个人认为百度地图开放平台确实很好用但就是C#的SN校验会出现以下几个问题
一、官方的示例代码说的不清不楚
获取SN函数的Uri应该使用不带域名的Uri
比如：最终请求地址为https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321时
AKSNCaculater.CaculateAKSN中的uri参数应该使用https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321，而不可以是https://aspi.map.baidu.com/location/ip?coor=gcj02&ip=119.126.10.15&ak=123456&sn=654321
获取SN的时候参数的顺序是怎么样的，发送请求的时候参数的顺序就必须是怎么样
比如：获取SN的时候参数顺序是ip=119.126.10.15&coor=gcj02&ak=123456，那么最终请求地址就应该是https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&ak=123456&sn=654321，而不可以是https://aspi.map.baidu.com/location/ip?coor=gcj02&ip=119.126.10.15&ak=123456&sn=654321
无论如何SN必须在最终请求地址的最后！
比如以上情况下：https://api.map.baidu.com/location/ip?ip=119.126.10.15&coor=gcj02&sn=654321&ak=123456就是一个错误的地址
二、官方MD5加密是错的！
这一个真是把我害惨了，折腾了半天终于发现正确代码（我也是copy别人的，但不管怎么说，官方的MD5加密代码确实是错的）
正确的加密过程如下
public static string MD52(string password)
{
try
{
System.Security.Cryptography.HashAlgorithm hash = System.Security.Cryptography.MD5.Create();
byte[] hash_out = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password));
var md5_str = BitConverter.ToString(hash_out).Replace("-", "");
return md5_str.ToLower();
}
catch
{
throw;
}
}
完整类如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace SATPlatform
{
public class AKSNCaculater
{
public static string MD52(string password)
{
try
{
System.Security.Cryptography.HashAlgorithm hash = System.Security.Cryptography.MD5.Create();
byte[] hash_out = hash.ComputeHash(System.Text.Encoding.UTF8.GetBytes(password));
var md5_str = BitConverter.ToString(hash_out).Replace("-", "");
return md5_str.ToLower();
}
catch
{
throw;
}
}
public static string MD5(string password)
{
byte[] textBytes = System.Text.Encoding.UTF8.GetBytes(password);
try
{
System.Security.Cryptography.MD5CryptoServiceProvider cryptHandler;
cryptHandler = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] hash = cryptHandler.ComputeHash(textBytes);
string ret = "";
foreach (byte a in hash)
{
ret += a.ToString("x");
}
return ret;
}
catch
{
throw;
}
}
public static string UrlEncode(string str)
{
str = System.Web.HttpUtility.UrlEncode(str);
byte[] buf = Encoding.ASCII.GetBytes(str);//等同于Encoding.ASCII.GetBytes(str)
for (int i = 0; i < buf.Length; i++)
if (buf[i] == '%')
{
if (buf[i + 1] >= 'a') buf[i + 1] -= 32;
if (buf[i + 2] >= 'a') buf[i + 2] -= 32;
i += 2;
}
return Encoding.ASCII.GetString(buf);//同上，等同于Encoding.ASCII.GetString(buf)
}
public static string HttpBuildQuery(IDictionary<string, string> querystring_arrays)
{
StringBuilder sb = new StringBuilder();
foreach (var item in querystring_arrays)
{
sb.Append(UrlEncode(item.Key));
sb.Append("=");
sb.Append(UrlEncode(item.Value));
sb.Append("&");
}
sb.Remove(sb.Length - 1, 1);
return sb.ToString();
}
public static string CaculateAKSN(string ak, string sk, string url, IDictionary<string, string> querystring_arrays)
{
var queryString = HttpBuildQuery(querystring_arrays);
var str = UrlEncode(url + "?" + queryString + sk);
return MD52(str);
}
}
}
以上就是我被坑的经历，希望对其他人有用~~~
最后再附带上我的请求代码
/// <summary>
/// 返回指定IP的位置对应的百度城市代码（利用百度地图API
/// </summary>
/// <param name="IP">需要查询的IP地址</param>
/// <returns></returns>
public string GetPlace(string IP)
{
DataTable BasicIn = Reader("SELECT Th_MapAK , Th_MapSK FROM S_Inf");
Dictionary<string, string> P = new Dictionary<string, string>()
{
{"ip",IP },
{"coor","gcj02" },
{"ak",BasicIn.Rows[0]["Th_MapAK"].ToString() }
//{"address","百度大厦" },
//{"output","json" },
//{"ak","yourak" }
};
string GetSN = AKSNCaculater.CaculateAKSN(BasicIn.Rows[0]["Th_MapAK"].ToString(), BasicIn.Rows[0]["Th_MapSK"].ToString(), "/location/ip", P);
//string GetSN = AKSNCaculater.CaculateAKSN("yourak", "yoursk", "/geocoder/v2/", P);
HttpWebRequest NewRequest = (HttpWebRequest)WebRequest.Create("https://api.map.baidu.com/location/ip?" + AKSNCaculater.HttpBuildQuery(P) + "&sn=" + GetSN);
NewRequest.Headers.Add("charset", "utf-8");
NewRequest.Method = "GET";
NewRequest.ContentType = "application/json";
NewRequest.UserAgent = "Windows KeHuDuan";
NewRequest.Timeout = 5000;//设置超时时间
HttpWebResponse Response = (HttpWebResponse)NewRequest.GetResponse();
Stream ResponseStream = Response.GetResponseStream();
StreamReader ResponseStreamReader = new StreamReader(ResponseStream);
string Res = ResponseStreamReader.ReadToEnd();
ResponseStreamReader.Close();
ResponseStream.Close();
JObject ResJ = new JObject();
try
{ ResJ = JObject.Parse(Res); }
catch (Exception)
{ GiveErr(ErrCode.ThirdPartyError); }
if (ResJ["status"].ToString() != "0")
GiveErr(ErrCode.ThirdPartyError);
return ResJ["content"]["address_detail"]["city_code"].ToString();
}