.NET使用ZXing.NET生成中间带图片和不带图片的二维码

た入场券 2022-04-24 05:14 89阅读 0赞

# [.NET使用ZXing.NET生成中间带图片和不带图片的二维码][.NET_ZXing.NET] #

基于开源的 [ZXing.NET ][ZXing.NET]组件，代码如下：

1、先添加对ZXing.NET的引用，然后添加相应的命名空间：

using System;
    using System.Collections.Generic;
    using System.Drawing;
    using ZXing;
    using ZXing.Common;
    using ZXing.QrCode;
    using ZXing.QrCode.Internal;

2、生成二维码方法类：

public class QrCodeHelper
 {
 
 
 
 
 #region 方法一是生成中间不带图片的二维码图片
 
 /// <summary>
 /// 生成二维码图片
 /// </summary>
 /// <param name="contents">要生成二维码包含的信息</param>
 /// <param name="width">生成的二维码宽度（默认300像素）</param>
 /// <param name="height">生成的二维码高度（默认300像素）</param>
 /// <returns>二维码图片</returns>
 public static Bitmap GeneratorQrImage(string contents, int width = 300, int height = 300)
 {
 if (string.IsNullOrEmpty(contents))
 {
 return null;
 }
 
 //本文地址：http://www.cnblogs.com/Interkey/p/qrcode.html
 EncodingOptions options = null;
 BarcodeWriter writer = null;
 options = new QrCodeEncodingOptions
 {
 DisableECI = true,
 CharacterSet = "UTF-8",
 Width = width,
 Height = height,
 ErrorCorrection = ErrorCorrectionLevel.H,
 };
 writer = new BarcodeWriter();
 writer.Format = BarcodeFormat.QR_CODE;
 writer.Options = options;
 
 Bitmap bitmap = writer.Write(contents);
 return bitmap;
 }
 
 #endregion
 
 
 
 #region 方法二生成中间带图片的二维码图片
 
 /// <summary>
 /// 生成中间带有图片的二维码图片
 /// </summary>
 /// <param name="contents">要生成二维码包含的信息</param>
 /// <param name="middleImg">要生成到二维码中间的图片</param>
 /// <param name="width">生成的二维码宽度（默认300像素）</param>
 /// <param name="height">生成的二维码高度（默认300像素）</param>
 /// <returns>中间带有图片的二维码</returns>
 public static Bitmap GeneratorQrImage(string contents, Image middleImg, int width = 300, int height = 300)
 {
 if (string.IsNullOrEmpty(contents))
 {
 return null;
 }
 if (middleImg == null)
 {
 //return null;
 return GeneratorQrImage(contents);
 }
 
 
 
 //构造二维码写码器
 MultiFormatWriter mutiWriter = new MultiFormatWriter();
 Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
 hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
 hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
 
 //生成二维码
 BitMatrix bm = mutiWriter.encode(contents, BarcodeFormat.QR_CODE, width, height, hint);
 BarcodeWriter barcodeWriter = new BarcodeWriter();
 Bitmap bitmap = 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 middleImgW = Math.Min((int)(rectangle[2] / 3.5), middleImg.Width);
 int middleImgH = Math.Min((int)(rectangle[3] / 3.5), middleImg.Height);
 int middleImgL = (bitmap.Width - middleImgW) / 2;
 int middleImgT = (bitmap.Height - middleImgH) / 2;
 
 //将img转换成bmp格式，否则后面无法创建 Graphics对象
 Bitmap bmpimg = new Bitmap(bitmap.Width, bitmap.Height, System.Drawing.Imaging.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(bitmap, 0, 0);
 }
 
 //在二维码中插入图片
 Graphics myGraphic = Graphics.FromImage(bmpimg);
 //白底
 myGraphic.FillRectangle(Brushes.White, middleImgL, middleImgT, middleImgW, middleImgH);
 myGraphic.DrawImage(middleImg, middleImgL, middleImgT, middleImgW, middleImgH);
 return bmpimg;
 }
 
 #endregion
 
 
 
 
 
 
 
 
 }

3、简单方法调用实例：

#region 生成二维码
 
 
 
 public ActionResult QrCode()
 {
 String url = "https://www.cnblogs.com/sharing1986687846";
 
 Bitmap barcodeBitmap = (Bitmap)Image.FromFile(@"G:\MyWeb\Web学习\Windows\LiveProject\LiveProject\Images\panda.png");
 
 Bitmap noImgCrCodeBmp= QrCodeHelper.GeneratorQrImage(url); //生成中间不带图的二维码
 
 
 Bitmap imgCrCodeBmp= QrCodeHelper.GeneratorQrImage(url, barcodeBitmap); //生成中间带图的二维码
 
 MemoryStream ms=new MemoryStream();
 
 String imgStr = String.Empty;
 
 imgStr += String.Format(" 二维码对应内容:{0}\" />", url);
 
 
 noImgCrCodeBmp.Save(ms, ImageFormat.Png);
 string base64 = Convert.ToBase64String(ms.ToArray());
 
 imgStr += String.Format(" 中间不带图: <img src=\"data:image/png;base64,{0}\" />", base64);
 
 MemoryStream ms1 = new MemoryStream();
 imgCrCodeBmp.Save(ms1, ImageFormat.Png);
 
 base64 = Convert.ToBase64String(ms1.ToArray());
 
 imgStr += String.Format(" 中间带图: <img src=\"data:image/png;base64,{0}\" />", base64);
 
 
 
 
 return Content(imgStr);
 
 }
 
 #endregion

效果图如下：

![650351-20190118104044690-382958306.png][]

4、中间有图片与没有图片的生成的不一样，原因不清楚，初步以为中间有图片的是因为容错率的原故。

对应的解析代码也很简单：

// create a barcode reader instance
    IBarcodeReader reader = new BarcodeReader();
    // load a bitmap
    Bitmap barcodeBitmap = (Bitmap)Image.FromFile("C:\\sample-barcode-image.png");
    // detect and decode the barcode inside the bitmap
    Result result = reader.Decode(barcodeBitmap);
    // do something with the result
    if (result != null)
    {
        this.txtDecoderType.Text = result.BarcodeFormat.ToString();
        this.txtDecoderContent.Text = result.Text;
    }

结语：

其他常用可生成二维码的组件有：[QrCode.Net][]（开源）、[ZXing][]（开源）、ThoughtWorks.QRCode等。

了解了二维码的数据存储后，可以基于这些技术生成富有创意的二维码。

posted @ 2019-01-18 10:41 [波霸38][38] 阅读( ...) 评论( ...) [编辑][Link 1] 收藏

[.NET_ZXing.NET]: https://www.cnblogs.com/sharing1986687846/p/10286417.html
[ZXing.NET]: https://archive.codeplex.com/?p=zxingnet
[650351-20190118104044690-382958306.png]: /images/20220219/8ddd5c9260fe474b8f373d91e23372f3.png
[QrCode.Net]: http://qrcodenet.codeplex.com/
[ZXing]: https://github.com/zxing/zxing/
[38]: https://www.cnblogs.com/sharing1986687846/
[Link 1]: https://i.cnblogs.com/EditPosts.aspx?postid=10286417