Introduction to basic concepts of WeChat public platform development

1: How to get started

1: If you don’t have a public account, you can apply for a test account first: http://mp.weixin.qq.com/debug/cgi-bin /sandbox?t=sandbox/login

2: After logging in, the interface looks like this:

3: Next, I need to prepare my own website. Then post your own URL. So, I wrote a WeixinTest.ashx using ASP.NET, the code is as follows:

public void ProcessRequest(HttpContext context) 
{       
    string echoStr = HttpContext.Current.Request.QueryString["echoStr"];       
    string signature = HttpContext.Current.Request.QueryString["signature"];       
    string timestamp = HttpContext.Current.Request.QueryString["timestamp"];       
    string nonce = HttpContext.Current.Request.QueryString["nonce"];

    if (!string.IsNullOrEmpty(echoStr))      
    {       
        HttpContext.Current.Response.Write(echoStr);       
        HttpContext.Current.Response.End();       
    }       
}

After publishing this website on our own server, we filled in the address and TOKEN (note that my test code does not This TOKEN has not been verified). Then click Submit in the picture above, and you will get this interface:

The appearance of the above interface means that the submission is successful.

4: What happened after you scanned the QR code just now with WeChat on your mobile phone?

The above mentioned the performance of this test public account on the management side, so if you pay attention to it, what changes have happened to your own WeChat. Yes, it shows up in your subscription. By the way, at first I thought that since this test account was not a service account, it would not be able to enjoy some advanced features. However, no, since it is a test account, it should make me happy when testing. So, let’s take a look at how to generate a menu. However, let’s first clarify our thinking and see what the data flow of WeChat public accounts is all about. If you don't figure this out, you'll be like me, scratching your head for the entire day.

2: About data flow

1: Register for a test account

Registering for a test account is done on the WeChat website. Enter the url and token, it indicates that we have created this official account.

2: How do others who follow your official account interact with you

When someone follows this official account, the first thing they visit is this one we create at the moment The url used, yes, the url is important. When registering, WeChat’s website will visit it to see if it is legal. After successful registration, this URL will become the only address for others to interact with you using WeChat on their mobile phones.

3: How do you push content to others

This is divided into two parts,

The first situation: by configuring information on the WeChat website or calling WeChat Interface, we let our official account bind some information: such as custom menus. In this way, when others follow the official account, they can see the customized menu and other information;

Second scenario: We understand the first scenario as the configuration phase, then the second scenario is the real development stage. At this stage, we receive the user's messages (text, click, view, etc.), and then push the user's messages to the user's text, image, website page (it can be the same website as your URL, or it can be a third party) website).

You can push this information to others: Custom menu

3: Example-How to generate a custom menu

This is the first situation mentioned above. Since it actually has little to do with real WeChat development, or you can write a piece of code independently to complete the calling interface and configure the information, then okay, I will use the program provided by WeChat:

Remember, the input must be in JSON format. To meet its format requirements, you can refer to WeChat’s developer profile.

Then we cancel the previous follow and follow the official account again, and you will be able to see the newly created menu (note that there is a delay. If you are not willing to wait, you can change to another WeChat ID to follow. came out). Since I can’t take pictures of myself on my phone, I won’t show the renderings here.

3.1 About access_token

Note that here, we also need to enter an access_token. We can also use this interface debugging tool to obtain this value:

It should be noted that this value has an expiration date.

Four: Example-a real url handler

public void ProcessRequest(HttpContext param_context)     
{      
    if (HttpContext.Current.Request.HttpMethod.ToUpper() == "POST")      
    {      
        using (Stream stream = HttpContext.Current.Request.InputStream)      
        {      
            Byte[] postBytes = new Byte[stream.Length];      
            stream.Read(postBytes, 0, (Int32)stream.Length);      
            Handle(Encoding.UTF8.GetString(postBytes));             
        }      
    }      
    else      
    {      
        Auth();  
    }      
}

Why do we need to judge whether it is POST? Because when applying for a public account, the WeChat website uses GET to verify the URL, so we can use the Auth method, and the interaction is done using POST. Next, we can start the real WeChat development:)~~

Reference:

1: Developer profile, http://mp.weixin.qq.com/wiki/index.php?title=%E5%BC%80%E5%8F%91%E8%80%85 %E8%A7%84%E8%8C%83

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