【微信公众号】将微信公众号消息里的FromUserName即OpenID转成UnionID

小程序：扫一扫查出行
【扫一扫了解最新限行尾号】
复制小程序

最近在调试微信公众号开发者模式，处理公众号消息，收到如下回调消息内容

转成对象如下

{
"ToUserName":"gh_29********1",
"FromUserName":"oy****j4-7Z**********ys",
"CreateTime":"",
"MsgType":"text",
"Content":"李建华测试",
"MsgId":""
}

因为以前的网站分享业务使用的是另一套AppID，同一个用户在不同的AppID里获取到的OpenID是不同的，但是为了业务上的统一，准备都全部采用UnionID来作为用户唯一标识，所以需要将消息体中的FromUserName，也就是OpenID转成UnionID存储记录。以下是操作步骤：

1、获取Access_Token

var url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" +
AirwayKeeperModel.MPAppID + "&secret=" + AirwayKeeperModel.MPAppSecret;
var getToken = KTHttpRequest._Get(url);
var access_token = Newtonsoft.Json.JsonConvert.DeserializeObject<WxAccessTokenModel>(getToken);
if (access_token == null)
throw new JSJException("获取token返回null"); if (access_token.Errcode != )
throw new JSJException("获取token异常，错误码:" + access_token.Errcode + "，错误信息:" + access_token.Errmsg);

2、拉取用户信息

url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=" + access_token.AccessToken +
"&openid=" + req.OpenID.Trim() + "&lang=zh_CN";
var wxUserInfoJson = KTHttpRequest._Get(url);
var wxUserInfo = Newtonsoft.Json.JsonConvert.DeserializeObject<WxUserModel>(wxUserInfoJson);
if (null == wxUserInfo)
throw new JSJException("拉取用户微信信息返回null"); if ( != wxUserInfo.Errcode)
throw new JSJException("拉取用户微信信息异常，错误码:" + wxUserInfo.Errcode + "，错误信息:" + wxUserInfo.Errmsg); if (wxUserInfo.Subscribe != )
{
resp.ViewType = ;
throw new JSJException("您还没有关注空铁管家<i>长按识别关注，即可领取</i>");
}

最终获取到了如下数据

{"subscribe":,"openid":"oeQDZt0n4VCZ70wykBlGpANiXqdM","nickname":"背上吉他去旅行","sex":,"language":"zh_CN","city":"昌平","province":"北京","country":"中国","headimgurl":"http:\/\/wx.qlogo.cn\/mmopen\/kBwGJuwqK95jdsBeGnNrSn9GVUib491JqY8zlzEOLa920YACUUkJXLLDpVYlpMouRl2RA6vv9ibVUEpgFE90LH3b3uj7AYRjZP\/0","subscribe_time":,"unionid":"oGCG8t5SeisHItMA6sMUO0jPQTPw","remark":"","groupid":,"tagid_list":[]}

直观查看如下：