逆地理编码：即逆地址解析，由百度经纬度信息得到结构化地址信息，例如：“lat:31.325152,lng:120.558957”逆地址解析的结果是“江苏省苏州市虎丘区塔园路318号”。
具体参数可查看官方文档。
示例：
注意事项：
（1）百度开发者key申请
（2）百度地图坐标系统与微信的坐标系统不同
（3）api调用地址及参数说明
（4）api回调函数意义
（5）理解json与jsonp的含义
3、微信JS-SDK核心代码
（1）JsAPI.cs生成相关JS-SDK配置参数
using System; using System.Globalization; using System.Linq; using System.Web.Security; using System.Web.UI; using WxPayAPI; namespace WxJsSDK { public class JsApi { /// <summary> /// 保存页面对象，因为要在类的方法中使用Page的Request对象 /// </summary> private Page page { get; set; } public WxJsData ResultJsData { get; set; } /// <summary> /// /// </summary> /// <param></param> public JsApi(Page page) { this.page = page; } public WxJsData GetJsData() { var data = new WxJsData(); data.SetValue("appid", WxPayConfig.APPID);//公众账号ID data.SetValue("timestamp", WxPayApi.GenerateTimeStamp()); data.SetValue("noncestr", WxPayApi.GenerateNonceStr());//随机字符串 var url = GetUrl(); data.SetValue("url", url); var jsToken = GetJsApiTicket(); data.SetValue("jsapi_ticket", jsToken); var signature = MakeSignature(jsToken, data.GetValue("noncestr").ToString(), data.GetValue("timestamp").ToString(), url); data.SetValue("signature", signature); ResultJsData = data; return data; } private string MakeSignature(string jsapiTicket, string noncestr, string timestamp, string url) { string[] arrayList = { "jsapi_ticket=" + jsapiTicket, "timestamp=" + timestamp, "noncestr=" + noncestr, "url=" + url }; Array.Sort(arrayList); var signature = string.Join("&", arrayList); signature = FormsAuthentication.HashPasswordForStoringInConfigFile(signature, "SHA1").ToLower(); return signature; } private string GetJsApiTicket() { var jsAuth = new JsAuthorizeAction(); var token = jsAuth.GetToken(); var nd = DateTime.Now - token.CreateDate; Log.Error(this.GetType().ToString(), token.access_token); Log.Error(this.GetType().ToString(), token.IsValid().ToString()); if (token.IsValid()) return jsAuth.GetJsApiTicket(token.access_token).ticket; return ""; } private string GetUrl() { string host = page.Request.Url.Host; string path = page.Request.Path; string queryString = page.Request.Url.Query; //这个地方要注意，参与签名的是网页授权获取用户信息时微信后台回传的完整url string url = "http://" + host + path + queryString; return url; } public string GetJsApiParameters() { Log.Debug(this.GetType().ToString(), "JsApi ::GetJsApiParam is processing..."); string parameters = ResultJsData.ToJson(); Log.Debug(this.GetType().ToString(), "Get JsApi : " + parameters); return parameters; } } }
（2）JsAuthorizeAction.cs微信JS-SDK相关API调用函数
using Payment.WxWebHlper; using Payment.WxWebHlper.Results; using System; using WxPayAPI; namespace WxJsSDK { public class JsAuthorizeAction { private static TokenResult Token = new TokenResult() { errcode = -1 }; private static JsApiTicketResult JsApiTicket = new JsApiTicketResult() { errcode = -1 }; public TokenResult GetToken() { Log.Error(this.GetType().ToString(), "GetToken"); if (!Token.IsValid()) { Token = GeTokenResult(); Log.Error(this.GetType().ToString(), Token.ToString()); } return Token; } /// <summary> /// /// </summary> /// <returns></returns> public TokenResult GeTokenResult() { var result = new TokenResult(); try { var webUtils = new WebUtils(); var url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", WxPayConfig.APPID, WxPayConfig.APPSECRET); var strRtn = webUtils.Get(url); result = Tools.JsonStringToObj<TokenResult>(strRtn); } catch (Exception ex) { Log.Error(this.GetType().ToString(), ex.Message); result = new TokenResult() { errcode = -1086 }; } return result; } /// <summary> /// /// </summary> /// <param></param> /// <returns></returns> public JsApiTicketResult GetJsApiTicket(string token) { Log.Error(this.GetType().ToString(), "GetJsApiTicket传入token：" + token); if (!JsApiTicket.IsValid()) { JsApiTicket = GetJsApiTicketResult(token); } return JsApiTicket; } /// <summary> /// /// </summary> /// <param></param> /// <returns></returns> public JsApiTicketResult GetJsApiTicketResult(string token) { JsApiTicketResult result; try { var webUtils = new WebUtils(); var url = string.Format("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token={0}&type=jsapi", token); var strRtn = webUtils.Get(url); result = Tools.JsonStringToObj<JsApiTicketResult>(strRtn); } catch (Exception ex) { Log.Error(this.GetType().ToString(), ex.Message); result = new JsApiTicketResult() { errcode = -1086 }; } return result; } } public class JsApiTicketResult : ReturnResult { /// <summary> /// 构造函数 /// </summary> public JsApiTicketResult() { CreateDate = DateTime.Now; } /// <summary> /// /// </summary> public string ticket { get; set; } /// <summary> /// access_token接口调用凭证超时时间，单位（秒） /// </summary> public int expires_in { get; set; } /// <summary> /// 创建时间 /// </summary> public DateTime CreateDate { get; set; } /// <summary> /// 判断是否有效 /// </summary> /// <returns></returns> public bool IsValid() { if (this.errcode != 0) return false; var nd = DateTime.Now - CreateDate; return nd.Seconds < 7200; } } public class TokenResult : ReturnResult { /// <summary> /// 构造函数 /// </summary> public TokenResult() { CreateDate = DateTime.Now; } /// <summary> /// 网页授权接口调用凭证,注意：此access_token与基础支持的access_token不同 /// </summary> public string access_token { get; set; } /// <summary> /// access_token接口调用凭证超时时间，单位（秒） /// </summary> public int expires_in { get; set; } /// <summary> /// 创建时间 /// </summary> public DateTime CreateDate { get; set; } /// <summary> /// 判断是否有效 /// </summary> /// <returns></returns> public bool IsValid() { if (this.errcode != 0) return false; var nd = DateTime.Now - CreateDate; return nd.Seconds < 7200; } } }
（3）WxJsData.cs微信JS-SDK参数类