读取全球ip获取用户地区

这个 首先说明下。ip库是qq纯真ip库 dat文件类型

  public static string QQipPath = AppDomain.CurrentDomain.BaseDirectory + "\\ipdata\\qqwry.dat";///QQ纯真ip库地址


       public static string GetCity(string IP)
        {
            string ipfilePath = QQipPath;
            IPSearch ipSearch = new IPSearch(ipfilePath);
            IPSearch.IPLocation loc = ipSearch.GetIPLocation(IP);
            return loc.country;
        }


  public class IPSearch
    {
        FileStream ipFile;
        long ip;
        string ipfilePath;

        ///<summary>
        /// 构造函数
        ///</summary>
        ///<param name="ipfilePath">纯真IP数据库路径</param>
        public IPSearch(string ipfilePath)
        {
            this.ipfilePath = ipfilePath;
        }

        ///<summary>
        /// 地理位置,包括国家和地区
        ///</summary>
        public struct IPLocation
        {
            public string country, area;
        }
        ///<summary>
        /// 获取指定IP所在地理位置
        ///</summary>
        ///<param name="strIP">要查询的IP地址</param>
        ///<returns></returns>
        public IPLocation GetIPLocation(string strIP)
        {
            ip = IPToLong(strIP);
            ipFile = new FileStream(ipfilePath, FileMode.Open, FileAccess.Read);
            long[] ipArray = BlockToArray(ReadIPBlock());
            long offset = SearchIP(ipArray, 0, ipArray.Length - 1) * 7 + 4;
            ipFile.Position += offset;//跳过起始IP
            ipFile.Position = ReadLongX(3) + 4;//跳过结束IP

            IPLocation loc = new IPLocation();
            int flag = ipFile.ReadByte();//读取标志
            if (flag == 1)//表示国家和地区被转向
            {
                ipFile.Position = ReadLongX(3);
                flag = ipFile.ReadByte();//再读标志
            }
            long countryOffset = ipFile.Position;
            loc.country = ReadString(flag);

            if (flag == 2)
            {
                ipFile.Position = countryOffset + 3;
            }
            flag = ipFile.ReadByte();
            loc.area = ReadString(flag);

            ipFile.Close();
            ipFile = null;
            return loc;
        }
        ///<summary>
        /// 将字符串形式的IP转换位long
        ///</summary>
        ///<param name="strIP"></param>
        ///<returns></returns>
        public long IPToLong(string strIP)
        {
            byte[] ip_bytes = new byte[8];
            string[] strArr = strIP.Split(new char[] { '.' });
            if (strArr.Length - 1 >= 3)
            {
                for (int i = 0; i < 4; i++)
                {
                    ip_bytes[i] = byte.Parse(strArr[3 - i]);
                }
            }
            return BitConverter.ToInt64(ip_bytes, 0);
        }
        ///<summary>
        /// 将索引区字节块中的起始IP转换成Long数组
        ///</summary>
        ///<param name="ipBlock"></param>
        long[] BlockToArray(byte[] ipBlock)
        {
            long[] ipArray = new long[ipBlock.Length / 7];
            int ipIndex = 0;
            byte[] temp = new byte[8];
            for (int i = 0; i < ipBlock.Length; i += 7)
            {
                Array.Copy(ipBlock, i, temp, 0, 4);
                ipArray[ipIndex] = BitConverter.ToInt64(temp, 0);
                ipIndex++;
            }
            return ipArray;
        }
        ///<summary>
        /// 从IP数组中搜索指定IP并返回其索引
        ///</summary>
        ///<param name="ipArray">IP数组</param>
        ///<param name="start">指定搜索的起始位置</param>
        ///<param name="end">指定搜索的结束位置</param>
        ///<returns></returns>
        int SearchIP(long[] ipArray, int start, int end)
        {
            int middle = (start + end) / 2;
            if (middle == start)
                return middle;
            else if (ip < ipArray[middle])
                return SearchIP(ipArray, start, middle);
            else
                return SearchIP(ipArray, middle, end);
        }
        ///<summary>
        /// 读取IP文件中索引区块
        ///</summary>
        ///<returns></returns>
        byte[] ReadIPBlock()
        {
            long startPosition = ReadLongX(4);
            long endPosition = ReadLongX(4);
            long count = (endPosition - startPosition) / 7 + 1;//总记录数
            ipFile.Position = startPosition;
            byte[] ipBlock = new byte[count * 7];
            ipFile.Read(ipBlock, 0, ipBlock.Length);
            ipFile.Position = startPosition;
            return ipBlock;
        }
        ///<summary>
        /// 从IP文件中读取指定字节并转换位long
        ///</summary>
        ///<param name="bytesCount">需要转换的字节数，主意不要超过8字节</param>
        ///<returns></returns>
        long ReadLongX(int bytesCount)
        {
            byte[] _bytes = new byte[8];
            ipFile.Read(_bytes, 0, bytesCount);
            return BitConverter.ToInt64(_bytes, 0);
        }
        ///<summary>
        /// 从IP文件中读取字符串
        ///</summary>
        ///<param name="flag">转向标志</param>
        ///<returns></returns>
        string ReadString(int flag)
        {
            if (flag == 1 || flag == 2)//转向标志
                ipFile.Position = ReadLongX(3);
            else
                ipFile.Position -= 1;

            List<byte> list = new List<byte>();
            byte b = (byte)ipFile.ReadByte();
            while (b > 0)
            {
                list.Add(b);
                b = (byte)ipFile.ReadByte();
            }
            return Encoding.Default.GetString(list.ToArray());
        }

        public string GetUserIp()
        {
            string ip;
            bool isErr = false;
            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"] == null)
                ip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
            else
                ip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"].ToString();
            if (ip.Length > 15)
            {
                if (ip.Contains(","))
                {
                    ip = ip.Split(',')[0];
                    isErr = IsError(ip);
                }
                else
                {
                    isErr = true;
                }
            }
            else
            {
                isErr = IsError(ip);
            }
            if (isErr)
                return "1.1.1.1";
            else
                return ip;
        }
        /// <summary>
        /// ip过滤
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        protected bool IsError(string ip)
        {
            string[] temp;
            bool isErr = false;
            temp = ip.Split('.');
            if (temp.Length == 4)
            {
                for (int i = 0; i < temp.Length; i++)
                {
                    if (temp[i].Length > 3) isErr = true;
                }
            }
            else
                isErr = true;
            return isErr;
        }

        public string GetIpAddress()
        {
            string result = String.Empty;
            result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (result != null && result != String.Empty)
            {
                //可能有代理     
                if (result.IndexOf(".") == -1)    //没有"."肯定是非IPv4格式     
                    result = "1.1.1.1";
                else
                {
                    if (result.IndexOf(",") != -1)
                    {
                        //有","，估计多个代理。取第一个不是内网的IP。     
                        result = result.Replace(" ", "").Replace("\"","");
                        string[] temparyip = result.Split(",;".ToCharArray());
                        for (int i = 0; i < temparyip.Length; i++)
                        {
                            if (!IsError(temparyip[i])
                                && temparyip[i].Substring(0, 3) != "10."
                                && temparyip[i].Substring(0, 7) != "192.168"
                                && temparyip[i].Substring(0, 7) != "172.16.")
                            {
                                return temparyip[i];    //找到不是内网的地址     
                            }
                        }
                    }
                    else if (!IsError(result)) //代理即是IP格式     
                        return result;
                    else
                        result = "1.1.1.1";   //代理中的内容 非IP，取IP     
                }
            }
            string IpAddress = (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != String.Empty) ? HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] : HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            if (null == result || result == String.Empty)
                result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            if (result == null || result == String.Empty)
                result = HttpContext.Current.Request.UserHostAddress;
            return result;
        }
    }