.net\C#基于zxing的彩色、Logo二维码生成---随笔

1、点击项目名称右键-->管理NuGet程序包，打开NuGet包管理器窗口，进行搜索下载即可。

2、生成二维码：

 public Bitmap CreateQRCode(string str, int width, int height){EncodingOptions options = new QrCodeEncodingOptions{DisableECI = true,CharacterSet = "UTF-8", //编码Width = width,             //宽度Height = height             //高度};BarcodeWriter writer = new BarcodeWriter();writer.Format = BarcodeFormat.QR_CODE;writer.Options = options;Bitmap map = writer.Write(str);return map;}

普通二维码效果图

3、生成带Logo二维码

        static Bitmap GenerateLogo(string text){//Logo 图片Bitmap logo = new Bitmap(@"D:\pic\34.jpg");//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);//生成二维码 BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, 300, 300, hint);BarcodeWriter barcodeWriter = new BarcodeWriter();Bitmap map = 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 middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width);int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height);int middleL = (map.Width - middleW) / 2;int middleT = (map.Height - middleH) / 2;//将img转换成bmp格式，否则后面无法创建Graphics对象Bitmap bmpimg = new Bitmap(map.Width, map.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);}//将二维码插入图片Graphics myGraphic = Graphics.FromImage(bmpimg);//白底myGraphic.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH);//保存成图片return bmpimg;}

带Logo二维码效果

4、生成彩色带Logo的二维码

     public Bitmap GenerateColorLogo(string text){//Logo 图片Bitmap logo = new Bitmap(@"D:\pic\34.jpg");//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);//生成二维码 BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, 300, 300, hint);BarcodeWriter barcodeWriter = new BarcodeWriter();Bitmap map = 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 middleW = Math.Min((int)(rectangle[2] / 3.5), logo.Width);int middleH = Math.Min((int)(rectangle[3] / 3.5), logo.Height);int middleL = (map.Width - middleW) / 2;int middleT = (map.Height - middleH) / 2;Bitmap bmpimg = new Bitmap(map.Width, map.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);}//将二维码插入图片Graphics myGraphic = Graphics.FromImage(bmpimg);//白底myGraphic.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);myGraphic.DrawImage(logo, middleL, middleT, middleW, middleH);Bitmap map2 = new Bitmap(bmpimg.Width, bmpimg.Height, PixelFormat.Format32bppArgb);Graphics graphics = Graphics.FromImage(map2);graphics.SmoothingMode = SmoothingMode.AntiAlias;graphics.DrawImage(bmpimg, 0, 0);map.Dispose();Bitmap map3 = QrCodeVertical(map2.Width, map2.Height);Color color = Color.FromArgb(200, 233, 0, 1);int num = 92;try{num -= (Encoding.UTF8.GetBytes(text).Length - 20) / 2;}catch (Exception e){Console.WriteLine(e);}int num2 = num;int num3 = num2;for (int i = 0; i < map2.Width; i++){for (int j = 0; j < map2.Height; j++){Color color3;Color pixel = map2.GetPixel(i, j);if ((i < num2) && (j < num3)){color3 = ((pixel.A == 0xff) && (pixel.B == 0)) ? color : pixel;}else{color3 = ((pixel.A == 0xff) && (pixel.B == 0)) ? map3.GetPixel(i, j) : pixel;}map2.SetPixel(i, j, color3);}}map3.Dispose();           return map2;}///渐变颜色private Bitmap QrCodeVertical(int width, int heigth){var image = new Bitmap(width, heigth, PixelFormat.Format32bppArgb);var rect = new Rectangle(0, 0, width, heigth);var brush = new LinearGradientBrush(rect, Color.FromArgb(230, 0x01, 0xa9, 160), Color.FromArgb(0xff, 150, 90, 0x0), LinearGradientMode.Vertical);Graphics graphics = Graphics.FromImage(image);graphics.FillRectangle(brush, rect);graphics.Dispose();return image;}

带Logo的彩色二维码

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