191 lines
7.6 KiB
C#
191 lines
7.6 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Text;
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using ZXing;
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using ZXing.Common;
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using ZXing.QrCode;
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using ZXing.QrCode.Internal;
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namespace Nirvana.Common
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{
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/// <summary>
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/// 条形码和二维码帮助类
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/// </summary>
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public class BarcodeHelper
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{
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/// <summary>
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/// 生成二维码
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/// </summary>
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/// <param name="text">内容</param>
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/// <param name="width">宽度</param>
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/// <param name="height">高度</param>
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/// <returns></returns>
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public static Bitmap QrCode(string text, int width, int height, int margin = 1)
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{
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var writer = new BarcodeWriterPixelData();
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writer.Format = BarcodeFormat.QR_CODE;
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QrCodeEncodingOptions options = new QrCodeEncodingOptions()
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{
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DisableECI = true,//设置内容编码
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CharacterSet = "UTF-8",
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Width = width,//设置二维码的宽度和高度
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Height = height,
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Margin = margin//设置二维码的边距,单位不是固定像素
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};
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writer.Options = options;
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var pixdata = writer.Write(text);
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Bitmap map = PixToBitmap(pixdata.Pixels, pixdata.Width, pixdata.Height);
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return map;
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}
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/// <summary>
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/// 将一个字节数组转换为位图
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/// </summary>
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/// <param name="pixValue">显示字节数组</param>
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/// <param name="width">图像宽度</param>
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/// <param name="height">图像高度</param>
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/// <returns></returns>
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private static Bitmap PixToBitmap(byte[] pixValue,int width,int height)
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{
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//// 申请目标位图的变量，并将其内存区域锁定
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var m_currBitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
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var m_rect = new Rectangle(0, 0, width, height);
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var m_bitmapData = m_currBitmap.LockBits(m_rect, ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);
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IntPtr iptr = m_bitmapData.Scan0; // 获取bmpData的内存起始位置
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//// 用Marshal的Copy方法，将刚才得到的内存字节数组复制到BitmapData中
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System.Runtime.InteropServices.Marshal.Copy(pixValue, 0, iptr, pixValue.Length);
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m_currBitmap.UnlockBits(m_bitmapData);
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//// 算法到此结束，返回结果
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return m_currBitmap;
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}
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/// <summary>
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/// 生成一维条形码
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/// </summary>
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/// <param name="text">内容</param>
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/// <param name="width">宽度</param>
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/// <param name="height">高度</param>
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/// <returns></returns>
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public static Bitmap BarCode(string text, int width, int height)
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{
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var writer = new BarcodeWriter<Bitmap>();
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//使用ITF 格式，不能被现在常用的支付宝、微信扫出来
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//如果想生成可识别的可以使用 CODE_128 格式
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//writer.Format = BarcodeFormat.ITF;
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writer.Format = BarcodeFormat.CODE_39;
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EncodingOptions options = new EncodingOptions()
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{
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Width = width,
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Height = height,
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Margin = 2
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};
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writer.Options = options;
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Bitmap map = writer.Write(text);
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return map;
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}
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/// <summary>
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/// 生成带Logo的二维码
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/// </summary>
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/// <param name="text">内容</param>
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/// <param name="width">宽度</param>
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/// <param name="height">高度</param>
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/// <param name="db">true表示删除白边</param>
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public static Bitmap QrCodeLogo(string text, int width, int height, bool db = false)
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{
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//Logo 图片
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string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"\img\logo.png";
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Bitmap logo = new Bitmap(logoPath);
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//构造二维码写码器
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MultiFormatWriter writer = new MultiFormatWriter();
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Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>();
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hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
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hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
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//hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边
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width = width + 20;
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height = height + 20;
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//生成二维码
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BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width, height, hint);
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if (db)
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{
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bm = deleteWhite(bm);
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}
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var barcodeWriter = new BarcodeWriter<Bitmap>();
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Bitmap map = barcodeWriter.Write(bm);
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//获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）
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int[] rectangle = bm.getEnclosingRectangle();
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//计算插入图片的大小和位置
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int middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width);
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int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height);
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int middleL = (map.Width - middleW) / 2;
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int middleT = (map.Height - middleH) / 2;
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// 将img转换成bmp格式，否则后面无法创建Graphics对象
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Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);
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using (Graphics g = Graphics.FromImage(bmpimg))
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{
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g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
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g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
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g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
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g.DrawImage(map, 0, 0, width, height);
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//白底将二维码插入图片
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g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);
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g.DrawImage(logo, middleL, middleT, middleW, middleH);
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}
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return bmpimg;
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}
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/// <summary>
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/// 删除默认对应的空白
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/// </summary>
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/// <param name="matrix"></param>
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/// <returns></returns>
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private static BitMatrix deleteWhite(BitMatrix matrix)
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{
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int[] rec = matrix.getEnclosingRectangle();
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int resWidth = rec[2] + 1;
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int resHeight = rec[3] + 1;
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BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
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resMatrix.clear();
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for (int i = 0; i < resWidth; i++)
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{
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for (int j = 0; j < resHeight; j++)
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{
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if (matrix[i + rec[0], j + rec[1]])
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resMatrix[i, j] = true;
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}
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}
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return resMatrix;
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}
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/// <summary>
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/// 读取二维码,读取失败，返回空字符串
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/// </summary>
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/// <param name="filename">指定二维码图片位置</param>
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public static string ReadCodde(string filename)
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{
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BarcodeReader reader = new BarcodeReader();
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reader.Options.CharacterSet = "UTF-8";
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Bitmap map = new Bitmap(filename);
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//MemoryStream ms = new MemoryStream();
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//map.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
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//byte[] bytes = ms.GetBuffer(); //byte[] bytes= ms.ToArray(); 这两句都可以，至于区别么，下面有解释
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//ms.Close();
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Result result = reader.Decode(map);
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return result == null ? "" : result.Text;
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}
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}
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}
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