)            {                throw new IOException(ex.Message);            }            finally            {                if (fs != null) fs.Close();                image.Dispose();            }            return CodeDecoder(filepath);        }

2.解析二维码：

        /// <summary>        /// 二维码解码        /// </summary>        /// <param name="filePath">图片路径</param>        /// <returns></returns>        public static string CodeDecoder(string filePath)        {            if (string.IsNullOrEmpty(filePath))            {                throw new ArgumentNullException(filePath);            }            try            {                if (!System.IO.File.Exists(filePath))                    return null;                var myBitmap = new Bitmap(Image.FromFile(filePath));                var decoder = new QRCodeDecoder();                var decodedString = decoder.decode(new QRCodeBitmapImage(myBitmap));                return decodedString;            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }        }

3.选择生成的二维码参数：

        /// <summary>        /// 选择生成二维码的相关类型        /// <param name="strData">要生成的文字或者数字，支持中文。如： "4408810820 深圳－广州" 或者：4444444444</param>        /// <param name="qrEncoding">三种尺寸：BYTE ，ALPHA_NUMERIC，NUMERIC</param>        /// <param name="level">大小：L M Q H</param>        /// <param name="version">版本：如 8</param>        /// <param name="scale">比例：如 4</param>        /// <returns></returns>        /// </summary>        public void CreateCode_Choose(string strData, string qrEncoding, string level, int version, int scale)        {            var qrCodeEncoder = new QRCodeEncoder();            var encoding = qrEncoding;            switch (encoding)            {                case "Byte":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                    break;                case "AlphaNumeric":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;                    break;                case "Numeric":                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;                    break;                default:                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;                    break;            }            qrCodeEncoder.QRCodeScale = scale;            qrCodeEncoder.QRCodeVersion = version;            switch (level)            {                case "L":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;                    break;                case "M":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;                    break;                case "Q":                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;                    break;                default:                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;                    break;            }            Image image = null;            FileStream fs = null;            try            {                //文字生成图片                image = qrCodeEncoder.Encode(strData);                var filename = DateTime.Now.ToString("yyyymmddhhmmssfff") + ".jpg";                var filepath = HttpContext.Current.Server.MapPath(@"~\Upload") + "\\" + filename;                fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write);                image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);            }            catch (IOException ex)            {                throw new IOException(ex.Message);            }            finally            {                if (fs != null) fs.Close();                if (image != null) image.Dispose();            }        }

本文出自 “彭泽0902” 博客，请务必保留此出处http://pengze0902.blog.51cto.com/7693836/1862735

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