Shulou(Shulou.com)06/03 Report--

This article is about how to use. Net to develop the geolocation function of Wechat public platform. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

There are two situations involving geographical location in the Wechat public platform:

First, I send an optional geographic location to Wechat, and then Wechat can automatically feedback the response information.

Second, let Wechat get our GPS location address and feedback the response information.

First of all, let's take a look at the first one. In Wechat, in addition to sending text, pictures, voice, and other information, there is also information about geographical location. According to the XML information that Wechat accepts geographic information, we need to modify the previous wxmessage class and add several attributes:

Class wxmessage {public string FromUserName {get; set;} public string ToUserName {get; set;} public string MsgType {get; set;} public string EventName {get; set;} public string Content {get; set;} public string Recognition {get; set;} public string MediaId {get; set;} public string EventKey {get; set;} public string Location_X {get; set;} public string Location_Y {get; set } public string Scale {get; set;} public string Label {get; set;}} where Location_X represents latitude, Location_Y represents longitude, Scale represents scaling, Label represents location description and accepted text, voice message sample, MsgType of geographic information is "location", modify the previous GetWxMessage () function and message processing in OnLoad: private wxmessage GetWxMessage () {wxmessage wx = new wxmessage () StreamReader str = new StreamReader (Request.InputStream, System.Text.Encoding.UTF8); XmlDocument xml = new XmlDocument (); xml.Load (str); wx.ToUserName = xml.SelectSingleNode ("xml"). SelectSingleNode ("ToUserName"). InnerText; wx.FromUserName = xml.SelectSingleNode ("xml"). SelectSingleNode ("FromUserName"). InnerText; wx.MsgType = xml.SelectSingleNode ("xml"). SelectSingleNode ("MsgType"). InnerText If (wx.MsgType.Trim () = = "text") {wx.Content = xml.SelectSingleNode ("xml"). SelectSingleNode ("Content"). InnerText;} if (wx.MsgType.Trim () = = "location") {wx.Location_X = xml.SelectSingleNode ("xml"). SelectSingleNode ("Location_X"). InnerText; wx.Location_Y = xml.SelectSingleNode ("xml"). SelectSingleNode ("Location_Y"). InnerText Wx.Scale = xml.SelectSingleNode ("xml"). SelectSingleNode ("Scale"). InnerText; wx.Label = xml.SelectSingleNode ("xml"). SelectSingleNode ("Label"). InnerText;} if (wx.MsgType.Trim () = = "event") {wx.EventName = xml.SelectSingleNode ("xml"). SelectSingleNode ("Event"). InnerText; wx.EventKey = xml.SelectSingleNode ("xml"). SelectSingleNode ("EventKey"). InnerText } if (wx.MsgType.Trim () = = "voice") {wx.Recognition = xml.SelectSingleNode ("xml"). SelectSingleNode ("Recognition"). InnerText;} return wx;} protected void Page_Load (object sender, EventArgs e) {wxmessage wx = GetWxMessage (); string res = "" If (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.Trim () = = "subscribe") {string content = "; if (! wx.EventKey.Contains (" qrscene_ ")) {content =" /: rose Welcome Beijing Yongjie Youxin Technology Co., Ltd. /: rose\ nreply directly to "Hello"; res = sendTextMessage (wx, content) } else {content = "QR code parameters:\ n" + wx.EventKey.Replace ("qrscene_", ""); res = sendTextMessage (wx, content);}} else if (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.ToLower () = = "scan") {string str = "QR code parameters:\ n" + wx.EventKey Res = sendTextMessage (wx, str);} else if (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.Trim () = = "CLICK") {if (wx.EventKey== "HELLO") res = sendTextMessage (wx, "Hello, welcome to the public Wechat platform of Beijing Yongjie Youxin Technology Co., Ltd.");} else {WriteLog (wx.MsgType) If (wx.MsgType = = "text" & & wx.Content = = "Hello") {res = sendTextMessage (wx, "Hello, welcome to the public Wechat platform of Beijing Yongjie Youxin Technology Co., Ltd.");} else if (wx.MsgType = = "voice") {res = sendTextMessage (wx, wx.Recognition) } else if (wx.MsgType = = "location") {res = sendTextMessage (wx, "the location you sent is:" + wx.Label + "; latitude:" + wx.Location_X + "; longitude:" + wx.Location_Y + "; scaling:" + wx.Scale);} else {res = sendTextMessage (wx, "Hello, message unrecognized!") } Response.Write (res);}

In this way, when we send a geographic location information, we can feedback the response information. It is worth mentioning that: the location of geographic information here does not need authorization, because the location of the geographic information we send is not necessarily our real location, we can make any choice in the input interface without involving privacy.

Of course, if we want to make a function similar to "near me", there must be two conditions: turn on the function of obtaining user's geographic information in the Wechat public account. Second, users themselves allow the Wechat public account to get my location when they follow Wechat. This requires the use of the second situation we introduced to you at the beginning of the article. According to Wechat, when a conversation begins (that is, when you enter the dialogue interface), you first get it, and then automatically get it every five seconds. In other words, when you get the user's location information, it triggers not a "one-word conversation", but a special event that starts every five seconds. Here MsgType is defined as "event", and in order to distinguish it from other "event", his EventName (officially called event) is "LOCATION" (uppercase).

Now I still need to modify our wxmessage class in Wechat format:

Class wxmessage {public string FromUserName {get; set;} public string ToUserName {get; set;} public string MsgType {get; set;} public string EventName {get; set;} public string Content {get; set;} public string Recognition {get; set;} public string MediaId {get; set;} public string EventKey {get; set;} public string Location_X {get; set;} public string Location_Y {get; set } public string Scale {get; set;} public string Label {get; set;} public string Latitude {get; set;} public string Longitude {get; set;} public string Precision {get; set;}} modify the GetWxMessage () function and OnLoad function: private wxmessage GetWxMessage () {wxmessage wx = new wxmessage (); StreamReader str = new StreamReader (Request.InputStream, System.Text.Encoding.UTF8); XmlDocument xml = new XmlDocument () Xml.Load (str); wx.ToUserName = xml.SelectSingleNode ("xml"). SelectSingleNode ("ToUserName"). InnerText; wx.FromUserName = xml.SelectSingleNode ("xml"). SelectSingleNode ("FromUserName"). InnerText; wx.MsgType = xml.SelectSingleNode ("xml"). SelectSingleNode ("MsgType"). InnerText; WriteLog ("MsgType:" + wx.MsgType) If (wx.MsgType.Trim () = = "event") {wx.EventName = xml.SelectSingleNode ("xml"). SelectSingleNode ("Event"). InnerText; WriteLog (wx.EventName); if (wx.EventName.ToUpper () = = "LOCATION") {wx.Latitude = xml.SelectSingleNode ("xml"). SelectSingleNode ("Latitude"). InnerText; wx.Longitude = xml.SelectSingleNode ("xml"). SelectSingleNode ("Longitude"). InnerText Wx.Precision = xml.SelectSingleNode ("xml"). SelectSingleNode ("Precision"). InnerText;} else {wx.EventKey = xml.SelectSingleNode ("xml"). SelectSingleNode ("EventKey"). InnerText;} if (wx.MsgType.Trim () = = "text") {wx.Content = xml.SelectSingleNode ("xml"). SelectSingleNode ("Content"). InnerText } if (wx.MsgType.Trim () = = "location") {wx.Location_X = xml.SelectSingleNode ("xml"). SelectSingleNode ("Location_X"). InnerText; wx.Location_Y = xml.SelectSingleNode ("xml"). SelectSingleNode ("Location_Y"). InnerText; wx.Scale = xml.SelectSingleNode ("xml"). SelectSingleNode ("Scale"). InnerText; wx.Label = xml.SelectSingleNode ("xml"). SelectSingleNode ("Label"). InnerText } if (wx.MsgType.Trim () = = "voice") {wx.Recognition = xml.SelectSingleNode ("xml") .SelectSingleNode ("Recognition") .InnerText;} return wx;}

When MsgType is event, we used menu events before, now we need to add the code snippet whose EventName is "LOCATION", because there are no other event involved yet. I'll use else later, and I'll make the code more standardized later. Assign values to the three new attributes here, and then modify the Onload function

Protected void Page_Load (object sender, EventArgs e) {wxmessage wx = GetWxMessage (); string res = ""; if (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.Trim () = = "subscribe") {string content = "" If (! wx.EventKey.Contains ("qrscene_")) {content = "/: rose Welcome Beijing Yongjie Youxin Technology Co., Ltd. /: rose\ nreply directly to" Hello "; res = sendTextMessage (wx, content);} else {content =" QR Code parameters:\ n "+ wx.EventKey.Replace (" qrscene_ ",") Res = sendTextMessage (wx, content);}} else if (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.ToLower () = = "scan") {string str = "QR Code parameters:\ n" + wx.EventKey; res = sendTextMessage (wx, str) } else if (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.Trim () = = "CLICK") {if (wx.EventKey== "HELLO") res = sendTextMessage (wx, "Hello, welcome to the public Wechat platform of Beijing Yongjie Youxin Technology Co., Ltd.") } else if (! string.IsNullOrEmpty (wx.EventName) & & wx.EventName.Trim () = = "LOCATION") {res = sendTextMessage (wx, "your location is longitude:" + wx.Latitude + ", dimension is:" + wx.Longitude+ ", geographic longitude is:" + wx.Precision) } else {if (wx.MsgType = = "text" & & wx.Content = = "Hello") {res = sendTextMessage (wx, "Hello, welcome to the public Wechat platform of Beijing Yongjie Youxin Technology Co., Ltd.");} else if (wx.MsgType = = "voice") {res = sendTextMessage (wx, wx.Recognition) } else if (wx.MsgType = = "location") {res = sendTextMessage (wx, "the location you sent is:" + wx.Label + "; latitude:" + wx.Location_X + "; longitude:" + wx.Location_Y + "; scaling:" + wx.Scale);} else {res = sendTextMessage (wx, "Hello, message unrecognized!") } Response.Write (res);}

All right, done, so that when you open your Wechat to "get user location information", the Wechat platform will remind you whether to enter the session for the first time or every 5 seconds, if you choose the latter, you will see that you will be fed back with a geographic location information every 5 seconds.

What needs to be paid attention to here is: I think there is no problem in this way, but I can't get the information, because when I enter the conversation, you will see your phone GPS searching, and you won't see the content until the GPS is located. It can be understood that the event of obtaining the user's location information will only be triggered after you GPS the location. This is not what I imagined that the approximate location can also be obtained through the base station location. This requires the developer's attention. I just worked on it for a long time, and when I went out, the phone located and inadvertently saw the reply, which suddenly realized.

Speaking of which, you may ask, what is the use of knowing only latitude and longitude coordinates? It's not exactly where. In fact, we can use a variety of methods to know the location details. For example, we can use the reverse resolution of the address of BaiduMap API to guide the coordinates in that city, that street, etc., and even know the situation nearby. I will not say any more here. I will have the opportunity to talk about BaiduMap with you in the future.

Thank you for reading! This is the end of the article on "how to use .NET to develop the geographic location function of Wechat public platform". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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