Get geo-location based on IP address

    ///<summary>    ///provide the method of searching IP information from the pure IP database;///</summary>     Public classIpselect {FileStream ipfile; LongIP;  Public stringIpfilepath; ///<summary>        ///constructor Function///</summary>        ///<param name= "Ipfilepath" >Pure IP Database path</param>         PublicIpselect () {Ipfilepath="Pure IP Database path";//Textutility.getfullpath (utility.getipdbfilepath);        }        ///<summary>        ///location, including country and region///</summary>         Public structiplocation { Public stringcountry, area; }        ///<summary>        ///gets the location entity where the specified IP resides///</summary>        ///<param name= "StrIP" >the IP address to query</param>        ///<returns></returns>         Public stringGetiplocation (stringStrIP) {            if(!file.exists (Ipfilepath)) {                return ""; } IP= Iptolong (StrIP);//Converts the IP in the form of a string to a bit longIplocation loc =Newiplocation (); Try{ipfile=NewFileStream (Ipfilepath, FileMode.Open, FileAccess.Read);//file Stream                Long[] Iparray = Blocktoarray (Readipblock ());//                Longoffset = searchip (Iparray,0, Iparray.length-1) *7+4; Ipfile.position+ = offset;//Skip Start IPIpfile.position = Readlongx (3) +4;//Skip End IP                intFlag = Ipfile.readbyte ();//Read Flags                if(Flag = =1)//indicates that the country and region have been diverted{ipfile.position= Readlongx (3); Flag= Ipfile.readbyte ();//re-read flag                }                LongCountryoffset =ipfile.position; Loc.country=ReadString (flag); if(Flag = =2) {ipfile.position= Countryoffset +3; } Flag=Ipfile.readbyte (); Loc.area=ReadString (flag);                Ipfile.close (); Ipfile=NULL; }            Catch            {                return ""; }            returnLoc.country +Loc.area; }        ///<summary>        ///Converts the IP in the form of a string to a bit long///</summary>        ///<param name= "StrIP" ></param>        ///<returns></returns>         Public LongIptolong (stringStrIP) {            byte[] Ip_bytes =New byte[8]; string[] Strarr = Strip.split (New Char[] {'.' } );  for(inti =0; I <4; i++) {Ip_bytes[i]=byte. Parse (strarr[3-i]); }            returnBitconverter.toint64 (Ip_bytes,0 ); }        ///<summary>        ///converts the starting IP in an indexed block of bytes into a long array///</summary>        ///<param name= "IPblock" ></param>        Long[] Blocktoarray (byte[] ipblock) {            Long[] Iparray =New Long[Ipblock.length/7]; intIpindex =0; byte[] temp =New byte[8];  for(inti =0; i < ipblock.length; i + =7) {array.copy (ipblock, I, temp,0,4 ); Iparray[ipindex]= Bitconverter.toint64 (temp,0 ); Ipindex++; }            returnIparray; }        ///<summary>        ///searches the IP array for the specified IP and returns its index///</summary>        ///<param name= "Iparray" >IP Array</param>        ///<param name= "Start" >Specify the starting location for the search</param>        ///<param name= "End" >specify where to end the search</param>        ///<returns></returns>        intSearchip (Long[] Iparray,intStartintend) {            intMiddle = (start + end)/2; if(middle = =start)returnMiddle; Else if(IP <Iparray[middle])returnsearchip (Iparray, start, middle); Else                returnsearchip (Iparray, middle, end); }        ///<summary>        ///reading an indexed chunk in an IP file///</summary>        ///<returns></returns>        byte[] Readipblock () {LongStartPosition = Readlongx (4 ); LongEndposition = Readlongx (4 ); LongCount = (endposition-startposition)/7+1;//Total Record CountIpfile.position =startposition; byte[] IPblock =New byte[Count *7]; Ipfile.read (IPblock,0, ipblock.length); Ipfile.position=startposition; returnIPblock; }        ///<summary>        ///reads the specified byte from an IP file and converts a bit long///</summary>        ///<param name= "Bytescount" >number of bytes to convert, not more than 8 bytes in mind</param>        ///<returns></returns>        LongREADLONGX (intBytescount) {            byte[] _bytes =New byte[8]; Ipfile.read (_bytes,0, Bytescount); returnBitconverter.toint64 (_bytes,0 ); }        ///<summary>        ///reading a string from an IP file///</summary>        ///<param name= "Flag" >Steering Signs</param>        ///<returns></returns>        stringReadString (intflag) {            if(Flag = =1|| Flag = =2)//Steering SignsIpfile.position = Readlongx (3 ); Elseipfile.position-=1; List<byte> list =Newlist<byte>(); byteB = (byte) Ipfile.readbyte ();  while(B >0) {list.                ADD (b); b= (byte) Ipfile.readbyte (); }            returnEncoding.Default.GetString (list.        ToArray ()); }    }

        /// <summary>        ///depending on the location of the IP/// </summary>        /// <param name= "IP" >IP</param>        /// <returns>location</returns>        protected stringGetaddresswithip (stringIP) {Ipselect Ipselect=NewIpselect (); if(string. IsNullOrEmpty (IP)) {IP="127.0.0.1"; }            returnipselect.getiplocation (IP); }

Pure IP Database format document in Baidu Cloud Network Disk "Programming Tools Files" folder

Get geo-location based on IP address