一、首先需要將微信的openid與系統用戶綁定。

在用戶關注公眾平臺的時候，回復一個鏈接，要求用戶綁定，可以設計如下消息進行回復，（openid最好進行加密處理，后者還需要用這個字段綁定fakeid）。

歡迎關注有問必答平臺,<a?href='http://myweixin123.duapp.com/bind.html?openid=@openid'>點擊此處進行用戶綁定</a>!

在bind.html頁面將openid與系統的usercode進行綁定，這個綁定過程非常簡單，這里不詳敘述。

二、將openid與fakeid進行綁定

微信公眾平臺是一回一答的模式；但是在微信公眾平臺后臺，可以向特定用戶進行消息發送。我們利用這個機制使用代碼去模擬這個過程來實現消息推送。

首先需要模擬登錄：

using?System; using?System.Collections.Generic; using?System.Linq; using?System.Web; using?System.Security.Cryptography; using?System.Text; using?System.Net; using?System.IO; using?System.Security.Authentication; using?System.Security.Cryptography.X509Certificates; /// <summary> ///WeiXinLogin 的摘要說明 /// </summary> public?class?WeiXinLogin { ???? ????/// <summary> ????/// MD5　32位加密 ????/// </summary> ????/// <param name="str"></param> ????/// <returns></returns> ????static?string?GetMd5Str32(string?str) ????{ ????????MD5CryptoServiceProvider md5Hasher = new?MD5CryptoServiceProvider(); ????????// Convert the input string to a byte array and compute the hash.? ????????char[] temp = str.ToCharArray(); ????????byte[] buf = new?byte[temp.Length]; ????????for?(int?i = 0; i < temp.Length; i++) ????????{ ????????????buf[i] = (byte)temp[i]; ????????} ????????byte[] data = md5Hasher.ComputeHash(buf); ????????// Create a new Stringbuilder to collect the bytes? ????????// and create a string.? ????????StringBuilder sBuilder = new?StringBuilder(); ????????// Loop through each byte of the hashed data?? ????????// and format each one as a hexadecimal string.? ????????for?(int?i = 0; i < data.Length; i++) ????????{ ????????????sBuilder.Append(data[i].ToString("x2")); ????????} ????????// Return the hexadecimal string.? ????????return?sBuilder.ToString(); ????} ????public?static?bool?ExecLogin(string?name,string?pass) ????{ ????????bool?result = false; ????????string?password = GetMd5Str32(pass).ToUpper(); ????????string?padata = "username="?+ name + "&pwd="?+ password + "&imgcode=&f=json"; ????????string?url = "https://mp.weixin.qq.com/cgi-bin/login?lang=zh_CN ";//請求登錄的URL ????????try ????????{ ????????????CookieContainer cc = new?CookieContainer();//接收緩存 ????????????byte[] byteArray = Encoding.UTF8.GetBytes(padata); // 轉化 ????????????HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(url);? //新建一個WebRequest對象用來請求或者響應url ????????????ServicePointManager.CertificatePolicy = new?AcceptAllCertificatePolicy(); ????????????webRequest2.CookieContainer = cc;????????????????????????????????????? //保存cookie? ????????????webRequest2.Method = "POST";????????????????????????????????????????? //請求方式是POST ????????????webRequest2.UserAgent = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.69 Safari/537.36"; ????????????webRequest2.Referer = "https://mp.weixin.qq.com/"; ????????????webRequest2.ContentType = "application/x-www-form-urlencoded";?????? //請求的內容格式為application/x-www-form-urlencoded ????????????webRequest2.ContentLength = byteArray.Length; ????????????Stream newStream = webRequest2.GetRequestStream();?????????? //返回用于將數據寫入 Internet 資源的 Stream。 ????????????// Send the data. ????????????newStream.Write(byteArray, 0, byteArray.Length);??? //寫入參數 ????????????newStream.Close(); ????????????HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse(); ????????????StreamReader sr2 = new?StreamReader(response2.GetResponseStream(), Encoding.Default); ????????????string?text2 = sr2.ReadToEnd(); ????????????//此處用到了newtonsoft來序列化 ????????????WeiXinRetInfo retinfo = Newtonsoft.Json.JsonConvert.DeserializeObject<WeiXinRetInfo>(text2); ????????????string?token = string.Empty; ????????????if?(retinfo.ErrMsg.Length > 0) ????????????{ ????????????????token = retinfo.ErrMsg.Split(new?char[] { '&'?})[2].Split(new?char[] { '='?})[1].ToString();//取得令牌 ????????????????LoginInfo.LoginCookie = cc; ????????????????LoginInfo.CreateDate = DateTime.Now; ????????????????LoginInfo.Token = token; ????????????????result = true; ????????????} ????????} ????????catch?(Exception ex) ????????{ ??????????? ????????????throw?new?Exception(ex.StackTrace); ????????} ????????return?result; ????} ????public?static?class?LoginInfo ????{ ????????/// <summary> ????????/// 登錄后得到的令牌 ????????/// </summary>??????? ????????public?static?string?Token { get; set; } ????????/// <summary> ????????/// 登錄后得到的cookie ????????/// </summary> ????????public?static?CookieContainer LoginCookie { get; set; } ????????/// <summary> ????????/// 創建時間 ????????/// </summary> ????????public?static?DateTime CreateDate { get; set; } ????} ????internal?class?AcceptAllCertificatePolicy : ICertificatePolicy ????{ ????????public?AcceptAllCertificatePolicy() ????????{ ????????} ????????public?bool?CheckValidationResult(ServicePoint sPoint, ???????????X509Certificate cert, WebRequest wRequest, int?certProb) ????????{ ????????????// Always accept? ????????????return?true; ????????} ????}? }

獲取fakeid

public?static?ArrayList SubscribeMP() { ????try ????{ ????????CookieContainer cookie = null; ????????string?token = null; ????????cookie = WeiXinLogin.LoginInfo.LoginCookie;//取得cookie ????????token = WeiXinLogin.LoginInfo.Token;//取得token ????????/*獲取用戶信息的url，這里有幾個參數給大家講一下，1.token此參數為上面的token 2.pagesize此參數為每一頁顯示的記錄條數 ????????3.pageid為當前的頁數，4.groupid為微信公眾平臺的用戶分組的組id，當然這也是我的猜想不一定正確*/ ????????string?Url = "https://mp.weixin.qq.com/cgi-bin/contactmanage?t=user/index&pagesize=10&pageidx=0&type=0&groupid=0&token="?+ token + "&lang=zh_CN"; ????????HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(Url); ????????webRequest2.CookieContainer = cookie; ????????webRequest2.ContentType = "text/html; charset=UTF-8"; ????????webRequest2.Method = "GET"; ????????webRequest2.UserAgent = "Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1"; ????????webRequest2.ContentType = "application/x-www-form-urlencoded"; ????????HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse(); ????????StreamReader sr2 = new?StreamReader(response2.GetResponseStream(), Encoding.Default); ????????string?text2 = sr2.ReadToEnd(); ????????MatchCollection mc; ????????//由于此方法獲取過來的信息是一個html網頁所以此處使用了正則表達式，注意：（此正則表達式只是獲取了fakeid的信息如果想獲得一些其他的信息修改此處的正則表達式就可以了。） ????????Regex r = new?Regex("\"id\"\\:\\d+,\"nick_name\""); //定義一個Regex對象實例 ????????mc = r.Matches(text2); ????????Int32 friendSum = mc.Count;????????? //好友總數 ????????string?fackID = ""; ????????ArrayList fackID1 = new?ArrayList(); ????????for?(int?i = 0; i < friendSum; i++) ????????{ ????????????//"id":208989515,"nick_name" ????????????fackID = mc[i].Value.Replace(",\"nick_name\"", "").Split(new?char[] { ':'?})[1]; ????????????fackID = fackID.Replace("\"", "").Trim(); ????????????fackID1.Add(fackID); ????????} ????????return?fackID1; ????} ????catch?(Exception ex) ????{ ????????throw?new?Exception(ex.StackTrace); ????} }

根據fakeid獲取openid

public static string GetOpenidByFakeid(string fakeid){try{CookieContainer cookie = null;string token = null;cookie = WeiXinLogin.LoginInfo.LoginCookie;//取得cookietoken = WeiXinLogin.LoginInfo.Token;//取得tokenstring Url = "https://mp.weixin.qq.com/cgi-bin/singlemsgpage?msgid=&source=&count=20&t=wxm-singlechat&fromfakeid=" + fakeid + "&token=" + token + "&lang=zh_CN";HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(Url);webRequest2.CookieContainer = cookie;webRequest2.ContentType = "text/html; charset=UTF-8";webRequest2.Method = "GET";webRequest2.UserAgent = "Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1";webRequest2.ContentType = "application/x-www-form-urlencoded";HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse();StreamReader sr2 = new StreamReader(response2.GetResponseStream(), Encoding.UTF8);string text2 = sr2.ReadToEnd();HtmlDocument doc = new HtmlDocument();doc.LoadHtml(text2);var str = doc.GetElementbyId("json-msgList").InnerHtml;JArray messages = JArray.Parse(str);foreach (var message in messages){string strContent = HttpUtility.HtmlDecode(message["content"].ToString());Regex reg = new Regex(@"(?is)<a[^>]*?href=(['""\s]?)(?<href>[^'""\s]*)\1[^>]*?>");MatchCollection match = reg.Matches(strContent);var href = "";foreach (Match m in match){href = m.Groups["href"].Value;}var openid = GetUrlParamValue(href, "openid");if (!string.IsNullOrEmpty(openid))return openid;}return "";}catch (Exception ex){return "";}}

?

由于之前有建立openid與usercode的關系，所以可以根據usercode找到openid，又可以根據openid找到fakeid。使用下面代碼進行推送：

public?static?bool?SendMessage(string?Message, string?fakeid) { ????bool?result = false; ????CookieContainer cookie = null; ????string?token = null; ????cookie = WeiXinLogin.LoginInfo.LoginCookie;//取得cookie ????token =? WeiXinLogin.LoginInfo.Token;//取得token ????string?strMsg = System.Web.HttpUtility.UrlEncode(Message);? //對傳遞過來的信息進行url編碼 ????string?padate = "type=1&content="?+ strMsg + "&error=false&tofakeid="?+ fakeid + "&token="?+ token + "&ajax=1"; ????string?url = "https://mp.weixin.qq.com/cgi-bin/singlesend?t=ajax-response&lang=zh_CN"; ????byte[] byteArray = Encoding.UTF8.GetBytes(padate); // 轉化 ????HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(url); ????webRequest2.CookieContainer = cookie; //登錄時得到的緩存 ????webRequest2.Referer = "https://mp.weixin.qq.com/cgi-bin/singlemsgpage?token="?+ token + "&fromfakeid="?+ fakeid + "&msgid=&source=&count=20&t=wxm-singlechat&lang=zh_CN"; ????webRequest2.Method = "POST"; ????webRequest2.UserAgent = "Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1"; ????webRequest2.ContentType = "application/x-www-form-urlencoded"; ????webRequest2.ContentLength = byteArray.Length; ????Stream newStream = webRequest2.GetRequestStream(); ????// Send the data.??????????? ????newStream.Write(byteArray, 0, byteArray.Length);??? //寫入參數??? ????newStream.Close(); ????HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse(); ????StreamReader sr2 = new?StreamReader(response2.GetResponseStream(), Encoding.Default); ????string?text2 = sr2.ReadToEnd(); ????if?(text2.Contains("ok")) ????{ ????????result = true; ????} ????return?result; }

　　

可以寫一個長期運行的windows服務用于建立fakeid和openid的關系，這里不再詳訴。

總結

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