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>
/// <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测试数据/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
/// <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测试数据/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
string imagepath = draw(user);
string result = httputility.uploadfile($ "https://api.weixin.qq测试数据/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，谢谢大家对服务器之家的支持。
原文链接：https://HdhCmsTestcnblogs测试数据/gracexu/p/10081111.html
dy("nrwz");
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