发布时间:2018-11-06编辑:佚名阅读(3100)
ZXing是一个开放源码的,用Java实现的多种格式的1D/2D条码图像处理库,它包含了联系到其他语言的端口。而ZXing.Net是ZXing的端口之一。
涉及知识点:
BarcodeWriter 用于生成图片格式的条码类,通过Write函数进行输出。
BarcodeFormat 枚举类型,条码格式
QrCodeEncodingOptions 二维码设置选项,继承于EncodingOptions,主要设置宽,高,编码方式等信息。
MultiFormatWriter 复合格式条码写码器,通过encode方法得到BitMatrix。
BitMatrix 表示按位表示的二维矩阵数组,元素的值用true和false表示二进制中的1和0。
示例效果图
关键代码
如下所示,包含一维条码,二维条码,和带logo的条码
using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Imaging; using ZXing; using ZXing.Common; using ZXing.QrCode; using ZXing.QrCode.Internal; namespace 条形码和二维码 { /// <summary> /// 描述:条形码和二维码帮助类 /// </summary> public class BarcodeHelper { /// <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 Generate1(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 Generate2(string text, int width, int height) { BarcodeWriter writer = new BarcodeWriter(); //使用ITF 格式,不能被现在常用的支付宝、微信扫出来 //如果想生成可识别的可以使用 CODE_128 格式 //writer.Format = BarcodeFormat.ITF; writer.Format = BarcodeFormat.CODE_39; EncodingOptions options = new EncodingOptions() { Width = width, Height = height, Margin = 2 }; 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 Generate3(string text, int width, int height) { //Logo 图片 string logoPath = AppDomain.CurrentDomain.BaseDirectory + @"\logo.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); System.Windows.Forms.Clipboard.SetImage(map); //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 = (width - middleW) / 2; int middleT = (height - middleH) / 2; Bitmap bmpimg = new Bitmap(width, 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); } System.Windows.Forms.Clipboard.SetImage(bmpimg); 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; } } }
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