"ASP." returns corresponding location information based on IP

In fact, the use of Baidu's IP library function interface, and then deal with the line, as follows:

Preparatory work:

1. Register as an open developer, create an app to get the AK key for Baidu API call, Baidu Development Center address:http://developer.baidu.com/

2.API Address: http://developer.baidu.com/map/index.php?title=webapi/ip-api#.E4.BD.BF.E7.94.A8.E6.96.B9.E6.B3.95

3. To prepare for development, proceed as follows:

(1) Get client IP

        /// <summary>Get client IP address (ignore proxy)</summary>        /// <returns>returns the loopback address if it fails</returns>         Public Static stringgethostaddress () {stringUserHostAddress =HttpContext.Current.Request.UserHostAddress; if(string. IsNullOrEmpty (userhostaddress)) {userhostaddress= httpcontext.current.request.servervariables["REMOTE_ADDR"]; }            //finally determine if the acquisition was successful and check the format of the IP address (it is important to check its format)            if(!string. IsNullOrEmpty (userhostaddress) &&IsIP (userhostaddress)) {                returnuserhostaddress; }            return "127.0.0.1"; }        /// <summary>        ///Check IP address format/// </summary>        /// <param name= "IP" ></param>        /// <returns></returns>         Public Static BOOLIsIP (stringIP) {            returnSystem.Text.RegularExpressions.Regex.IsMatch (IP,@"^ ((2[0-4]\d|25[0-5]|[ 01]?\d\d?) \.) {3} (2[0-4]\d|25[0-5]| [01]?\d\d?] $"); 

(2) Get the coding service address

        Private Const stringThe_key ="***************";//your AK key.        /// <summary>return UTF-8 encoded service address</summary>        /// <returns>Service Address</returns>         Public stringGetposturl (stringTheip) {            stringPostURL ="http://api.map.baidu.com/location/ip?ak="+ The_key +"&ip="+ Theip +"&coor=bd09ll"; returnPostURL; }

(3) Get the address resolution result through the service address

        /// <summary>return results (result of address resolution)</summary>         Public Static stringGetinfobyurl (stringURL) {            //You only need to pass the URL of the spell to the function when you call it. The return value can be judged            stringstrret =NULL; if(url = =NULL|| Url. Trim (). ToString () = ="")            {                returnstrret; }            stringTargetUrl =URL. Trim ().            ToString (); Try{HttpWebRequest hr=(HttpWebRequest) webrequest.create (TargetUrl); hr. UserAgent="mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"; hr. Method="GET"; hr. Timeout= -* -* +; WebResponse HS=HR.                GetResponse (); Stream SR=HS.                GetResponseStream (); StreamReader ser=NewStreamReader (SR, Encoding.default); Strret=ser.            ReadToEnd (); }            Catch(Exception ex) {strret=NULL; }            returnstrret; }

(4) The last simple call to the above method, and then convert the following string to the literal character

                string Theip = ymethod.gethostaddress ();                 string msg = Ymethod.getinfobyurl (Getposturl (THEIP));                 = System.Text.RegularExpressions.Regex.Unescape (msg);                Response.Write (msg);

Test address: http://ycdoit.com/test/getiptoad.aspx

"ASP." returns corresponding location information based on IP