using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using HttpLib;
using Chsword;
using System.Collections.Specialized;
using System.Text.RegularExpressions;
using System.Web;


namespace WeiYunLib
{
    public class WeiYunAPI
    {
        CookieContainer WeiYunCookies = new CookieContainer();
        public WeiYunAPI()
        { }
        /// <summary>
        /// 进行MD5加密
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string EncyptMD5(string s)
        {
            System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5CryptoServiceProvider.Create();
            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(s);
            byte[] bytes1 = md5.ComputeHash(bytes);

            System.Text.StringBuilder sb = new StringBuilder();
            foreach (var item in bytes1)
            {
                sb.Append(item.ToString("x").PadLeft(2, ‘0‘));
            }
            return sb.ToString().ToUpper();
        }
        public string GetToken(string skey)
        {
            int hash = 5381;
            string md5_key = "tencentQQVIP123443safde&!%^%1282";
            return EncyptMD5((hash << 5).ToString() + md5_key);
        }
        public bool GetDirectUrl(string sourceUrl, StringBuilder decodeUrl)
        {
            try
            {
                string getUrl = sourceUrl;
                string referer = sourceUrl;
                HttpHelper http = new HttpHelper();
                HttpItem item = new HttpItem()
                {
                    URL = getUrl,//URL     必需项
                    Method = "get",//URL     可选项 默认为Get
                    ResultType = ResultType.String,
                    CookieContainer = WeiYunCookies
                };
                HttpResult result = http.GetHtml(item);
                if (result.StatusCode == HttpStatusCode.Found)
                {
                    string tmpUrl = result.Header["Location"] == null ? string.Empty : result.Header["Location"].ToString();
                    if (tmpUrl != string.Empty)
                        sourceUrl = tmpUrl;
                    else
                        return false;
                }

                string share_key = sourceUrl.Substring(sourceUrl.LastIndexOf(‘/‘) + 1);

                //string jsonStr = string.Format("")
                StringBuilder sbJson = new StringBuilder();
                sbJson.AppendLine("{");
                sbJson.AppendLine("\"req_header\": {");
                sbJson.AppendLine("\"cmd\": \"view_share\",");
                sbJson.AppendLine("\"main_v\": 11,");
                sbJson.AppendLine("\"proto_ver\": 10006,");
                sbJson.AppendLine("\"sub_v\": 1,");
                sbJson.AppendLine("\"encrypt\": 0,");
                sbJson.AppendLine("\"msg_seq\": 1,");
                sbJson.AppendLine("\"source\": 30111,");
                sbJson.AppendLine("\"appid\": 30111,");
                sbJson.AppendLine("\"client_ip\": \"127.0.0.1\",");
                sbJson.AppendLine("\"token\": \"" + GetToken(string.Empty) + "\"");
                sbJson.AppendLine("},");
                sbJson.AppendLine("\"req_body\": {");
                sbJson.AppendLine("\"share_key\": \"" + share_key + "\"");
                sbJson.AppendLine("}");
                sbJson.AppendLine("}");
                dynamic json = new JDynamic(sbJson.ToString());
                var values = new NameValueCollection();
                values["_"] = "1387991017986";
                values["callback"] = "Get_Info";
                values["data"] = json.ToString();
                values["g_tk"] = "";
                getUrl = "http://web2.cgi.weiyun.com/wy_share_v2.fcg";
                referer = sourceUrl;
                http = new HttpHelper();
                item = new HttpItem()
                {
                    URL = getUrl,//URL     必需项
                    Method = "get",//URL     可选项 默认为Get
                    Referer = referer,
                    Getdata = HttpHelper.GetDataToString(values),
                    ResultType = ResultType.String,
                    CookieContainer = WeiYunCookies
                };
                result = http.GetHtml(item);

                if (result.StatusCode == System.Net.HttpStatusCode.OK)
                {
                    var match = Regex.Match(result.Html, "(?<=(" + "try{Get_Info\\(" + "))[.\\s\\S]*?(?=(" + "\\)}catch\\(e\\){};" + "))");
                    if (match.Captures.Count > 0)
                    {

                        //return HttpUtility.UrlDecode(match.Value.ToString());

                        dynamic rjson = new JDynamic(HttpUtility.UrlDecode(match.Value.ToString()));

                        values = new NameValueCollection();
                        values["browser"] = "mozilla";
                        values["dir"] = "";
                        values["err_callback"] = "http://www.weiyun.com/web/callback/iframe_share_down_fail.html";
                        values["fid"] = rjson.rsp_body.file_list[0].file_id;
                        values["os_info"] = "windows";
                        values["pdir"] = rjson.rsp_body.pdir_key;
                        values["sharekey"] = rjson.rsp_body.share_key;
                        values["skey"] = "";
                        values["uin"] = rjson.rsp_body.uin.ToString();
                        values["ver"] = "12";
                        values["zn"] = rjson.rsp_body.file_list[0].file_name;
                        //设置cookies
                        Cookie cookie = new Cookie("dlskey", rjson.rsp_body.dlskey, "/", "web.cgi.weiyun.com");
                        WeiYunCookies.Add(cookie);
                        ////设置header 防止返回乱码
                        //WebHeaderCollection header = new WebHeaderCollection();
                        //header.Add("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");
                        //header.Add("Accept-Encoding", "gzip,deflate,sdch");
                        //header.Add("Accept-Language", "en-US,en;q=0.8,zh-CN;q=0.6,zh;q=0.4");
                        getUrl = "http://web.cgi.weiyun.com/share_dl.fcg";
                        referer = sourceUrl;
                        http = new HttpHelper();
                        item = new HttpItem()
                        {
                            URL = getUrl,//URL     必需项
                            Method = "post",//URL     可选项 默认为Get
                            PostDataType = PostDataType.String,
                            Referer = referer,
                            Postdata = HttpHelper.PostDataToString(values),
                            ResultType = ResultType.String,
                            ContentType = "application/x-www-form-urlencoded",
                            CookieContainer = WeiYunCookies,
                        };
                        result = http.GetHtml(item);
                        {
                            if (result.StatusCode == HttpStatusCode.Found)
                            {
                                string failedURL = "http://www.weiyun.com/web/callback/iframe_share_down_fail.html";
                                string tmpUrl = result.Header["Location"] == null ? string.Empty : result.Header["Location"].ToString();
                                if (tmpUrl != string.Empty)
                                {
                                    if (tmpUrl.IndexOf(failedURL) >= 0)
                                        return false;
                                    decodeUrl.Append(EncodeFilename(tmpUrl));
                                    return true;
                                }

                            }
                        }

                    }
                }
                return false;
            }
            catch (System.Exception ex)
            {
                return false;
            }
        }
        public static string EncodeFilename(string filename)
        {
            byte[] arrb = Encoding.Unicode.GetBytes(filename);
            List<byte> lb = new List<byte>();
            foreach (byte b in arrb)
            {
                if (b != 0)
                    lb.Add(b);
            }
            return Encoding.UTF8.GetString(lb.ToArray());
        }
    }
}

            WeiYunLib.WeiYunAPI weiyun = new WeiYunLib.WeiYunAPI();
            StringBuilder str = new StringBuilder();
            if (weiyun.GetDirectUrl(textBox1.Text, str))
                textBox2.Text = str.ToString();