using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Net;

using System.IO;

using System.Xml;

using System.Xml.Linq;

using System.Windows.Forms;



namespace WindowsFormsApplication11

{

    class BaiduApi

    {

        public static string GetDistance(string rregion, string rcity, string dregion, string dcity)

        {

            string str = "";

            try

            {

                XDocument docbaidudis = XDocument.Load(Application.StartupPath + "\\baidudis.XML");

                int count = int.Parse(creatconxml());

                WebRequest request = WebRequest.Create("http://api.map.baidu.com/direction/v1?mode=driving&origin=" + rregion + "&destination=" + dregion + "&origin_region=" + rcity + "&destination_region=" + dcity + "&output=json&ak=" + docbaidudis.Element("sys").Element("key" + count.ToString()).Value);

                WebResponse response = request.GetResponse();

                StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("gb2312"));

                str = reader.ReadToEnd();

                reader.Close();

                reader.Dispose();

                response.Close();

                int statusindex = str.IndexOf("status");

                string status = str.Substring(statusindex + 8, 1);