C#实现微信公众号群发消息(解决一天只能发一次的限制)实例分享

总体思路：

1.首先必须要在微信公众平台上申请一个公众号。

2.然后进行模拟登陆。（由于我对http传输原理和编程不是特别懂，在模拟登陆的地方，不是特别清楚，希望有大神指教）

3.模拟登陆后会获得一个token（令牌）和cookie。

4.因为模拟登陆后相当于就进入了微信公众平台，在这个里面就可以抓取到需要的数据，如公众好友的昵称，fakeid。其中的fakeid非常重要，因为传输数据必须要知道对方的fakeid。

5.知道对方的fakeid就可以进行数据的发送了。

这里是整个项目的源码下载：

不过里面还有一些小问题，希望有人继续修改和讨论！也有人说这样会被封号，所以请谨慎操作
讲一下我项目里面的主要内容
1.weixinlogin.cs类是用来执行登陆功能的

//对密码进行md5加密
 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();
    }
//执行登陆操作
    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 = "http://mp.weixin.qq.com/cgi-bin/login?lang=zh_cn ";//请求登录的url
        try
        {
            cookiecontainer cc = new cookiecontainer();//接收缓存
            byte[] bytearray = encoding.utf8.getbytes(padata); // 转化
            httpwebrequest webrequest2 = (httpwebrequest)webrequest.create(url);  //新建一个webrequest对象用来请求或者响应url
            webrequest2.cookiecontainer = cc;                                      //保存cookie 
            webrequest2.method = "post";                                          //请求方式是post
            webrequest2.contenttype = "application/x-www-form-urlencoded";       //请求的内容格式为application/x-www-form-urlencoded
            webrequest2.contentlength = bytearray.length;
            stream newstream = webrequest2.getrequeststream();           //返回用于将数据写入 internet 资源的 stream。
            // send the data.
            newstream.write(bytearray, 0, bytearray.length);    //写入参数
            newstream.close();
            httpwebresponse response2 = (httpwebresponse)webrequest2.getresponse();
            streamreader sr2 = new streamreader(response2.getresponsestream(), encoding.default);
            string text2 = sr2.readtoend();
            //此处用到了newtonsoft来序列化
            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>
        /// 登录后得到的令牌
        /// </summary>       
        public static string token { get; set; }
        /// <summary>
        /// 登录后得到的cookie
        /// </summary>
        public static cookiecontainer logincookie { get; set; }
        /// <summary>
        /// 创建时间
        /// </summary>
        public static datetime createdate { get; set; }
    }

2.在weixin.cs类中实现发送数据

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);  //对传递过来的信息进行url编码
        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); // 转化
        httpwebrequest webrequest2 = (httpwebrequest)webrequest.create(url);
        webrequest2.cookiecontainer = cookie; //登录时得到的缓存
        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);    //写入参数   
        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;
    }

3.sendmessage.aspx.cs中主要实现获取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
            /*获取用户信息的url，这里有几个参数给大家讲一下，1.token此参数为上面的token 2.pagesize此参数为每一页显示的记录条数
            3.pageid为当前的页数，4.groupid为微信公众平台的用户分组的组id，当然这也是我的猜想不一定正确*/
            string url = "https://mp.weixin.qq.com/cgi-bin/contactmanagepage?t=wxm-friend&token=" + token + "&lang=zh_cn&pagesize=10&pageidx=0&type=0&groupid=0";
            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;
            //由于此方法获取过来的信息是一个html网页所以此处使用了正则表达式，注意：（此正则表达式只是获取了fakeid的信息如果想获得一些其他的信息修改此处的正则表达式就可以了。）
             regex r = new regex("\"fakeid\"\\s\\:\\s\"\\d+\""); //定义一个regex对象实例
            mc = r.matches(text2);
            int32 friendsum = mc.count;          //好友总数
            string fackid ="";
            arraylist fackid1 = new arraylist();
            for (int i = 0; i < friendsum; i++)
            {
                fackid = mc[i].value.split(new char[] { ':' })[1];
                fackid = fackid.replace("\"", "").trim();
                fackid1.add(fackid);
            }
            return fackid1;
   }
        catch (exception ex)
        {
            throw new exception(ex.stacktrace);
        }
    }