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c#裁剪图片后使用zxing生成二维码示例分享

2019年07月18日  | 移动技术网IT编程  | 我要评论

复制代码 代码如下:

/// <summary>
/// 生成二维码
/// </summary>
/// <param name="filename">生成二维码路径</param>
/// <param name="url">生成的内容</param>
/// <param name="width">二维码宽</param>
/// <param name="height">二维码高</param>
/// <param name="userface">需生成的logo图片</param>
/// <returns></returns>
private bitmap getcodeimgurl(string filename, string url, int width, int height, string userface)
{

    barcodewriter writer = new barcodewriter
    {
        format = barcodeformat.qr_code,
        renderer = new bitmaprenderer
        {
            foreground = color.black
        },
        options = new zxing.qrcode.qrcodeencodingoptions
        {
            disableeci = true,
            height = height,
            width = width,
            margin = 0,
            characterset = "utf-8",
            errorcorrection = errorcorrectionlevel.m
        }
    };

    bitmap bitmap = writer.write(url);
    if (!string.isnullorempty(userface))
    {
        bitmap bits = (system.drawing.bitmap)system.drawing.image.fromfile(userface);
        if (bits != null)
        {                   
            //剪裁一个80*80的logo图片
            imagecut img = new imagecut(0, 0, 80, 80);
            system.drawing.bitmap icon = img.kicut(bits);
            //userface_b.jpg是一个边框的图片
            bitmap bits2 = new system.drawing.bitmap((system.drawing.bitmap)system.drawing.image.fromfile(application.startuppath + "/user/userface_b.jpg"), 84, 84);
            if (icon != null)
            {
                try
                { 
                    //画了2个边框，一个是logo,一个在logo周围加了一个边框
                    using (var graphics = system.drawing.graphics.fromimage(bitmap))
                    {
                        graphics.drawimage(bits2, (bitmap.width - bits2.width) / 2, (bitmap.height - bits2.height) / 2);
                        graphics.drawimage(icon, (bitmap.width - icon.width) / 2, (bitmap.height - icon.height) / 2);

                    }

                }
                catch (exception ex)
                {

                }
                finally
                {
                    icon.dispose();
                    gc.collect();

                }
            }
            bitmap.save(filename, imageformat.jpeg);
        }

    }

    return bitmap;
}

复制代码 代码如下:

public class imagecut
  {

      /// <summary>
      /// 剪裁 -- 用gdi+
      /// </summary>
      /// <param name="b">原始bitmap</param>
      /// <param name="startx">开始坐标x</param>
      /// <param name="starty">开始坐标y</param>
      /// <param name="iwidth">宽度</param>
      /// <param name="iheight">高度</param>
      /// <returns>剪裁后的bitmap</returns>
      public bitmap kicut(bitmap b)
      {
          if (b == null)
          {
              return null;
          }
          int w = b.width;
          int h = b.height;
          int intwidth = 0;
          int intheight = 0;
          if (h * width / w > height)
          {
              intwidth = width;
              intheight = h * width / w;

          }
          else if (h * width / w < height)
          {
              intwidth = w * height / h;
              intheight = height;

          }
          else
          {
              intwidth = width;
              intheight = height;
          }

          bitmap bmpout_b = new system.drawing.bitmap(b, intwidth, intheight);
          w = bmpout_b.width;
          h = bmpout_b.height;
        

          if (x >= w || y >= h)
          {
              return null;
          }

          if (x + width > w)
          {
              width = w - x;
          }
          else
          {
              x = (w-width) / 2;
          }

          if (y + height > h)
          {
              height = h - y;
          }
        

 

          try
          {
              bitmap bmpout = new bitmap(width, height, pixelformat.format24bpprgb);            
              graphics g = graphics.fromimage(bmpout);
              g.drawimage(bmpout_b, new rectangle(0, 0, width, height), new rectangle(x, y, width, height), graphicsunit.pixel);
              g.dispose();

              return bmpout;
          }
          catch
          {
              return null;
          }
      }

      public int x = 0;
      public int y = 0;
      public int width = 120;
      public int height = 120;
      public imagecut(int x, int y, int width, int heigth)
      {
          x = x;
          y = y;
          width = width;
          height = heigth;
      }
  }

复制代码 代码如下:

  private void btnsubmit_click(object sender, eventargs e)
        {
            string userid = "1245460396";   

            string curfilepath = "/user/";

            string curfilename_b = "dimensionalpig_" + userid + "_b";
            string path = application.startuppath + curfilepath;
            if (directory.exists(path) == false)//如果不存在就创建file文件夹
            {
                directory.createdirectory(path);
            }
            string filename_b = application.startuppath + curfilepath + "/" + curfilename_b + ".jpg";//获得上传文件名

            string userurl = string.format("//www.jb51.net/u{0}", userid.trim());
            string userface_b = application.startuppath + "/user/" + userid + "_b.jpg";

            bitmap bitmap_b = getcodeimgurl(filename_b.replace("_b.", "_b_ewm."), userurl, 400, 400, userface_b);
            this.p.image =(system.drawing.image)bitmap_b;
this.p.image.save(filename_b.replace("_b.", "_b_ewm."));

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