本文介绍在 C# 中使用 ThoughtWorks.QRCode.dll 生成指定尺寸和边框宽度的二维码。网上文章大多只是简单介绍内置参数的设置,根据我的使用目的,增加了自定义目标二维码图片尺寸和白边边框。有需要的朋友们可以试一下,如有bug欢迎指正。
首先,将 ThoughtWorks.QRCode.dll 放在 bin 目录后,在页面中引用:
using
ThoughtWorks.QRCode.Codec;
生成二维码图片:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | /// <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) { 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 //如果目标尺寸大于生成的图片尺寸,则为图片增加白边 #region 如果目标尺寸大于生成的图片尺寸,则为图片增加白边 if (image.Width <= size) { //根据参数设置二维码图片白边的最小宽度 #region 根据参数设置二维码图片白边的最小宽度 if (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 //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 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; } private static bool IsTrue() // 在Image类别对图片进行缩放的时候,需要一个返回bool类别的委托 { return true ; } |
在aspx页面调用和输出为图片流:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | 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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | /// <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; } |