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生成二维码
二维码公共类
/// <summary> /// QrCode /// </summary> public class QrCode { /// <summary> /// 构造函数 /// </summary> /// <param name="data">生成二维码的文本</param> public QrCode(string data) { this.Data =http://www.mamicode.com/ data; } /// <summary> /// 生成二维码数据 /// </summary> public string Data { get; set; } /// <summary> /// 生成二维码尺寸 /// </summary> public QRCodeEncoder.ENCODE_MODE CodeEncoder { get; set; } = QRCodeEncoder.ENCODE_MODE.BYTE; /// <summary> /// 错误相识度 /// </summary> public QRCodeEncoder.ERROR_CORRECTION CodeErrorCorrect { get; set; } = QRCodeEncoder.ERROR_CORRECTION.M; /// <summary> /// 版本 /// </summary> public int CodeVersion { get; set; } = 8; /// <summary> /// 尺寸大小 /// </summary> public int Scale { get; set; } = 4; /// <summary> /// 背景图片地址 /// </summary> public string ImgBackPath { get; set; } /// <summary> /// 背景图片大小 /// </summary> public int ImgBackSize { get; set; } /// <summary> /// 生成二维码图片 /// </summary> /// <returns>Image</returns> public Image CreateCodeImage() { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder { QRCodeEncodeMode = this.CodeEncoder, QRCodeScale = this.Scale, QRCodeVersion = this.CodeVersion, QRCodeErrorCorrect = this.CodeErrorCorrect }; Image image = qrCodeEncoder.Encode(this.Data); if (!string.IsNullOrEmpty(this.ImgBackPath) && this.ImgBackSize > 0) { Image imgBack = CombinImage(image, this.ImgBackPath); return imgBack; } return image; } /// <summary> /// 生成二维码 /// </summary> /// <returns>byte[]</returns> public byte[] CreateCodeByte() { var image = CreateCodeImage(); MemoryStream ms = new MemoryStream(); image.Save(ms, ImageFormat.Jpeg); return ms.ToArray(); } /// <summary> /// 生成二维码 /// </summary> /// <returns>string</returns> public string CreateCodeString() { var bytes = CreateCodeByte(); var result = Convert.ToBase64String(bytes); return result; } /// <summary> /// Convert String to Image /// </summary> /// <param name="str">string</param> /// <returns>Image</returns> public Image StringToImage(string str) { byte[] array = Convert.FromBase64String(str); MemoryStream ms = new MemoryStream(array); Image image = Image.FromStream(ms); return image; } /// <summary> /// 调用此函数后使此两种图片合并,类似相册,有个 /// 背景图,中间贴自己的目标图片 /// </summary> /// <param name="imgBack">粘贴的源图片</param> /// <param name="destImg">粘贴的目标图片</param> private Image CombinImage(Image imgBack, string destImg) { Image img = Image.FromFile(destImg); if (img.Height != this.ImgBackSize || img.Width != this.ImgBackSize) { img = KiResizeImage(img, this.ImgBackSize, this.ImgBackSize); } Graphics g = Graphics.FromImage(imgBack); g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height); //g.DrawImage(imgBack, 0, 0, 相框宽, 相框高); g.FillRectangle(Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1, 1, 1);//相片四周刷一层黑色边框 g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height); GC.Collect(); return imgBack; } /// <summary> /// Resize图片 /// </summary> /// <param name="bmp">原始Bitmap</param> /// <param name="newW">新的宽度</param> /// <param name="newH">新的高度</param> /// <returns>处理以后的图片</returns> private static Image KiResizeImage(Image bmp, int newW, int newH) { try { Image b = new Bitmap(newW, newH); Graphics g = Graphics.FromImage(b); g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel); g.Dispose(); return b; } catch { return null; } } /// <summary> /// 二维码解码 /// </summary> /// <param name="filePath">图片路径</param> /// <returns>二维码文本</returns> public string CodeDecoder(string filePath) { if (!System.IO.File.Exists(filePath)) { return null; } Bitmap myBitmap = new Bitmap(Image.FromFile(filePath)); QRCodeDecoder decoder = new QRCodeDecoder(); string decodedString = decoder.decode(new QRCodeBitmapImage(myBitmap)); return decodedString; } }
调用方法
QrCode.QrCode qrCode = new QrCode.QrCode("http://www.baidu.com"); var str = qrCode.CreateCodeString(); var imge = qrCode.StringToImage(str); var filePath = @"E:" + DateTime.Now.ToString("yyyymmddhhmmssfff") + ".jpg"; FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write); imge.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg); fs.Close(); imge.Dispose();
ThoughtWorks.QRCode.dll
生成二维码
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