本文介紹在 C# 中使用 ThoughtWorks.QRCode.dll 生成指定尺寸和邊框寬度的二維碼。網上文章大多只是簡單介紹內置參數的設置，根據我的使用目的，增加了自定義目標二維碼圖片尺寸和白邊邊框。有需要的朋友們可以試一下，如有bug歡迎指正。
?首先，將 ThoughtWorks.QRCode.dll 放在 bin 目錄后，在頁面中引用：
using?ThoughtWorks.QRCode.Codec; 生成二維碼圖片：
| 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>/// 生成二維碼/// </summary>/// <param name="Content">內容文本</param>/// <param name="QRCodeEncodeMode">二維碼編碼方式</param>/// <param name="QRCodeErrorCorrect">糾錯碼等級</param>/// <param name="QRCodeVersion">二維碼版本號 0-40</param>/// <param name="QRCodeScale">每個小方格的預設寬度（像素），正整數</param>/// <param name="size">圖片尺寸（像素），0表示不設置</param>/// <param name="border">圖片白邊（像素），當size大于0時有效</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 根據設定的目標圖片尺寸調整二維碼QRCodeScale設置，并添加邊框 ????if?(size > 0) ????{ ????????//當設定目標圖片尺寸大于生成的尺寸時，逐步增大方格尺寸 ????????#region 當設定目標圖片尺寸大于生成的尺寸時，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，恢復最終使用的尺寸 ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????????break; ????????????} ????????} ????????#endregion ??????????????????//當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????#region 當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????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 ??????????????????//如果目標尺寸大于生成的圖片尺寸，則為圖片增加白邊 ????????#region 如果目標尺寸大于生成的圖片尺寸，則為圖片增加白邊 ????????if?(image.Width <= size) ????????{ ????????????//根據參數設置二維碼圖片白邊的最小寬度 ????????????#region 根據參數設置二維碼圖片白邊的最小寬度 ????????????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 ??????????????//當目標圖片尺寸大于二維碼尺寸時，將二維碼繪制在目標尺寸白色畫布的中心位置 ????????????if?(image.Width < size) ????????????{ ????????????????//新建空白繪圖 ????????????????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)?//如果原圖比目標形狀寬 ????????????????{ ????????????????????p_left = (size - image.Width) / 2; ????????????????} ????????????????if?(image.Height <= size) ????????????????{ ????????????????????p_top = (size - image.Height) / 2; ????????????????} ??????????????????????????????????//將生成的二維碼圖像粘貼至繪圖的中心位置 ????????????????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類別對圖片進行縮放的時候,需要一個返回bool類別的委托 {????return?true; } |
?在aspx頁面調用和輸出為圖片流：
| 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); ??//將圖片輸出到頁面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; |
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生成二維碼方法，增加定位點著色參數（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>/// 生成二維碼/// </summary>/// <param name="Content">內容文本</param>/// <param name="QRCodeEncodeMode">二維碼編碼方式</param>/// <param name="QRCodeErrorCorrect">糾錯碼等級</param>/// <param name="QRCodeVersion">二維碼版本號 0-40</param>/// <param name="QRCodeScale">每個小方格的預設寬度（像素），正整數</param>/// <param name="size">圖片尺寸（像素），0表示不設置</param>/// <param name="border">圖片白邊（像素），當size大于0時有效</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 根據設定的目標圖片尺寸調整二維碼QRCodeScale設置，并添加邊框 ????if?(size > 0) ????{ ????????//當設定目標圖片尺寸大于生成的尺寸時，逐步增大方格尺寸 ????????#region 當設定目標圖片尺寸大于生成的尺寸時，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，恢復最終使用的尺寸 ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????????break; ????????????} ????????} ????????#endregion ??????????????????//當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????#region 當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????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 ??????????//根據參數設置二維碼圖片白邊的最小寬度（按需縮小） ????????#region 根據參數設置二維碼圖片白邊的最小寬度 ????????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 ??????????????????//已經確認二維碼圖像，為圖像染色修飾 ????????if?(true) ????????{ ????????????//定位點方塊邊長 ????????????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); ????????} ??????????????????//當目標圖片尺寸大于二維碼尺寸時，將二維碼繪制在目標尺寸白色畫布的中心位置 ????????#region 如果目標尺寸大于生成的圖片尺寸，將二維碼繪制在目標尺寸白色畫布的中心位置 ????????if?(image.Width < size) ????????{ ????????????//新建空白繪圖 ????????????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)?//如果原圖比目標形狀寬 ????????????{ ????????????????p_left = (size - image.Width) / 2; ????????????} ????????????if?(image.Height <= size) ????????????{ ????????????????p_top = (size - image.Height) / 2; ????????????} ??????????????????????????//將生成的二維碼圖像粘貼至繪圖的中心位置 ????????????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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