新浪微博的地址加密方式是什么？
在新粮微博里插入一个视频地址或者音频地址，会自动将地址变成类似这样的http://t.cn/h5hrB7，请问这是用的什么加密方式，能将长地址变成这么短？

[解决办法]
这个方法是新浪自己定的，除非开发API给你，否则没有办法。
google 也有这种功能 http://goo.gl/

相关API调用

C# code

        /// <summary>        /// 调用Google API 生成短网址        /// </summary>        /// <param name="longUrl">长地址</param>        /// <returns>短网址</returns>        public static string GetShortUrl(string longUrl)        {            CookieContainer cc = new CookieContainer();            string url = "http://goo.gl/api/shorten";            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);            request.Method = "POST";            request.ContentType = "application/x-www-form-urlencoded";            request.CookieContainer = cc;            string data = "url=" + HttpUtility.UrlEncode(longUrl) + "&security_token=";            request.ContentLength = data.Length;            StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII);            writer.Write(data);            writer.Flush();            HttpWebResponse response = (HttpWebResponse)request.GetResponse();            string encoding = response.ContentEncoding;            if (encoding == null || encoding.Length < 1)            {                encoding = "utf-8"; //默认编码            }            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));            data = reader.ReadToEnd();            response.Close();            return data;        }