C#百度定位API使用

1、定义一个存储百度API返回json结果对象的类：

注：解析json字符串的方式有很多，无需局限于本文这一种。

    public class baidu_location    {        [Serializable]        //存储百度定位API返回结果类        public class AddressForQueryIPFromBaidu {            public string Address { get; set; }            public Content Content { get; set; }            public string Status { get; set; }        }        [Serializable]        public class Content {            public string Address { get; set; }            public Address_Detail Address_Detail { get; set; }            public Point Point { get; set; }        }        [Serializable]        public class Address_Detail {            public string City { get; set; }            public string City_Code { get; set; }            public string District { get; set; }            public string Province { get; set; }            public string Street { get; set; }            public string Street_Number { get; set; }        }        [Serializable]        public class Point {            public string X { get; set; }            public string Y { get; set; }        }    }

2、定位方法函数：

        public static baidu_location.AddressForQueryIPFromBaidu GetAddressFromIP()        {            string baiduKey = "";//值为自己申请的ak值，填进去即可            string url = "http://api.map.baidu.com/location/ip?ak=" + baiduKey + "&coor=bd09ll";            try            {                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);                HttpWebResponse response = (HttpWebResponse)request.GetResponse();                System.IO.Stream responseStream = response.GetResponseStream();                System.IO.StreamReader sr = new System.IO.StreamReader(responseStream, System.Text.Encoding.GetEncoding("utf-8"));                string responseText = sr.ReadToEnd();                sr.Close();                sr.Dispose();                responseStream.Close();                string jsonData = responseText;                                baidu_location.AddressForQueryIPFromBaidu addressForQueryIPFromBaidu = JsonConvert.DeserializeObject<baidu_location.AddressForQueryIPFromBaidu>(jsonData);                if(Convert.ToInt32(addressForQueryIPFromBaidu.Status)==0)                    return addressForQueryIPFromBaidu;                else                {                    //根据需求，参考官方文档可以添加更多判断项                    MessageBox.Show("定位失败");                    return null;                                    }            }            catch (Exception e) {                //MessageBox.Show("error occured when get location from ip:"+e.ToString());                MessageBox.Show("定位失败，出现异常");                return null;            }        }

3、ak申请方法：

1.百度地图API官方文档地址：

http://lbsyun.baidu.com/index.php?title=webapi/ip-api

2.在服务接口文档目录下有一个请求参数表格，ak参数含义选项下有API控制台可以点击，点击进去即可申请，里面介绍比较清楚，这里不再赘述。

3.如无特殊要求，选择服务端和ip白名单（0.0.0.0/0）即可

4.申请完之后将ak填到定位函数里

4、调用实例：

            baidu_location.AddressForQueryIPFromBaidu location_msg = Method.GetAddressFromIP();            if (location_msg == null)                msg_content.location = "";            else                msg_content.location = location_msg.Content.Address_Detail.Province + location_msg.Content.Address_Detail.City;

中间如有缺少类库引用可以自己添加或参考我之前的博客，也可留言。

本文代码或有不足，中间可根据自己需求进行代码更改。