C#运用QRCode生成二维码
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。
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生成二维码:
////// 生成二维码 /// /// 带生成二维码的字符串 /// 路径 ///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 p_w_picpath = 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); p_w_picpath.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (IOException ex) { throw new IOException(ex.Message); } finally { if (fs != null) fs.Close(); p_w_picpath.Dispose(); } return CodeDecoder(filepath); }
2.解析二维码:
////// 二维码解码 /// /// 图片路径 ///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:
////// 选择生成二维码的相关类型 /// 要生成的文字或者数字,支持中文。如: "4408810820 深圳-广州" 或者:4444444444 /// 三种尺寸:BYTE ,ALPHA_NUMERIC,NUMERIC /// 大小:L M Q H /// 版本:如 8 /// 比例:如 4 /// 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 p_w_picpath = null; FileStream fs = null; try { //文字生成图片 p_w_picpath = 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); p_w_picpath.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg); } catch (IOException ex) { throw new IOException(ex.Message); } finally { if (fs != null) fs.Close(); if (p_w_picpath != null) p_w_picpath.Dispose(); } }///
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