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// 在aspx页面调用和输出为图片流 string content = string.IsNullOrEmpty(Request.QueryString["txt"]) ? "http://www.lenashane.com/" : Request.QueryString["txt"]; int size = Convert.ToInt32(string.IsNullOrEmpty(Request.QueryString["size"]) ? "200" : Request.QueryString["size"]); int border = Convert.ToInt32(string.IsNullOrEmpty(Request.QueryString["border"]) ? "10" : Request.QueryString["border"]); System.Drawing.Image image = CreateQRCode(content, QRCodeEncoder.ENCODE_MODE.BYTE, QRCodeEncoder.ERROR_CORRECTION.M, 0, 5, size, border); //将图片输出到页面 System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ContentType = "image/Png"; HttpContext.Current.Response.OutputStream.Write(ms.ToArray(), 0, ms.ToArray().Length); HttpContext.Current.Response.End(); ms.Close(); ms = null; image.Dispose(); image = null; 生成二维码方法,增加定位点着色参数(System.Drawing.Color),效果如下: /// <summary> /// 生成二维码 /// </summary> /// <param name="Content">内容文本</param> /// <param name="QRCodeEncodeMode">二维码编码方式</param> /// <param name="QRCodeErrorCorrect">纠错码等级</param> /// <param name="QRCodeVersion">二维码版本号 0-40</param> /// <param name="QRCodeScale">每个小方格的预设宽度(像素),正整数</param> /// <param name="size">图片尺寸(像素),0表示不设置</param> /// <param name="border">图片白边(像素),当size大于0时有效</param> /// <returns></returns> public System.Drawing.Image CreateQRCode(string Content, QRCodeEncoder.ENCODE_MODE QRCodeEncodeMode, QRCodeEncoder.ERROR_CORRECTION QRCodeErrorCorrect, int QRCodeVersion, int QRCodeScale, int size, int border, Color codeEyeColor) { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncodeMode; qrCodeEncoder.QRCodeErrorCorrect = QRCodeErrorCorrect; qrCodeEncoder.QRCodeScale = QRCodeScale; qrCodeEncoder.QRCodeVersion = QRCodeVersion; System.Drawing.Image image = qrCodeEncoder.Encode(Content); #region 根据设定的目标图片尺寸调整二维码QRCodeScale设置,并添加边框 if (size > 0) { //当设定目标图片尺寸大于生成的尺寸时,逐步增大方格尺寸 #region 当设定目标图片尺寸大于生成的尺寸时,逐步增大方格尺寸 while (image.Width < size) { qrCodeEncoder.QRCodeScale++; System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); if (imageNew.Width < size) { image = new System.Drawing.Bitmap(imageNew); imageNew.Dispose(); imageNew = null; } else { qrCodeEncoder.QRCodeScale--; //新尺寸未采用,恢复最终使用的尺寸 imageNew.Dispose(); imageNew = null; break; } } #endregion //当设定目标图片尺寸小于生成的尺寸时,逐步减小方格尺寸 #region 当设定目标图片尺寸小于生成的尺寸时,逐步减小方格尺寸 while (image.Width > size && qrCodeEncoder.QRCodeScale > 1) { qrCodeEncoder.QRCodeScale--; System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); image = new System.Drawing.Bitmap(imageNew); imageNew.Dispose(); imageNew = null; if (image.Width < size) { break; } } #endregion //根据参数设置二维码图片白边的最小宽度(按需缩小) #region 根据参数设置二维码图片白边的最小宽度 if (image.Width <= size && border > 0) { while (image.Width <= size && size - image.Width < border * 2 && qrCodeEncoder.QRCodeScale > 1) { qrCodeEncoder.QRCodeScale--; System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); image = new System.Drawing.Bitmap(imageNew); imageNew.Dispose(); imageNew = null; } } #endregion //已经确认二维码图像,为图像染色修饰 if (true) { //定位点方块边长 int beSize = qrCodeEncoder.QRCodeScale * 3; int bep1_l = qrCodeEncoder.QRCodeScale * 2; int bep1_t = qrCodeEncoder.QRCodeScale * 2; int bep2_l = image.Width - qrCodeEncoder.QRCodeScale * 5 - 1; int bep2_t = qrCodeEncoder.QRCodeScale * 2; int bep3_l = qrCodeEncoder.QRCodeScale * 2; int bep3_t = image.Height - qrCodeEncoder.QRCodeScale * 5 - 1; int bep4_l = image.Width - qrCodeEncoder.QRCodeScale * 7 - 1; int bep4_t = image.Height - qrCodeEncoder.QRCodeScale * 7 - 1; System.Drawing.Graphics graphic0 = System.Drawing.Graphics.FromImage(image); // Create solid brush. SolidBrush blueBrush = new SolidBrush(codeEyeColor); // Fill rectangle to screen. graphic0.FillRectangle(blueBrush, bep1_l, bep1_t, beSize, beSize); graphic0.FillRectangle(blueBrush, bep2_l, bep2_t, beSize, beSize); graphic0.FillRectangle(blueBrush, bep3_l, bep3_t, beSize, beSize); graphic0.FillRectangle(blueBrush, bep4_l, bep4_t, qrCodeEncoder.QRCodeScale, qrCodeEncoder.QRCodeScale); } //当目标图片尺寸大于二维码尺寸时,将二维码绘制在目标尺寸白色画布的中心位置 #region 如果目标尺寸大于生成的图片尺寸,将二维码绘制在目标尺寸白色画布的中心位置 if (image.Width < size) { //新建空白绘图 System.Drawing.Bitmap panel = new System.Drawing.Bitmap(size, size); System.Drawing.Graphics graphic0 = System.Drawing.Graphics.FromImage(panel); int p_left = 0; int p_top = 0; if (image.Width <= size) //如果原图比目标形状宽 { p_left = (size - image.Width) / 2; } if (image.Height <= size) { p_top = (size - image.Height) / 2; } //将生成的二维码图像粘贴至绘图的中心位置 graphic0.DrawImage(image, p_left, p_top, image.Width, image.Height); image = new System.Drawing.Bitmap(panel); panel.Dispose(); panel = null; graphic0.Dispose(); graphic0 = null; } #endregion } #endregion return image; }
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