Baidu Map get address information according to coordinates

Note: This method, if used for encoding, depends on the actual individual needs. Please refer to API parameter comments in detail.

Baidu Api:http://developer.baidu.com/map/index.php?title=webapi/guide/webservice-geocoding

Baidu Open Platform: http://developer.baidu.com/map/jsdemo.htm#c1_2

private string GetAddress (String lng, string lat) {try {string url = @ "h ttp://api.map.baidu.com/geocoder/v2/?ak=e4805d16520de693a3fe707cdc962045&callback=renderreverse&
                location= "+ Lat +", "+ LNG + @" &output=xml&pois=1 ";
                WebRequest request = webrequest.create (URL); Request.
                Method = "POST";
                XmlDocument xmldoc = new XmlDocument ();
                string senddata = Xmldoc.innerxml;

                byte[] ByteArray = Encoding.Default.GetBytes (SendData); Stream DataStream = Request.
                GetRequestStream ();
                Datastream.write (ByteArray, 0, bytearray.length);

                Datastream.close (); WebResponse response = Request.
                GetResponse (); DataStream = Response.
                GetResponseStream ();
                StreamReader reader = new StreamReader (DataStream, System.Text.Encoding.GetEncoding ("Utf-8")); String responseXML = reader.

                ReadToEnd ();
                XmlDocument XML = new XmlDocument (); Xml.
                LOADXML (Responsexml); String status = XML. Documentelement.selectsinglenode ("status").
                InnerText; if (status = = "0") {xmlnodelist nodes = XML.
                    Documentelement.getelementsbytagname ("formatted_address"); if (nodes. Count > 0) {return nodes[0].
                    InnerText;
                } else return "did not get location information, error code 3";
                } else {return ' did not get location information, error code 1 ';
            }} catch (System.Exception ex) {return "did not get location information, error code 2"; }
        }

Parameters in the URL:

Parameters	whether you must	Default Value	format Examples	meaning
Coordtype	Whether	Bd09ll	Bd09ll Baidu latitude and longitude coordinates	The type of coordinates, currently supported by the type of coordinates include: Bd09ll (Baidu latitude and longitude coordinates), GCJ02LL (national survey of latitude and longitude coordinates), Wgs84ll (GPS latitude and longitude)
Location	Is	No	38.76623,116.43213 lat< latitude >,lng< Longitude >	Get addresses based on latitude and longitude coordinates
POIs	Whether	0	0	Shows if the poi,0 around the specified location is not displayed, 1 is displayed. A value of 1 o'clock displays the POI within 100 meters of the perimeter.

Results returned by the Run method:

Room 1101-08, No. 27th Zhongguancun Street, Haidian District, Beijing

Results returned from the Baidu API:

<?xml version= "1.0" encoding= "Utf-8"?>-<GeocoderSearchResponse> <status>0</status>-<re Sult>-<location> <lat>39.983424051248</lat> <lng>116.32298703399</lng> </loc ation> <formatted_address> 27th, Zhongguancun Avenue, Haidian District, Beijing, 1101-08, room </formatted_address> <business> Zhongguancun, Renmin University, Suzhou Street, China </business>-<addressComponent> <streetnumber/> <street> Zhongguancun Avenue </street> <distri ct> Haidian District </district> <city> Beijing </city> <province> Beijing </province> </addresscomponen 
  T> <cityCode>131</cityCode>-<pois>-<poi> <addr> Zhongguancun West Side south (Zhongguancun Science Park) </addr> <distance>0.050000</distance> <name> Zhongguancun Building </name> <poiType> office Building, business building </poitype > <tel> (010) 82856666</tel> <zip>100000</zip>-<point> <x>116.32298658484& Lt;/x> <y>39.983423843929</y> </point> </poi>-<poi> <addr> 27th Zhongguancun Avenue </addr> <distance>0.05000 0</distance> <name> Meizhou Dongpo Restaurant Zhongguancun shop </name> <poiType> Chinese restaurant, dining </poiType> <tel> (010) 8285 6948</tel> <zip/>-<point> <x>116.32298658484</x> <y>39.983423843929</y& 
  Gt </point> </poi>-<poi> <addr> Zhongguancun Avenue 27th </addr> &LT;DISTANCE&GT;0.050000&LT;/DISTANCE&G 
  T <name> China People's property insurance Zhongguancun sales </name> <poiType> China People's property insurance, insurance company, Finance </poiType> <tel> (010) 82856779 </tel> <zip>100000</zip>-<point> <x>116.32298658484</x> <y>39.9834238 43929</y> </point> </poi>-<poi> <addr> Beijing Haidian </addr> <distance>94.432 081</distance> <name> Photosynthesis Study </name> <poiType> book audio, shopping </poiType> <tel/> < Zip/>-&Lt;point> <x>116.32239334388</x> <y>39.983890240676</y> </point> </poi>- <poi> <addr> Zhongguancun Avenue, 27th </addr> <distance>42.195731</distance> <name> CCB Zhongguancun Branch </ 
  name> <poiType> China Construction Bank, banking, finance </poiType> <tel/> <zip>100000</zip>-<point> 
  <x>116.32292037972</x> <y>39.983711118168</y> </point> </poi>-<poi>  
  <addr> Beijing Haidian District </addr> <distance>62.342644</distance> <name> Haidian Hospital-laser plastic Surgery and beauty Department </name> <poiType> Beauty salon, Life services </poiType> <tel/> <zip/>-<point> <x>116.32317954086 </x> <y>39.98301950182</y> </point> </poi>-<poi> <addr> Zhongguancun Avenue, 19th, new China customs shopping Center 1 floor </addr> <distance>112.983688</distance> <name> Starbucks New closing </name> <poiType> Starbucks , cafe, casual dining, dining &LT;/POITYPE&GT <tel> (010) 82486056</tel> <zip/>-<point> <x>116.32218215226</x> <y>39 .983899777278</y> </point> </poi> </pois> </result> &LT;/GEOCODERSEARCHRESPONSE&G T

XML Description:

name	type	Description
Status	constant	Returns the result status value, returns 0 successfully, and other values see appendix.
Location	Lat	Latitude coordinates
Lng	Longitude coordinates
Formatted_address	Structured address information
Business	Information in the business district, such as "Renmin University, Zhongguancun, Suzhou Street"
Addresscomponent	City	City Name
District	County name
Province	Province name
Street	Street name
Street_number	Street number
POIs (Peripheral poi Array)	Addr	Address information
Cp	Data sources
Distance	Distance from coordinate point
Name	Poi Name
Poitype	POI types, such as ' office building, business building '
Point	POI coordinates {x, y}
Tel	Phone
Uid	POI Unique identification
Zip	Zip

Appendix:

Return Code	definition
0	Normal
1	Server Internal Error
2	Invalid request parameter
3	Permission validation failed
4	Quota check failed
5	AK does not exist or is illegal
101	Service disabled
102	Not through the whitelist or the security code is wrong.
2xx	No permissions
3xx	Quota Error

Reprint Address http://www.cnblogs.com/_zjl/archive/2013/11/19/3431525.html