C#实现微信结合百度api获取当前用户地理位置的方法

本文实例讲述了C#实现微信结合百度api获取当前用户地理位置的方法。分享给大家供大家参考，具体如下：

操作步骤：

1. 先根据微信提供的接口文档获取到经纬度

参考文档地址：http://mp.weixin.qq.com/wiki/8/1b86529d05db9f960e48c3c7ca5be288.html

2. 由于直接使用微信获取到的经纬度，来使用百度地图api获取地址存在500~1000米的偏差，有时候定位不是很准确，所以需要转换成百度的坐标

参考文档地址：http://developer.baidu.com/map/index.php?title=webapi/guide/changeposition

3. 根据百度api实现逆地址解析，获取当前位置

参考文档地址：http://developer.baidu.com/map/index.php?title=webapi/guide/webservice-geocoding

具体实例：

该例子是mvc项目

1. WX_Location.cshtml页面：

@using System.Web.Optimization;
@{
 Layout = "~/Views/Shared/Master/_App.cshtml";
}
@section Head{
}

 
  微信定位页面
 
 
  
 

@section scripts{
  @*微信js-sdk*@
 
 
}

2.

/// 

/// 微信定位
/// 
/// 
public ActionResult WX_Location()
{
   #region 获取定位所需要的参数
   //jssdk JS接口安全域名填写，
   //access_token来获取jsapi_ticket
   string ticket = GetTicket();
   var timeStamp = TenpayUtil.getTimestamp();
   var nonceStr = TenpayUtil.getNoncestr();
   //设置参数
   RequestHandler paySignReqHandler = new RequestHandler(System.Web.HttpContext.Current);
   //参数顺序。
   paySignReqHandler.setParameter("jsapi_ticket", ticket);
   paySignReqHandler.setParameter("noncestr", nonceStr);
   paySignReqHandler.setParameter("timestamp", timeStamp);
   paySignReqHandler.setParameter("url", Request.Url.AbsoluteUri);//Url#号后不要
   // LogHelper.WriteInfoLog("noncestr:" + nonceStr + "。jsapi_ticked:" + ticket + "。timestamp:" + timeStamp + "。url:"+Request.Url.AbsoluteUri + "。");
   ViewData["signature"] = paySignReqHandler.createSHA1Sign();
   //LogHelper.WriteInfoLog("signature:" + paySignReqHandler.createSHA1Sign());
   ViewData["timestamp"] = timeStamp;
   ViewData["nonceStr"] = nonceStr;
   #endregion
   return View();
}

3. 获取地理位置方法

#region 获取地理位置
public ActionResult GetLocation(string lat, string lon)
{
   //23.1294。113.3761
   LogHelper.WriteInfoLog(lat + "。" + lon);
   string x = string.Empty, y = string.Empty, strReturn = string.Empty;
   #region 先把微信经纬度（23.12536。113.36684 ）转换成百度坐标
   string apiurl = "http://api.map.baidu.com/geoconv/v1/?coords=" + lon + "," + lat + "&from=1&to=5&ak=你的百度地图api密钥";
   WebRequest request = WebRequest.Create(@apiurl);
   request.Method = "POST";
   WebResponse response = request.GetResponse();
   Stream stream = response.GetResponseStream();
   Encoding encode = Encoding.UTF8;
   StreamReader reader = new StreamReader(stream, encode);
   string detail = reader.ReadToEnd();
   var jd = JsonConvert.DeserializeObject(detail);
   List result = jd.result;
   foreach (var item in result)
   {
    x = item.x;
    y = item.y;
   }
   #endregion
   #region 通过得到的百度坐标进行逆地址解析获取到真实的地理位置
   apiurl = "http://api.map.baidu.com/geocoder/v2/?ak=8aoCgAGfz0r4MantipNitjI0&callback=renderReverse&location=" + y + "," + x + "&output=json&pois=1";
   #region 通过传入的参数得到url请求
   request = WebRequest.Create(@apiurl);
   request.Method = "POST";
   response = request.GetResponse();
   stream = response.GetResponseStream();
   encode = Encoding.UTF8;
   reader = new StreamReader(stream, encode);
   detail = reader.ReadToEnd();
   //@"(?is)(?<=)(.∗)(?=)";//(?is)
   // string results = System.Text.Regularexpressions.Regex.Replace(detail, @"(?is)(?<=)(.∗)(?=)", "$2");
   string results = Regex.Match(detail, @"(?is)(?<=)(.∗)(?=)").Result("$1");
   JsonData jsondta = JsonMapper.ToObject(results);
   JsonData jdItems = jsondta["result"];
   //获取结构化地址信息
   strReturn = (String)jdItems["formatted_address"];
   LogHelper.WriteInfoLog(strReturn);
   #endregion
   #endregion
   return Content(strReturn);
}
#endregion

涉及到的相关方法以及类：

1. 获取ticket

#region w微信JS-SDK权限签名
public string GetTicket()
{
   #region 通过 appid + appsecert 获取公众号的 access_token（不是用户的 access_token）
   string apiurl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + TenpayUtil.appid + "&secret=" + TenpayUtil.appsecret;
   #region 通过传入的参数得到url请求
   WebRequest request = WebRequest.Create(@apiurl);
   request.Method = "POST";
   WebResponse response = request.GetResponse();
   Stream stream = response.GetResponseStream();
   Encoding encode = Encoding.UTF8;
   StreamReader reader = new StreamReader(stream, encode);
   string detail = reader.ReadToEnd();
   var jd = JsonConvert.DeserializeObject(detail);
   String access_token = (String)jd.access_token;
   Session["access_token"] = access_token;
   #endregion
   #endregion
   #region 获取ticket
   apiurl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + access_token + "&type=jsapi";
   request = WebRequest.Create(@apiurl);
   response = request.GetResponse();
   stream = response.GetResponseStream();
   encode = Encoding.UTF8;
   reader = new StreamReader(stream, encode);
   detail = reader.ReadToEnd();
   jd = JsonConvert.DeserializeObject(detail);
   String ticket = jd.ticket;
   Session["ticket"] = ticket;
   #endregion
   return ticket;
}
#endregion

2. TenpayUtil类

/// 

/// TenpayUtil 的摘要说明。
/// 配置文件
/// 
public class TenpayUtil
{
    public static string tenpay = "1";
    //财付通商户号
    public static string partner = "";/
    //财付通密钥
    public static string key = "";
    //微信appsecret
    public static string appsecret = "";
    //微信appid
    public static string appid = "";
    //paysignkey(非appkey)
    public static string appkey = "";
    //支付完成后的回调处理页面,*替换成notify_url.asp所在路径
    public static string tenpay_notify = "";
    public TenpayUtil()
    {
    }
    public static string getNoncestr()
    {
      Random random = new Random();
      return MD5Util.GetMD5(random.Next(1000).ToString(), "GBK");
    }
    public static string getTimestamp()
    {
      TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
      return Convert.ToInt64(ts.TotalSeconds).ToString();
    }
    
    public static string UrlEncode(string instr, string charset)
    {
      //return instr;
      if (instr == null || instr.Trim() == "")
 return "";
      else
      {
 string res;
 try
 {
   res = HttpUtility.UrlEncode(instr, Encoding.GetEncoding(charset));
 }
 catch (Exception ex)
 {
   res = HttpUtility.UrlEncode(instr, Encoding.GetEncoding("GB2312"));
 }
 return res;
      }
    }
    
    public static string UrlDecode(string instr, string charset)
    {
      if (instr == null || instr.Trim() == "")
 return "";
      else
      {
 string res;
 try
 {
   res = HttpUtility.UrlDecode(instr, Encoding.GetEncoding(charset));
 }
 catch (Exception ex)
 {
   res = HttpUtility.UrlDecode(instr, Encoding.GetEncoding("GB2312"));
 }
 return res;
      }
    }
    
    public static UInt32 UnixStamp()
    {
      TimeSpan ts = DateTime.Now - TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
      return Convert.ToUInt32(ts.TotalSeconds);
    }
    
    public static string BuildRandomStr(int length)
    {
      Random rand = new Random();
      int num = rand.Next();
      string str = num.ToString();
      if (str.Length > length)
      {
 str = str.Substring(0, length);
      }
      else if (str.Length < length)
      {
 int n = length - str.Length;
 while (n > 0)
 {
   str.Insert(0, "0");
   n--;
 }
      }
      return str;
    }
}

3. RequestHandler类

public class RequestHandler
{
    public RequestHandler(HttpContext httpContext)
    {
      parameters = new Hashtable();
      this.httpContext = httpContext;
    }
    
    private string key;
    protected HttpContext httpContext;
    
    protected Hashtable parameters;
    
    private string debugInfo;
    
    public virtual void init()
    {
    }
    
    public String getDebugInfo()
    {
      return debugInfo;
    }
    
    public String getKey()
    {
      return key;
    }
    
    public void setKey(string key)
    {
      this.key = key;
    }
    
    public void setParameter(string parameter, string parameterValue)
    {
      if (parameter != null && parameter != "")
      {
 if (parameters.Contains(parameter))
 {
   parameters.Remove(parameter);
 }
 parameters.Add(parameter, parameterValue);
      }
    }
    //获取package带参数的签名包
    public string getRequestURL()
    {
      this.createSign();
      StringBuilder sb = new StringBuilder();
      ArrayList akeys = new ArrayList(parameters.Keys);
      akeys.Sort();
      foreach (string k in akeys)
      {
 string v = (string)parameters[k];
 if (null != v && "key".CompareTo(k) != 0)
 {
   sb.Append(k + "=" + TenpayUtil.UrlEncode(v, getCharset()) + "&");
 }
      }
      //去掉最后一个&
      if (sb.Length > 0)
      {
 sb.Remove(sb.Length - 1, 1);
      }
      return sb.ToString();
    }
    //创建md5摘要,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
    protected virtual void createSign()
    {
      StringBuilder sb = new StringBuilder();
      ArrayList akeys = new ArrayList(parameters.Keys);
      akeys.Sort();
      foreach (string k in akeys)
      {
 string v = (string)parameters[k];
 if (null != v && "".CompareTo(v) != 0
   && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
 {
   sb.Append(k + "=" + v + "&");
 }
      }
      sb.Append("key=" + this.getKey());
      string sign = MD5Util.GetMD5(sb.ToString(), getCharset()).ToUpper();
      this.setParameter("sign", sign);
      //debug信息
      this.setDebugInfo(sb.ToString() + " => sign:" + sign);
    }
    //创建package签名
    public virtual string CreateMd5Sign(string key, string value)
    {
      StringBuilder sb = new StringBuilder();
      ArrayList akeys = new ArrayList(parameters.Keys);
      akeys.Sort();
      foreach (string k in akeys)
      {
 string v = (string)parameters[k];
 if (null != v && "".CompareTo(v) != 0
   && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
 {
   sb.Append(k + "=" + v + "&");
 }
      }
      sb.Append(key + "=" + value);
      string sign = MD5Util.GetMD5(sb.ToString(), getCharset()).ToUpper();
      return sign;
    }
    //创建sha1签名
    public string createSHA1Sign()
    {
      StringBuilder sb = new StringBuilder();
      ArrayList akeys = new ArrayList(parameters.Keys);
      akeys.Sort();
      foreach (string k in akeys)
      {
 string v = (string)parameters[k];
 if (null != v && "".CompareTo(v) != 0
     && "sign".CompareTo(k) != 0 && "key".CompareTo(k) != 0)
 {
   if (sb.Length == 0)
   {
     sb.Append(k + "=" + v);
   }
   else
   {
     sb.Append("&" + k + "=" + v);
   }
 }
      }
      string paySign = SHA1Util.getSha1(sb.ToString()).ToString().ToLower();
      //debug信息
      this.setDebugInfo(sb.ToString() + " => sign:" + paySign);
      return paySign;
    }
    public string GetBizSign()
    {
      Dictionary bizParameters = new Dictionary();
      ArrayList akeys = new ArrayList(parameters.Keys);
      akeys.Sort();
      foreach (string k in akeys)
      {
 string v = (string)parameters[k];
 if (!string.IsNullOrEmpty(k))
 {
   bizParameters.Add(k.ToLower(), v);
 }
      }
      if (!bizParameters.Any(p => p.Key.ToLower() == "appkey"))
 bizParameters.Add("appkey", TenpayUtil.appkey);
      string bizString = FormatBizQueryParaMap(bizParameters, false);
      return SHA1Util.Sha1(bizString);
    }
    public string FormatBizQueryParaMap(Dictionary paraMap, bool urlencode)
    {
      string buff = "";
      try
      {
 var result = from pair in paraMap orderby pair.Key select pair;
 foreach (KeyValuePair pair in result)
 {
   if (pair.Key != "")
   {
     string key = pair.Key;
     string val = pair.Value;
     if (urlencode)
     {
val = System.Web.HttpUtility.UrlEncode(val);
     }
     buff += key.ToLower() + "=" + val + "&";
   }
 }
 if (buff.Length == 0 == false)
 {
   buff = buff.Substring(0, (buff.Length - 1) - (0));
 }
      }
      catch (Exception e)
      {
 throw e;
 //throw new SDKRuntimeException(e.Message);
      }
      return buff;
    }
    //输出XML
    public string parseXML()
    {
      StringBuilder sb = new StringBuilder();
      sb.Append("");
      int iIsNumber = 0;
      foreach (string k in parameters.Keys)
      {
 string v = (string)parameters[k];
 if (int.TryParse(v, out iIsNumber))
 {
   sb.Append("<" + k + ">" + v + "");
 }
 else
 {
   sb.Append("<" + k + ">");
 }
      }
      sb.Append("");
      return sb.ToString();
    }
    
    public void setDebugInfo(String debugInfo)
    {
      this.debugInfo = debugInfo;
    }
    public Hashtable getAllParameters()
    {
      return this.parameters;
    }
    protected virtual string getCharset()
    {
      return this.httpContext.Request.ContentEncoding.BodyName;
    }
}

4. 实体

#region 微信sdk
public partial class WX_JSSDK
{
  public string access_token { get; set; }
  public string ticket { get; set; }
}
#endregion
#region 百度坐标转换
public partial class BaiDuCoordinates
{
  public string status { get; set; }
  public List result { get; set; }
}
public partial class bc_result
{
  public string x { get; set; }
  public string y { get; set; }
}
#endregion

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