Wechat public account simple development (10) link message

Don’t want to listen to my bullshit, directly look at the official: wechat official documents: mp.weixin.qq.com/wiki?t=reso…

Note before development: we need to use StreamReader

Using system.io;

If we find that our users send link information to the public account. We’re dealing with the link information.

First let’s take a look at the official documentation.

<xml><ToUserName>< ![CDATA[toUser] ]></ToUserName><FromUserName>< ![CDATA[fromUser] ]></FromUserName><CreateTime>1351776360</CreateTime><MsgType>< ![CDATA[link] ]></MsgType><Title><! [CDATA[link to official website of public platform]]></Title><Description><! [CDATA[link to official website of public platform]]></Description><Url>< ![CDATA[url] ]></Url><MsgId>1234567890123456</MsgId></xml>
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Now let’s talk about development

Here are some of the rules wechat gave us

We are now going to use these rules to get what we want.

Step 1: Get that string of XML. This is the most important, because without this XML, we have nothing. (Our source of information is this XML.)

Here I use StreamReader to get Request.Body

Because XML is mostly in Request.Body

// Declare an XML convenience call
string xml="";
// Get our stream
var reader = new StreamReader(Request.Body);
// Read the XML from the stream.
var contentFromBody = reader.ReadToEnd();
// Save it into our string for later use
xml = contentFromBody;
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We read the information in the XML and turn it into our wechat message object.

Here? I borrowed the code from a big guy:

Several classes that specialize in handling wechat messages

The first class: MessageFromWeiXin:

The second class:

ResponseClient:

I’m not going to show these two classes. You can go to a few articles to see, if you don’t want to turn over the article, please leave your email, or directly contact me

With these two classes, we have a lot of work to do. If you find any errors, it’s because of the string extension class. Leave the mailbox if you need it. This thing is too long. It is not good to send, but we should all understand, their own write a set.

Use the method in the second class above to convert: XmlToMessageFromWeiXin

We get our MSG object

We have msgType in this object, and the type enumeration is for each event.

We’ll write a switch to separate them. Different events are processed in different branches.

/// <summary>
///Receive messages from wechat
/// </summary>
[HttpPost]
[Route("api/WeChat")]
public string Post(string xml)
{
    System.Console.WriteLine("Enter message processing");
    var reader = new StreamReader(Request.Body);
    var contentFromBody = reader.ReadToEnd();
    System.Console.WriteLine($"xml:{contentFromBody}");
    xml = contentFromBody;

    try
    {
        var msg = ResponseClient.XmlToMessageFromWeiXin(xml);
        var Response = "";
        switch (msg.MsgType)
        {
            case MessageFromWeiXinType.link:
                var link = (LinkMessageFromWeiXin)msg;
                // Our link is mainly the message Title; Message Description; Message link Url
                System.Console.WriteLine($" Message title:{link.Title}\n Message description:{link.Description}\n Message link:{link.Url}\n");
                Response = "
       
       
        
       
       + link.FromUserName +
                               "]]> 
      
       
       + link.ToUserName +
                               "]]></FromUserName> <CreateTime>" +
                               ResponseClient.ConvertDateTimeToInt(DateTime.Now) +
                               " 
      
       
       
      
       
      , address:"+link.Url+"[]></Content> </ XML >"; break; } return Response; // return "success"; } catch (Exception ex) { return "error"; }}Copy the code

results

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