C#实现微信公众号群发消息（解决一天只能发一次的限制）

经过几天研究网上的代码和谢灿大神的帮忙，今天终于用C#实现了微信公众号群发消息，现在整理一下。

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。

我整个项目的代码在下载里面有

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);

}

}