C#的百度地图开发(三)依据坐标获取位置、商圈及周边信息

2019-11-14 15:59:18

字体：大中小

来源：转载

供稿：网友

我们得到了百度坐标，现在依据这一坐标来获取相应的信息。下面是相应的代码

[html] view plaincopy

public class BaiduMap { /// <summary> /// 依据坐标获取定位信息的URL模板。 /// 参数1:百度地图API的KEY。 /// 参数2:坐标(经度,纬度)。 /// </summary> public const string GEOCODING_COORDINATE_URL_TEMPLATE =

"http://api.map.baidu.com/geocoder/v2/?ak={0}&location={1}&output=json&pois=1"; /// <summary> /// 依据坐标获取定位信息 /// </summary> /// <param name="coordinates">坐标(经度,纬度)，多个坐标间用分号隔开</param> /// <param name="mapCoordinateType">坐标类型</param> /// <returns></returns> public static CoordLocationResult FetchLocation(String coordinates, MapCoordinateType mapCoordinateType) { CoordTransResult transformResult = TransToBaiduCoord(coordinates, mapCoordinateType); String info = ""; if (!transformResult.status.Equals(CoordTransStatus.OK)) { info = "坐标转换异常:状态是---" + transformResult.status.ToString(); return null; } if (transformResult.result == null || transformResult.result.Length <= 0) { info = "坐标转换异常:结果为空或数组长度为0"; return null; } String locationUrl = ""; foreach (Coordinate coordTemp in transformResult.result) { locationUrl = String.Format(GEOCODING_COORDINATE_URL_TEMPLATE, MAP_KEY_BAI_DU, coordTemp.x + "," + coordTemp.y); } String locationResponseText = RequestHelper.RequestUrl(locationUrl, null); CoordLocationResult locationResult = null; try { locationResult = Newtonsoft.Json.JsonConvert.DeserializeObject<CoordLocationResult>(locationResponseText); } catch (Exception e) { info = "定位异常:" + e.Message; return null; } return locationResult; } }

注:

(1).使用const常量来定义一个百度地图API的URL模板，方便后面的调用。

(2).TransToBaiduCoord函数是《C#的百度地图开发(二)转换JSON数据为相应的类》中将非百度坐标转换成百度坐标方法的封装。

(3).RequestUrl方法是《C#的百度地图开发(一)发起HTTP请求》所说的发起HTTP请求的封装。

(4).CoordLocationResult类的具体实现，请参看后面的代码。

[html]

view%20plaincopy

namespace MapApi.Baidu { [Serializable] public class CoordLocationResult { /// <summary> /// 状态 /// </summary> public String status { get; set; } /// <summary> /// 结果 /// </summary> public CoordLocationResult_Result result { get; set; } } #region CoordLocationResult_Result /// <summary> /// 定位结果 /// </summary> [Serializable] public class CoordLocationResult_Result { /// <summary> /// 定位的经度与纬度 /// </summary> public CoordLocationResult_Result_Location location { get; set; } /// <summary> /// 结构化地址信息 /// </summary> public String formatted_address { get; set; } /// <summary> /// 所在商圈信息，如 "人民大学,中关村,苏州街" /// </summary> public String business { get; set; } /// <summary> /// 定位的行政区域 /// </summary> public CoordLocationResult_Result_AddressComponent addressComponent { get; set; } /// <summary> /// 周边位置 /// </summary> public CoordLocationResult_Result_Poi[] pois { get; set; } /// <summary> /// 周边区域 /// </summary> public CoordLocationResult_Result_PoiRegion[] poiRegions { get; set; } /// <summary> /// 城市代码 /// </summary> public String cityCode { get; set; } } /// <summary> /// 定位结果之定位的经纬度 /// </summary> [Serializable] public class CoordLocationResult_Result_Location { /// <summary> /// 经度 /// </summary> public String lng { get; set; } /// <summary> /// 纬度 /// </summary> public String lat { get; set; } } /// <summary> /// 定位结果之行政区域 /// </summary> [Serializable] public class CoordLocationResult_Result_AddressComponent { /// <summary> /// 城市名 /// </summary> public String city { get; set; } /// <summary> /// 区县名 /// </summary> public String district { get; set; } /// <summary> /// 省名 /// </summary> public String PRovince { get; set; } /// <summary> /// 街道名 /// </summary> public String street { get; set; } /// <summary> /// 街道门牌号 /// </summary> public String street_number { get; set; } } #endregion #region CoordLocationResult_Result_Poi /// <summary> /// 周边位置信息 /// </summary> [Serializable] public class CoordLocationResult_Result_Poi { //"addr": "福建省厦门市湖里区嘉禾路388", // "cp": "NavInfo", // "direction": "西", // "distance": "49", // "name": "永同昌大厦", // "poiType": "商务大厦", // "point": { // "x": 118.13374113945, // "y": 24.501871673827 // }, // "tel": "", // "uid": "19c4b3f2642893beafb22a1e", // "zip": "" /// <summary> /// 地址信息 /// </summary> public String addr { get; set; } /// <summary> /// 数据来源 /// </summary> public String cp { get; set; } /// <summary> /// 方向 /// </summary> public String direction { get; set; } /// <summary> /// 离坐标点距离 /// </summary> public String distance { get; set; } /// <summary> /// poi名称 /// </summary> public String name { get; set; } /// <summary> /// poi类型，如’办公大厦,商务大厦’ /// </summary> public String poiType { get; set; } /// <summary> /// poi坐标{x,y} /// </summary> public Coordinate point { get; set; } /// <summary> /// 电话 /// </summary> public String tel { get; set; } /// <summary> /// poi唯一标识 /// </summary> public String uid { get; set; } /// <summary> /// 邮编 /// </summary> public String zip { get; set; } } #endregion #region CoordLocationResult_Result_PoiRegion /// <summary> /// 周边区域 /// </summary> [Serializable] public class CoordLocationResult_Result_PoiRegion { /// <summary> /// 目标方向。比如:内 /// </summary> public String direction_desc { get; set; } /// <summary> /// 区域名称。比如:音乐·家生活广场 /// </summary

注:类的构造方法依据前面所说的构造，也可以使用工具直接生成(链接)。

下面是测试代码

[html]

view%20plaincopy