本文实例总结了ASP.NET生成二维码的方法。分享给大家供大家参考,具体如下:
分享一例c#生成二维码的代码,直接引用ThoughtWorks.QRCode.dll 类生成二维码,有需要的朋友参考下。
方法1.直接引用ThoughtWorks.QRCode.dll 类,生成二维码。
代码示例:
ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方法(注意:BYTE能支持中文,ALPHA_NUMERIC扫描出来的都是数字)encoder.QRCodeScale = 4;//大小encoder.QRCodeVersion = 0;//版本(注意:设置为0主要是防止编码的字符串太长时发生错误)encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;String qrdata = "二维码信息";System.Drawing.Bitmap bp = encoder.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312"));Image image = bp;Object oMissing = System.Reflection.Missing.Value;pictureBox1.Image = bp;
保存二维码图片:
代码示例:
SaveFileDialog sf = new SaveFileDialog();sf.Title = "选择保存文件位置";sf.Filter = "保存图片(*.jpg) |*.jpg|所有文件(*.*) |*.*";//设置默认文件类型显示顺序sf.FilterIndex = 1;//保存对话框是否记忆上次打开的目录sf.RestoreDirectory = true;if (sf.ShowDialog() == DialogResult.OK){ Image im = this.pictureBox1.Image; //获得文件路径 string localFilePath = sf.FileName.ToString(); if (sf.FileName != "") { string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("//") + 1);//获取文件名,不带路径 // newFileName = fileNameExt+DateTime.Now.ToString("yyyyMMdd") ;//给文件名后加上时间 string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf(".")); //获取文件路径,带文件名,不带后缀 string fn = sf.FileName; pictureBox1.Image.Save(FilePath +"-"+ DateTime.Now.ToString("yyyyMMdd") + ".jpg"); }}//解析二维码信息// QRCodeDecoder decoder = new QRCodeDecoder();// String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)));//this.label3.Text = decodedString;
方法2.引用ZXing类库。
ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。于此同时,它同样提供 cpp,ActionScript,android,iPhone,rim,j2me,j2se,jruby,C#等方式的类库。zxing类库的作用主 要是解码,是目前开源类库中解码能力比较强的(商业的另说,不过对于动辄成千上万的类库授权费用,的确很值)。
到谷歌code下载相应的代码
1.下载zxing最新的包
到zxing的主页: http://code.google.com/p/zxing/
找到其中的CSharp文件夹,在vs中打开并编译,将obj下debug中的zxing.dll复制并粘帖到你的项目中的bin文件目录下,
右击添加项目引用。将zxing.dll引用到项目中,就可以在需要的地方使用了。
源代码中有两处UTF-8的问题,会导致中文出现乱码(编译.dll之前修改)
其一:com.google.zxing.qrcode.encoder.encoder类中的
internal const System.String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1";
此处,将ISO-8859-1改为UTF-8
其二:com.google.zxing.qrcode.decoder.DecodedBitStreamParser类的成员
private const System.String UTF8 = "UTF8";
应将UTF8改为UTF-8
代码示例:
using com.google.zxing.qrcode;using com.google.zxing;using com.google.zxing.common;using ByteMatrix = com.google.zxing.common.ByteMatrix;using EAN13Writer = com.google.zxing.oned.EAN13Writer;using EAN8Writer = com.google.zxing.oned.EAN8Writer;using MultiFormatWriter = com.google.zxing.MultiFormatWriter;
方法:
string content = "二维码信息";ByteMatrix byteMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300);Bitmap bitmap = toBitmap(byteMatrix);pictureBox1.Image = bitmap;SaveFileDialog sFD = new SaveFileDialog();sFD.Filter = "保存图片(*.png) |*.png|所有文件(*.*) |*.*";sFD.DefaultExt = "*.png|*.png";sFD.AddExtension = true;if (sFD.ShowDialog() == DialogResult.OK){if (sFD.FileName != ""){ writeToFile(byteMatrix, System.Drawing.Imaging.ImageFormat.Png, sFD.FileName);}}
解析二维码:
代码示例:
if (this.openFileDialog1.ShowDialog() != DialogResult.OK){return;}Image img = Image.FromFile(this.openFileDialog1.FileName);Bitmap bmap;try{bmap = new Bitmap(img);}catch (System.IO.IOException ioe){MessageBox.Show(ioe.ToString());return;}if (bmap == null){MessageBox.Show("Could not decode image");return;}LuminanceSource source = new RGBLuminanceSource(bmap, bmap.Width, bmap.Height);com.google.zxing.BinaryBitmap bitmap1 = new com.google.zxing.BinaryBitmap(new HybridBinarizer(source));Result result;try{result = new MultiFormatReader().decode(bitmap1);}catch (ReaderException re){MessageBox.Show(re.ToString());return;}MessageBox.Show(result.Text);public static void writeToFile(ByteMatrix matrix, System.Drawing.Imaging.ImageFormat format, string file){ Bitmap bmap = toBitmap(matrix); bmap.Save(file, format);}public static Bitmap toBitmap(ByteMatrix matrix){ int width = matrix.Width; int height = matrix.Height; Bitmap bmap = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb); for (int x = 0; x < width; x++){for (int y = 0; y < height; y++){ bmap.SetPixel(x, y, matrix.get_Renamed(x, y) != -1 ? ColorTranslator.FromHtml("0xFF000000") : ColorTranslator.FromHtml("0xFFFFFFFF"));}}return bmap;}