标签:android style blog http io ar color os 使用
很久之前就有写这样的代码了,只是一直没记录下来,偶然想写成博客。
把之前的代码封装成函数,以方便理解以及调用。
基于开源的 ZXing.NET 组件,代码如下:
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;
方法一是生成二维码图片:
/// <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; }
方法二是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); } ////本文地址:http://www.cnblogs.com/Interkey/p/qrcode.html //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; }
效果如下:
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; }
以上是生成和解析二维码的代码,至于生成一维码和对应的解析也很简单。
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。
参考:
标签:android style blog http io ar color os 使用
原文地址:http://www.cnblogs.com/Interkey/p/qrcode.html