Php公众号40029,微信开发之微信公众平台，网页授权及 40029 问题解决

本文将带你了解微信开发微信公众平台，网页授权及 40029 问题解决，希望本文对大家学微信有所帮助。

1、跳转授权链接

https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxx&redirect_uri=xxx&response_type=code&scope=snsapi_userinfo&state=STATE&connect_redirect=1#wechat_redirect

&connect_redirect=1    这个参数，刚开始没有加，总是报    {‘errcode’:40029,’errmsg’:’invalid code, hints: [ req_id: 0407ns44 ]’}    这个错误 ，调试时发现会访问两次，一次是301，页面重定向了，第二次跟第一次就差这个参数。加上后，不再报错。code   可以了。

二需要注意的是 redirect_uri   = xxx   需要自己URL转码

2、获取用户信息，直接上代码。

using   System;using System.Web;using Newtonsoft.Json.Linq;using System.Net;using   System.IO;using System.Text;public class getinfos : IHttpHandler {        public void ProcessRequest   (HttpContext context) {          //一切都从这里开始        string code =   context.Request[“code”].ToString();                context.Response.ContentType   = “text/plain”;          context.Response.Write(GetInfos(code));    }       public bool IsReusable {          get {            return   false;        }    }      public string GetInfos(string _code)      {        //        string _access_tokens =   GetToken(_code);        JObject json =   JObject.Parse(_access_tokens);                  string access_token = json[“access_token”].ToString();        string refresh_token = json[“refresh_token”].ToString();        string openid =   json[“openid”].ToString();                //        string _infos = GetUserInfo(access_token,   openid);        JObject info =   JObject.Parse(_infos);        if   (info[“errcode”] != null)          {                     _access_tokens = RefreshToken(refresh_token);            json =   JObject.Parse(_access_tokens);                                      access_token = json[“access_token”].ToString();            openid =   json[“openid”].ToString();            _infos =   GetUserInfo(access_token, openid);          }        return _infos;    }      ///    /// 用code   获取 Token    ///    private string GetToken(string   _code)    {        if (_code.IndexOf(“\””)   > -1)            _code =   _code.Replace(“\””, “”);                string URL =   “https://api.weixin.qq.com/sns/oauth2/access_token”;        string RequestPara =   “?appid=xxx”;          RequestPara += “&secret=xxx”;        RequestPara +=   “&code=” + _code;          RequestPara +=   “&grant_type=authorization_code”;        string _access_tokens = GetData(URL,   RequestPara);        _access_tokens =   _access_tokens.Replace(“\””, “‘”);        return _access_tokens;    }      ///    ///   获取用户信息    ///    private string GetUserInfo(string access_token,   string openid)    {        if   (access_token.IndexOf(“\””) > -1)            access_token = access_token.Replace(“\””,   “”);        if   (openid.IndexOf(“\””) > -1)            openid =   openid.Replace(“\””, “”);                string I_URL =   “https://api.weixin.qq.com/sns/userinfo”;        string I_RequestPara =   “?access_token=” + access_token;        I_RequestPara +=   “&openid=” + openid;          I_RequestPara += “&lang=zh_CN”;        string _infos = GetData(I_URL,   I_RequestPara);        _infos =   _infos.Replace(“\””, “‘”);        return _infos;    }      ///    /// 刷新   Token    ///    private string RefreshToken(string refresh_token)    {          if (refresh_token.IndexOf(“\””) > -1)            refresh_token =   refresh_token.Replace(“\””, “”);                string R_URL =   “https://api.weixin.qq.com/sns/oauth2/refresh_token”;        string R_RequestPara =   “?appid=xxx”;          R_RequestPara += “&grant_type=refresh_token”;        R_RequestPara +=   “&refresh_token=” + refresh_token;                string _infos =   GetData(R_URL, R_RequestPara);          _infos = _infos.Replace(“\””, “‘”);        return _infos;    }      ///    ///   访问地址，并获取数据    ///    private string GetData(string URL, string   RequestPara)    {        RequestPara =   RequestPara.IndexOf(‘?’) > -1 ? (RequestPara) : (“?” +   RequestPara);        WebRequest hr =   HttpWebRequest.Create(URL + RequestPara);        byte[] buf =   System.Text.Encoding.GetEncoding(“utf-8”).GetBytes(RequestPara);        hr.Method = “GET”;        System.Net.WebResponse response =   hr.GetResponse();        StreamReader   reader = new StreamReader(response.GetResponseStream(),   Encoding.GetEncoding(“utf-8”));        string ReturnVal =   reader.ReadToEnd();          reader.Close();          response.Close();        return   ReturnVal;    }}

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