Google Geolocation API - Use longitude and latitude to get address in textbox?

Question

I have noticed a lot of information about how to get your location using Google geolocation looks, based on IP address. But I am wondering if and how I could use this service t

Answer 1

Here is a c# implementation. Please note that I am no c# programmer - so the code might be ugly. But it works. It gives you more than just the address. This is a console application, you should be able to adapt it for webforms or winforms easily.

using System;
using System.Threading;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;
using System.Xml;
using System.Xml.XPath;

namespace ReverseGeoLookup
{
 // http://code.google.com/apis/maps/documentation/geocoding/#ReverseGeocoding
    public static string ReverseGeoLoc(string longitude, string latitude,
        out string Address_ShortName,
        out string Address_country,
        out string Address_administrative_area_level_1,
        out string Address_administrative_area_level_2,
        out string Address_administrative_area_level_3,
        out string Address_colloquial_area,
        out string Address_locality,
        out string Address_sublocality,
        out string Address_neighborhood)
    {

        Address_ShortName = "";
        Address_country = "";
        Address_administrative_area_level_1 = "";
        Address_administrative_area_level_2 = "";
        Address_administrative_area_level_3 = "";
        Address_colloquial_area = "";
        Address_locality = "";
        Address_sublocality = "";
        Address_neighborhood = "";

        XmlDocument doc = new XmlDocument();

        try
        {
            doc.Load("http://maps.googleapis.com/maps/api/geocode/xml?latlng=" + latitude + "," + longitude + "&sensor=false");
            XmlNode element = doc.SelectSingleNode("//GeocodeResponse/status");
            if (element.InnerText == "ZERO_RESULTS")
            {
                return ("No data available for the specified location");
            }
            else
            {

                element = doc.SelectSingleNode("//GeocodeResponse/result/formatted_address");

                string longname="";
                string shortname="";
                string typename ="";
                bool fHit=false;


                XmlNodeList xnList = doc.SelectNodes("//GeocodeResponse/result/address_component");
                foreach (XmlNode xn in xnList)
                {
                    try
                    {
                        longname = xn["long_name"].InnerText;
                        shortname = xn["short_name"].InnerText;
                        typename = xn["type"].InnerText;


                        fHit = true;
                        switch (typename)
                        {
                            //Add whatever you are looking for below
                            case "country":
                                {
                                    Address_country = longname;
                                    Address_ShortName = shortname;
                                    break;
                                }

                            case "locality":
                                {
                                    Address_locality = longname;
                                    //Address_locality = shortname; //Om Longname visar sig innehålla konstigheter kan man använda shortname istället
                                    break;
                                }

                            case "sublocality":
                                {
                                    Address_sublocality = longname;
                                    break;
                                }

                            case "neighborhood":
                                {
                                    Address_neighborhood = longname;
                                    break;
                                }

                            case "colloquial_area":
                                {
                                    Address_colloquial_area = longname;
                                    break;
                                }

                            case "administrative_area_level_1":
                                {
                                    Address_administrative_area_level_1 = longname;
                                    break;
                                }

                            case "administrative_area_level_2":
                                {
                                    Address_administrative_area_level_2 = longname;
                                    break;
                                }

                            case "administrative_area_level_3":
                                {
                                    Address_administrative_area_level_3 = longname;
                                    break;
                                }

                            default:
                                fHit = false;
                                break;
                        }


                        if (fHit)
                        {
                            Console.Write(typename);
                            Console.ForegroundColor = ConsoleColor.Green;
                            Console.Write("\tL: " + longname + "\tS:" + shortname + "\r\n");
                            Console.ForegroundColor = ConsoleColor.Gray;
                        }
                    }

                    catch (Exception e)
                    {
                        //Node missing either, longname, shortname or typename
                        fHit = false;
                        Console.Write(" Invalid data: ");
                        Console.ForegroundColor = ConsoleColor.Red;
                        Console.Write("\tX: " + xn.InnerXml + "\r\n");
                        Console.ForegroundColor = ConsoleColor.Gray;
                    }


                }

                //Console.ReadKey();
                return (element.InnerText);
            }

        }
        catch (Exception ex)
        {
            return ("(Address lookup failed: ) " + ex.Message);
        }
        }
}