This article describes the use of basic interfaces in the development of WeChat public accounts, including the following:
(1) Obtain the permission token (AccessToken);
(2) Obtain the WeChat server address;
(3) Upload and download multimedia files;
(4) Create and display QR codes;
(5) Convert long links to short links.
Open source project address: http://git.oschina.net/xrwang2/xrwang.weixin.PublicAccount
Source code address of this article: http://git.oschina.net/xrwang2/xrwang.weixin.PublicAccount /blob/master/xrwang.net/Example/BasicInterface.aspx.cs
The demonstration address of this article: http://xrwang.net/Example/BasicInterface.aspx
The demonstration effect is as follows:

1 Obtain the permission token
The AccessToken class encapsulates the relevant properties and methods of the permission token.
(Note: OAuthAccessToken encapsulates the related methods of web page authorization token.)
The attributes are:
access_token——Token string
expires_in——Validity time (unit: seconds)
Static methods are:
Get——Get the permission token

/// <summary>
    /// 獲取許可令牌
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnGetAccessToken_Click(object sender,EventArgs e)
    {
        string userName = lbPublicAccount.SelectedValue;
        AccessToken token = AccessToken.Get(userName);
        txtAccessToken.Text = token != null ? token.access_token : "獲取許可令牌失敗。";
    }

2 Get the WeChat server address
The ServerAddresses class encapsulates the properties and methods for getting the server address.
Attributes are:
ip_list——server address array
Static methods are:
Get——get server address

/// <summary>
    /// 獲取微信服務器地址
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnGetServerAddress_Click(object sender, EventArgs e)
    {
        ErrorMessage errorMessage;
        ServerAddresses addresses = ServerAddresses.Get(out errorMessage);
        if (errorMessage.IsSuccess && addresses.ip_list != null)
        {
            StringBuilder sb = new StringBuilder();
            foreach (string ip in addresses.ip_list)
                sb.AppendFormat("{0},", ip);
            txtServerAddress.Text = sb.ToString();
        }
        else
            txtServerAddress.Text = string.Format("獲取微信服務器地址失敗。{0}", errorMessage);
    }

3 Upload and download multimedia files
MultiMediaHelper class encapsulation Methods related to multimedia files.
Static methods are:
Upload——Upload multimedia files
Download——Download multimedia files
GetDownloadUrl——Get the address of multimedia files
GetVideoMediaId——Get the video media ID in the message group

/// <summary>
    /// 上傳多媒體文件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        string userName = lbPublicAccount.SelectedValue;
        MultiMediaTypeEnum type = (MultiMediaTypeEnum)Enum.Parse(typeof(MultiMediaTypeEnum), lbMultiMediaType.SelectedValue);
        string filename = fileUpload.FileName;
        byte[] bytes = fileUpload.FileBytes;
        ErrorMessage errorMessage;
        MultiMediaUploadResult result = MultiMediaHelper.Upload(userName, type, filename, bytes, out errorMessage);
        if (errorMessage.IsSuccess && result != null)
            hlShowMultiMedia.NavigateUrl = MultiMediaHelper.GetDownloadUrl(AccessToken.Get(userName).access_token, result.MediaId);
        else
            hlShowMultiMedia.NavigateUrl = string.Format("javascript:alert(&#39;上傳多媒體文件失敗。\r\n{0}&#39;);", errorMessage);
    }

上傳多媒體文件，并生成下載鏈接的示例

4 Create and display QR code
The QrCode class encapsulates the properties and methods related to QR code.
Attributes are:
ticket——the ticket of the QR code
expire_seconds——the validity time of the QR code (unit: seconds)
url——the address after parsing the QR code image
Static methods are:
Create——Create QR code, different overload methods can create different types of QR codes
GetUrl——Get the address of the QR code image

/// <summary>
    /// 創(chuàng)建二維碼
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnCreateQrCode_Click(object sender, EventArgs e)
    {
        string userName = lbPublicAccount.SelectedValue;
        string strSceneId = txtSceneId.Text;
        QrCode qrcode=null;
        ErrorMessage errorMessage;
        if( cbIsTemple.Checked)
        {
            int expireSeconds = int.Parse(txtExpireSeconds.Text);
            int sceneId;
            if (int.TryParse(strSceneId, out sceneId))
                qrcode = QrCode.Create(userName, expireSeconds, sceneId, out errorMessage);
            else
                errorMessage = new ErrorMessage(ErrorMessage.ExceptionCode, "場景值id必須為整數(shù)。");
        }
        else
        {
            int sceneId;
            if (int.TryParse(strSceneId, out sceneId))
                qrcode = QrCode.Create(userName, sceneId, out errorMessage);
            else
                qrcode = QrCode.Create(userName, strSceneId, out errorMessage);
        }
        if (errorMessage.IsSuccess && qrcode != null)
            imgQrCode.ImageUrl = QrCode.GetUrl(qrcode.ticket);
        else
            imgQrCode.ImageUrl = "";
    }

5 Converting a long link to a short link

ShortUrl encapsulates the method of converting a long link to a short link.
Static methods are:
Get - Convert long links into short links

/// <summary>
    /// 獲取短鏈接
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnGetShortUrl_Click(object sender, EventArgs e)
    {
        string userName = lbPublicAccount.SelectedValue;
        ErrorMessage errorMessage;
        string shortUrl = ShortUrl.Get(userName, txtLongUrl.Text, out errorMessage);
        if (errorMessage.IsSuccess && string.IsNullOrWhiteSpace(shortUrl))
            txtShortUrl.Text = shortUrl;
        else
            txtShortUrl.Text = string.Format("獲取短鏈接失敗。{0}", errorMessage);
    }

Thank you for reading this article, I hope it is helpful to you.

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