C# develops WeChat portals and applications - using geographical location to expand related applications

This article continues the previous article "C# Development of WeChat Portal and Applications (12)-Using Speech Processing" and continues to introduce WeChat related applications. We know that geographical location information can be used for many related applications. In addition to knowing the user's location, we can also associate some geographical location applications, such as weather, popular movies, nearby attractions, nearby theaters, traffic events, etc. Etc. Anyway, for all information related to geographical location, we can make some extended applications as needed. This article mainly introduces how to use geographical location information to build operations that use these applications.

1. WeChat’s geographical location information

Before using it, let’s take a look at WeChat’s interface, which defines for us those information about geographical location. Information. In fact, the geographical location information is divided into two aspects on WeChat. One is to receive the user's geographical location request, and the other is the geographical location information that the user allows to report the geographical location operation and is sent regularly.

This article mainly introduces related applications based on the first type, how to process the user's geographical location after reporting it.

The geographical location reporting operation is to select the + sign to add the geographical location where you enter it, and then select the current or specified geographical location map. The specific operation is as follows.

                                       

##Geolocation Message

<xml><ToUserName><![CDATA[toUser]]></ToUserName><FromUserName><![CDATA[fromUser]]></FromUserName><CreateTime>1351776360</CreateTime><MsgType><![CDATA[location]]></MsgType><Location_X>23.134521</Location_X><Location_Y>113.358803</Location_Y><Scale>20</Scale><Label><![CDATA[位置信息]]></Label><MsgId>1234567890123456</MsgId></xml>

ParametersDescriptionToUserNameFromUserNameSender account (an OpenID) CreateTimeMessage creation time (integer) MsgTypelocationLocation_XLocation DimensionLocation_YGeographical location longitudeScaleMap zoom sizeLabelGeographical location informationMsgIdMessage id, 64-bit integer

有了上面的地理位置信息，我们在程序里面，需要在消息传递过来的时候，定义一个实体类信息，承载相关的地理位置信息，方便我们进一步的处理操作。

    /// <summary>
    /// 接收的地理位置消息    /// </summary>
    [System.Xml.Serialization.XmlRoot(ElementName = "xml")]    public class RequestLocation : BaseMessage
    {
        public RequestLocation()
        {            this.MsgType = RequestMsgType.Location.ToString().ToLower();
        }
        /// <summary>
        /// 消息ID        /// </summary>
        public Int64 MsgId { get; set; }        /// <summary>
        /// 地理位置维度        /// </summary>
        public decimal Location_X { get; set; }        /// <summary>
        /// 地理位置经度        /// </summary>
        public decimal Location_Y { get; set; }        /// <summary>
        /// 地图缩放大小        /// </summary>
        public int Scale { get; set; }        /// <summary>
        /// 地理位置信息        /// </summary>
        public string Label { get; set; }

    }

有了这些信息，我们在信息传递的时候，就能很好得到用户的相关数据了。

如果仅仅为了返回给用户，告诉用户目前的地理位置信息，可以用下面的操作就可以了。

        /// <summary>
        /// 对地理位置请求信息进行处理        /// </summary>
        /// <param name="info">地理位置请求信息实体</param>
        /// <returns></returns>
        public string HandleLocation(Entity.RequestLocation info)
        {            string xml = "";

            ResponseText txtinfo = new ResponseText(info);
            txtinfo.Content = string.Format("您发送的地理位置是：{0}", info.Label);
            xml = txtinfo.ToXml();            return xml;
        }

2、地址位置的应用处理

不过上面的信息，显然不符合我们扩展应用的要求，因此我们进一步进行完善里面对地理位置信息处理的操作。我们进一步把关于地理位置的操作，放到事件处理模块里面进行处理，处理代码如下所示。

        /// <summary>
        /// 对地理位置请求信息进行处理        /// </summary>
        /// <param name="info">地理位置请求信息实体</param>
        /// <returns></returns>
        public string HandleLocation(Entity.RequestLocation info)
        {            string xml = "";
            EventDispatch dispatch = new EventDispatch();
            xml = dispatch.DealLocation(info, info.Label, info.Location_Y, info.Location_X);            return xml;
        }

在处理的时候，我们需要先保存用户的地理位置信息，把它存储到用户的上下文记录里面。这样我们在处理指令的时候，把它获取到，然后传递给相关的方法就可以实现地理位置的扩展应用了。

            //保存经纬度
            string location = string.Format("{0},{1}", lat, lon);            bool result = BLLFactory<UserSet>.Instance.UpdateUserInput(info.FromUserName, location);

首先对用户地理位置的请求，我根据数据库配置给出了一个用户选择的指令提示，如下所示。

为了对地理位置请求的处理，我定义了一个用于处理这个操作的指令操作

这样整个地理位置的指令操作，就在应答链里面进行很好的跳转管理了。那么为了实现天气、放映影片、附近影院、旅游线路、交通事件等方面的扩展应用，我们应该如何操作呢？

3、地址位置应用扩展

我们知道，百度或者腾讯都提供了一些开放平台，给我们进行各种方式的使用。那么我们这里以使用百度LBS平台应用来构建一些模块。

 

 

这上面都有很多相关的接口供使用，我们可以根据其提供的数据格式进行封装，然后进行调用处理就可以了。

刚才说了，我配置了一些指令，用来构建相关的应用，指令的最后是一些事件代码的定义，我们对这些末端的事件代码进行处理，就可以给用户返回相关的信息了，总体的操作代码如下所示。

        /// <summary>
        /// 其他插件操作，如天气，景点、电影影讯、交通等        /// </summary>
        /// <param name="info">基础消息</param>
        /// <param name="eventKey">事件标识</param>
        /// <returns></returns>
        public string DealPlugin(BaseMessage info, string eventKey)
        {            //LogTextHelper.Info(eventKey);
            string userInput = BLLFactory<UserSet>.Instance.GetUserInput(info.FromUserName);            string xml = "";            switch (eventKey)
            {                case "event-void-wether":
                    xml = new WeatherPlugin().Response(info, userInput);                    break;                case "event-void-movie":
                    xml = new MoviePlugin().Response(info, userInput);                    break;                case "event-void-cinema":
                    xml = new CinemaPlugin().Response(info, userInput);                    break;                case "event-void-travel":
                    xml = new TravelPlugin().Response(info, userInput);                    break;                case "event-void-traffic":
                    xml = new TrafficEventPlugin().Response(info, userInput);                    break;                default:                    break;
            }            return xml;
        }

这里以天气为例，说明该如何调用百度的接口的，首先我们封装一下相关的接口调用。

        /// <summary>
        /// 根据参数调用百度接口，获取相关的结果数据        /// </summary>
        /// <param name="location">地理位置</param>
        /// <param name="ak">API调用键</param>
        /// <returns></returns>
        public BaiduWeatherResult Execute(string location, string ak)
        {
            location = HttpUtility.UrlEncode(location);            var url = string.Format("http://www.php.cn/{0}&output=json&ak={1}", location, ak);

            BaiduWeatherResult result = BaiduJsonHelper<BaiduWeatherResult>.ConvertJson(url);            return result;
        }

其中的BaiduWeatherResult 是我根据调用返回的Json结果，构建的一个实体类，用来存储返回的内容。具体代码如下所示。

    /// <summary>
    /// 天气请求结果Json对象    /// </summary>
    public class BaiduWeatherResult : BaiduResult
    {        /// <summary>
        /// 天气预报信息        /// </summary>
        public List<BaiduWeatherData> results = new List<BaiduWeatherData>();
    }    /// <summary>
    /// 城市的天气信息    /// </summary>
    public class BaiduWeatherData
    {        /// <summary>
        /// 当前城市        /// </summary>
        public string currentCity { get; set; }        /// <summary>
        /// 天气预报信息        /// </summary>
        public List<BaiduWeatherJson> weather_data = new List<BaiduWeatherJson>();
    }    /// <summary>
    /// 天气预报的单条记录Json信息    /// </summary>
    public class BaiduWeatherJson
    {        /// <summary>
        /// 天气预报时间        /// </summary>
        public string date { get; set; }        /// <summary>
        /// 白天的天气预报图片url        /// </summary>
        public string dayPictureUrl { get; set; }        /// <summary>
        /// 晚上的天气预报图片url        /// </summary>
        public string nightPictureUrl { get; set; }        /// <summary>
        /// 天气状况        /// </summary>
        public string weather { get; set; }        /// <summary>
        /// 风力        /// </summary>
        public string wind { get; set; }        /// <summary>
        /// 温度        /// </summary>
        public string temperature { get; set; }
    }

为了构建返回给客户的图文数据，我们需要构建一个News对象，然后生成XML数据返回给服务器进行处理即可。

        /// <summary>
        /// 响应用户请求，并返回相应的XML数据        /// </summary>
        /// <param name="info">微信基础信息</param>
        /// <param name="location">地理位置：经纬度坐标或者地名</param>
        /// <returns></returns>
        public string Response(BaseMessage info, string location)
        {            string xml = "";            //"广州" 或者 "116.305145,39.982368"
            if (!string.IsNullOrEmpty(location))
            {
                BaiduWeatherResult result = Execute(location, baiduAK);                if (result != null && result.results.Count > 0)
                {
                    BaiduWeatherData data = result.results[0];                    if (data != null)
                    {
                        ArticleEntity first = new ArticleEntity();
                        first.Title = string.Format("{0} 天气预报", data.currentCity);

                        ResponseNews news = new ResponseNews(info);
                        news.Articles.Add(first);                        int i = 0;                        foreach (BaiduWeatherJson json in data.weather_data)
                        {
                            ArticleEntity article = new ArticleEntity();
                            article.Title = string.Format("{0}\n{1} {2} {3}", json.date, json.weather, json.wind, json.temperature);                            if (i++ == 0)
                            {
                                article.PicUrl = IsDayTime() ? json.dayPictureUrl : json.nightPictureUrl;
                            }                            else
                            {
                                article.PicUrl = json.dayPictureUrl;
                            }
                            news.Articles.Add(article);
                        }

                        xml = news.ToXml();
                    }
                }
            }            return xml;
        }

这样就很好实现了整体的功能了，具体界面功能可以访问我的微信（广州爱奇迪）进行了解，下面是功能截图供参考。

   

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