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C#生成带二维码的专属微信公众号推广海报实例代码

︶ㄣ米米素材网 メ
米米素材网V管理员 / 阅读
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这篇文章主要给大家介绍了关于利用C#如何生成带二维码的专属微信公众号推广海报的相关资料，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们一起来看看吧

前言

很多微信公众号中需要生成推广海报的功能，粉丝获得专属海报后可以分享到朋友圈或发给朋友，为公众号代言邀请好友即可获取奖励的。海报自带渠道二维码，粉丝长按二维码即可关注微信公众号，从而达到吸粉的目的。

效果如下：

C#生成带二维码的专属微信公众号推广海报实例代码

代码实现：

1.获取临时二维码ticket

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/// <summary>
/// 获取临时二维码ticket
/// </summary>
/// <param name="scene_str">场景值id openid做场景值id</param>
/// <returns></returns>
public static string createtempqrcode(string scene_str,string access_token)
{
 var result = httputility.sendposthttprequest($"https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token={access_token}", "application/json", "{\"expire_seconds\": 2592000, \"action_name\": \"qr_str_scene\", \"action_info\": {\"scene\": {\"scene_str\": \"" + scene_str + "\"}}}");
 
 jobject jobect = (jobject)jsonconvert.deserializeobject(result);
 
 string ticket = (string)jobect["ticket"];
 
 if (string.isnullorempty(ticket))
 {
  loghelper.writelog(typeof(weixinhelper), "获取临时二维码ticket失败" + result);
  return null;
 }
 return ticket;
}

使用openid作为场景值的好处是通过扫a推广的二维码关注用户的场景值便是a的openid。

2. 生成带二维码的专属推广图片

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/// <summary>
/// 生成带二维码的专属推广图片
/// </summary>
/// <param name="user"></param>
/// <returns></returns>
public string draw(wxuser user)
{
 //背景图片
 string path = server.mappath("/content/images/tg.jpg");
 
 system.drawing.image imgsrc = system.drawing.image.fromfile(path);
 
 //处理二维码图片大小 240*240px
 system.drawing.image qrcodeimage = reduceimage("https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket="+user.ticket, 240, 240);
 
 //处理头像图片大小 100*100px
 image titleimage = reduceimage(user.headimgurl, 100, 100);
 
 using (graphics g = graphics.fromimage(imgsrc))
 {
  //画专属推广二维码
  g.drawimage(qrcodeimage, new rectangle(imgsrc.width - qrcodeimage.width - 200,
  imgsrc.height - qrcodeimage.height - 200,
  qrcodeimage.width,
  qrcodeimage.height),
  0, 0, qrcodeimage.width, qrcodeimage.height, graphicsunit.pixel);
 
  //画头像
  g.drawimage(titleimage, 8, 8, titleimage.width, titleimage.height);
 
  font font = new font("宋体", 30, fontstyle.bold);
 
  g.drawstring(user.nickname, font, new solidbrush(color.red), 110, 10);
 }
 string newpath = server.mappath(@"/content/images/newtg_" + guid.newguid().tostring() + ".jpg");
 imgsrc.save(newpath, system.drawing.imaging.imageformat.jpeg);
 return newpath;
}
 
 
/// <summary>
/// 缩小/放大图片
/// </summary>
/// <param name="url">图片网络地址</param>
/// <param name="towidth">缩小/放大宽度</param>
/// <param name="toheight">缩小/放大高度</param>
/// <returns></returns>
public image reduceimage(string url, int towidth, int toheight)
{
 webrequest request = webrequest.create(url);
 webresponse response = request.getresponse();
 stream responsestream = response.getresponsestream();
 
 image originalimage = image.fromstream(responsestream);
 if (towidth <= 0 && toheight <= 0)
 {
  return originalimage;
 }
 else if (towidth > 0 && toheight > 0)
 {
  if (originalimage.width < towidth && originalimage.height < toheight)
   return originalimage;
 }
 else if (towidth <= 0 && toheight > 0)
 {
  if (originalimage.height < toheight)
   return originalimage;
  towidth = originalimage.width * toheight / originalimage.height;
 }
 else if (toheight <= 0 && towidth > 0)
 {
  if (originalimage.width < towidth)
   return originalimage;
  toheight = originalimage.height * towidth / originalimage.width;
 }
 image tobitmap = new bitmap(towidth, toheight);
 using (graphics g = graphics.fromimage(tobitmap))
 {
  g.interpolationmode = system.drawing.drawing2d.interpolationmode.high;
  g.smoothingmode = system.drawing.drawing2d.smoothingmode.highquality;
  g.clear(color.transparent);
  g.drawimage(originalimage,
     new rectangle(0, 0, towidth, toheight),
     new rectangle(0, 0, originalimage.width, originalimage.height),
     graphicsunit.pixel);
  originalimage.dispose();
  return tobitmap;
 }
}

3.将图片上传微信服务器，并发送给用户

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string imagepath = draw(user);
         
string result = httputility.uploadfile($"https://api.weixin.qq.com/cgi-bin/material/add_material?access_token={access_token}&type=image", imagepath);
 
jobject jobject = (jobject)jsonconvert.deserializeobject(result);
         
string media_id = (string)jobject["media_id"];
if (!string.isnullorempty(media_id))
{
          
  string resxml = "<xml><tousername><![cdata[" + xmlmsg.fromusername + "]]></tousername><fromusername><![cdata[" + xmlmsg.tousername + "]]></fromusername><createtime>" + nowtime + "</createtime><msgtype><![cdata[image]]></msgtype><image><mediaid><![cdata[" + media_id + "]]></mediaid></image></xml>";
  return resxml;
}
loghelper.writelog(typeof(wechatcontroller), "上传专属推广图片素材失败" + result);

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对米米素材网的支持。

原文链接：https://www.cnblogs.com/gracexu/p/10081111.html