Read the global IP Access user region

This is explained in the first place. IP Library is QQ pure IP library dat file type

  public static string Qqippath = AppDomain.CurrentDomain.BaseDirectory + "\\ipdata\\qqwry.dat";///qq pure IP Library address 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>///constructor///</summary>///<param name= "Ipfilepath" > Pure IP database path </param        > Public Ipsearch (String ipfilepath) {This.ipfilepath = Ipfilepath;            }///<summary>///geography, including country and region///</summary> public struct Iplocation {        public string country, area; }///<summary>///Get the location of the specified IP///</summary>///<param name= "StrIP" > IP to be queried Site </param>        <returns></returns> Public iplocation getiplocation (string strIP) {IP = I            Ptolong (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;//Skip start IP ipfile.position = READLONGX (3) + 4;//skip End IP iplocation loc = new            Iplocation (); int flag = Ipfile.readbyte ();//Read flag if (flag = = 1)//indicates country and region being diverted {ipfile.position = Re                ADLONGX (3);            Flag = Ipfile.readbyte ();//re-read flag} 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>///Convert IP in string form to bit long///</summary>///<param name= "StrIP" >&lt  ;/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>///Convert the starting IP in the index block byte blocks to a long array///</summary>///<param name= "IPblock "></param> long[] Blocktoarray (byte[] ipblock) {long[] Iparray = new Long[ipblock.lengt            H/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>///search for the specified IP from the IP array and return its index///</summary>///<param name= "Iparray" IP array </param>///<param name= "Start" > Specify the starting position of the search </param>///<param name= "End" > Specify the end bit of the search             Place </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>///Read the index chunk in the IP file///</summary>///<returns></returns> byte[] Readipblock () {Long startposition = READLONGX (4);            Long endposition = READLONGX (4);            Long Count = (endposition-startposition)/7 + 1;//Total number of records ipfile.position = StartPosition;            byte[] IPblock = new Byte[count * 7];            Ipfile.read (ipblock, 0, ipblock.length);            Ipfile.position = startposition;        return ipblock; }///<summary>///Read the specified byte from the IP file and convert bit long///</summary>///<param name= "Bytescoun        T "> number of bytes needed to convert, idea not to exceed 8 bytes </param>///<returns></returns> long readlongx (int bytescount)            {byte[] _bytes = new Byte[8];            Ipfile.read (_bytes, 0, Bytescount);        Return Bitconverter.toint64 (_bytes, 0); }///<summary>///read string from IP file///</summary>///<param name= "flag" > Turn flag </        Param>///<returns></returns>string ReadString (int flag) {if (flag = = 1 | | flag = = 2)//turn sign ipfile.position = Readlon            GX (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 >) {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 filter///</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) {//may have an agent if (result.i Ndexof (".") = =-1)//No "."                Must be a non-IPv4 format result = "1.1.1.1"; else {if (result. IndexOf (",")! =-1) {//have ",", estimate multiple proxies.                             Take the first IP that is not an intranet. 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)! = "192.1"&& Temparyip[i].                            Substring (0, 7)! = "172.16.")    {return temparyip[i]; Locate the address that is not an intranet}}} else if (!i                    Serror (Result))//proxy is the IP format return result;   else result = "1.1.1.1"; Content in agent non-IP, Fetch IP}} string IpAddress = (HttpContext.Current.Request.ServerVaria bles["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; }    }

Read the global IP Access user region