C#生成带二维码的专属微信公众号推广海报实例代码

第C#生成带二维码的专属微信公众号推广海报实例代码前言

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：

代码实现：

1.获取临时二维码ticket

///summary

///获取临时二维码ticket

////summary

///paramname="scene_str"场景值IDopenid做场景值ID/param

///returns/returns

publicstaticstringCreateTempQRCode(stringscene_str,stringaccess_token)

varresult=HttpUtility.SendPostHttpRequest($"/cgi-bin/qrcode/createaccess_token={access_token}","application/json","{\"expire_seconds\":2592000,\"action_name\":\"QR_STR_SCENE\",\"action_info\":{\"scene\":{\"scene_str\":\""+scene_str+"\"}}}");

JObjectjobect=(JObject)JsonConvert.DeserializeObject(result);

stringticket=(string)jobect["ticket"];

if(string.IsNullOrEmpty(ticket))

LogHelper.WriteLog(typeof(WeixinHelper),"获取临时二维码ticket失败"+result);

returnnull;

returnticket;

}

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

///summary

///生成带二维码的专属推广图片

////summary

///paramname="user"/param

///returns/returns

publicstringDraw(WxUseruser)

//背景图片

stringpath=Server.MapPath("/Content/images/tg.jpg");

System.Drawing.ImageimgSrc=System.Drawing.Image.FromFile(path);

//处理二维码图片大小240*240px

System.Drawing.ImageqrCodeImage=ReduceImage("/cgi-bin/showqrcodeticket="+user.ticket,240,240);

//处理头像图片大小100*100px

ImagetitleImage=ReduceImage(user.headimgurl,100,100);

using(Graphicsg=Graphics.FromImage(imgSrc))

//画专属推广二维码

g.DrawImage(qrCodeImage,newRectangle(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);

Fontfont=newFont("宋体",30,FontStyle.Bold);

g.DrawString(user.nickname,font,newSolidBrush(Color.Red),110,10);

stringnewpath=Server.MapPath(@"/Content/images/newtg_"+Guid.NewGui