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  • C# 中使用 ThoughtWorks.QRCode.dll 生成指定尺寸和边框宽度的二维码

    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：
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    /// <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：

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    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：

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    /// <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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  • 原文地址：https://www.cnblogs.com/soundcode/p/7458375.html
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