用c#开发微信(3)基于Senparc.Weixin框架的接收普通消息处理 (源码下载)

本文讲述使用Senparc.Weixin框架来快速处理各种接收的普通消息。这里的消息指的是传统的微信公众平台消息交互,微信用户向公众号发送消息后,公众号回复消息给微信用户。包括以下7种类型:

1 文本消息
2 图片消息
3 语音消息
4 视频消息
5 小视频消息
6 地理位置消息
7 链接消息

实现非常简单,自定义一个继承MessageHandler的类,重写这7种类型的方法即可。注意:DefaultResponseMessage必须重写,用于返回没有处理过的消息类型(也可以用于默认消息,如帮助信息等);其中所有原OnXX的抽象方法已经都改为虚方法,可以不必每个都重写。若不重写,默认返回DefaultResponseMessage方法中的结果。

 

下面详细介绍实现步骤:

1. 添加index页面

private readonly string Token = ConfigurationManager.AppSettings["token"];//与微信公众账号后台的Token设置保持一致,区分大小写。
       protected void Page_Load(object sender, EventArgs e)
       {
           string signature = Request["signature"];
           string timestamp = Request["timestamp"];
           string nonce = Request["nonce"];
           string echostr = Request["echostr"];
           if (Request.HttpMethod == "GET")
           {
               //get method - 仅在微信后台填写URL验证时触发
               if (CheckSignature.Check(signature, timestamp, nonce, Token))
               {
                   WriteContent(echostr); //返回随机字符串则表示验证通过
               }
               else
               {
                   WriteContent("failed:" + signature + "," + CheckSignature.GetSignature(timestamp, nonce, Token) + "。" +
                               "如果你在浏览器中看到这句话,说明此地址可以被作为微信公众账号后台的Url,请注意保持Token一致。");
               }
               Response.End();
           }
           else
           {
               //post method - 当有用户想公众账号发送消息时触发
               if (!CheckSignature.Check(signature, timestamp, nonce, Token))
               {
                   WriteContent("参数错误!");
                   return;
               }
               //设置每个人上下文消息储存的最大数量,防止内存占用过多,如果该参数小于等于0,则不限制
               var maxRecordCount = 10;
               //自定义MessageHandler,对微信请求的详细判断操作都在这里面。
               var messageHandler = new CustomMessageHandler(Request.InputStream, maxRecordCount);
 
               try
               {
                   //测试时可开启此记录,帮助跟踪数据,使用前请确保App_Data文件夹存在,且有读写权限。
                   messageHandler.RequestDocument.Save(
                       Server.MapPath("~/App_Data/" + DateTime.Now.Ticks + "_Request_" +
                                      messageHandler.RequestMessage.FromUserName + ".txt"));
                   //执行微信处理过程
                   messageHandler.Execute();
                   //测试时可开启,帮助跟踪数据
                   messageHandler.ResponseDocument.Save(
                       Server.MapPath("~/App_Data/" + DateTime.Now.Ticks + "_Response_" +
                                      messageHandler.ResponseMessage.ToUserName + ".txt"));
                   WriteContent(messageHandler.ResponseDocument.ToString());
                   return;
               }
               catch (Exception ex)
               {
                   //将程序运行中发生的错误记录到App_Data文件夹
                   using (TextWriter tw = new StreamWriter(Server.MapPath("~/App_Data/Error_" + DateTime.Now.Ticks + ".txt")))
                   {
                       tw.WriteLine(ex.Message);
                       tw.WriteLine(ex.InnerException.Message);
                       if (messageHandler.ResponseDocument != null)
                       {
                           tw.WriteLine(messageHandler.ResponseDocument.ToString());
                       }
                       tw.Flush();
                       tw.Close();
                   }
                   WriteContent("");
               }
               finally
               {
                   Response.End();
               }
           }
       }
       private void WriteContent(string str)
       {
           Response.Output.Write(str);
       }

 

1)当Get请求时,调用 CheckSignature.Check(signature, timestamp, nonce, Token) 方法验证url接入, 详情参考 用c#开发微信(1)服务号的服务器配置和企业号的回调模式 - url接入 (源码下载)

2)  当有Post请求过来时,调用自定义MessageHandler类,对微信请求的详细判断操作都在这里面。

var messageHandler = new CustomMessageHandler(Request.InputStream, maxRecordCount);

messageHandler.Execute();

2. 自定义消息处理类

定义CustomMessageHandler继承MessageHandler<MessageContext<IRequestMessageBase, IResponseMessageBase>>

public partial class CustomMessageHandler : MessageHandler<MessageContext<IRequestMessageBase, IResponseMessageBase>>
{
    public CustomMessageHandler(Stream inputStream, int maxRecordCount = 0)
        : base(inputStream, null, maxRecordCount)
    {
        WeixinContext.ExpireMinutes = 3;
    }
    public override void OnExecuting()
    {
        //测试MessageContext.StorageData
        if (CurrentMessageContext.StorageData == null)
        {
            CurrentMessageContext.StorageData = 0;
        }
        base.OnExecuting();
    }
    public override void OnExecuted()
    {
        base.OnExecuted();
        CurrentMessageContext.StorageData = ((int)CurrentMessageContext.StorageData) + 1;
    }
}

 

3. 分别重写7种接收普通消息

我们可以通过重写MessageHandler里的这7种类型方法来处理我们的业务,当然也可以只重写需要的部分类型,不需要的类型可以不重写,只需要定义一个统一的DefaultResponseMessage

public override IResponseMessageBase DefaultResponseMessage(IRequestMessageBase requestMessage)
{
    //所有没有被处理的消息会默认返回这里的结果
    var responseMessage = this.CreateResponseMessage<ResponseMessageText>();
    responseMessage.Content = "这条消息来自DefaultResponseMessage。";
    return responseMessage;
}

 

下面分别就这7种类型,各写一个例子:

1) 文本消息
/// <summary>
/// 处理文字请求
/// </summary>
/// <returns></returns>
public override IResponseMessageBase OnTextRequest(RequestMessageText requestMessage)
{
    //注意:下面泛型ResponseMessageText即返回给客户端的类型,可以根据自己的需要填写ResponseMessageNews等不同类型。
    var responseMessage = CreateResponseMessage<ResponseMessageText>();
 
    var result = new StringBuilder();
    result.AppendFormat("您刚才发送了文字信息:{0}\r\n\r\n", requestMessage.Content);
 
    if (CurrentMessageContext.RequestMessages.Count > 1)
    {
        result.AppendFormat("您刚才还发送了如下消息({0}/{1}):\r\n", CurrentMessageContext.RequestMessages.Count, CurrentMessageContext.StorageData);
        for (int i = CurrentMessageContext.RequestMessages.Count - 2; i >= 0; i--)
        {
            var historyMessage = CurrentMessageContext.RequestMessages[i];
            result.AppendFormat("{0} 【{1}】{2}\r\n",
                                historyMessage.CreateTime.ToShortTimeString(),
                                historyMessage.MsgType.ToString(),
                                (historyMessage is RequestMessageText)
                                    ? (historyMessage as RequestMessageText).Content
                                    : "[非文字类型]"
                );
        }
        result.AppendLine("\r\n");
    }
    result.AppendFormat("如果您在{0}分钟内连续发送消息,记录将被自动保留(当前设置:最多记录{1}条)。过期后记录将会自动清除。\r\n", WeixinContext.ExpireMinutes, WeixinContext.MaxRecordCount);
    result.AppendLine("\r\n");
    result.AppendLine("您还可以发送【位置】【图片】【语音】【视频】等类型的信息(注意是这几种类型,不是这几个文字),查看不同格式的回复。");
    responseMessage.Content = result.ToString();
    return responseMessage;
}

 

 

2) 图片消息
/// <summary>
/// 处理图片请求
/// </summary>
/// <param name="requestMessage"></param>
/// <returns></returns>
public override IResponseMessageBase OnImageRequest(RequestMessageImage requestMessage)
{
var responseMessage = CreateResponseMessage<ResponseMessageNews>();
responseMessage.Articles.Add(new Article()
{
    Title = "您刚才发送了图片信息",
    Description = "您发送的图片将会显示在边上",
    PicUrl = requestMessage.PicUrl,
    Url = "http://www.hp.com"
});
responseMessage.Articles.Add(new Article()
{
    Title = "第二条",
    Description = "第二条带连接的内容",
    PicUrl = requestMessage.PicUrl,
    Url = "http://www.hp.com"
});
return responseMessage;
}


3) 语音消息
/// <summary>
/// 处理语音请求
/// </summary>
/// <param name="requestMessage"></param>
/// <returns></returns>
public override IResponseMessageBase OnVoiceRequest(RequestMessageVoice requestMessage)
{
    var responseMessage = CreateResponseMessage<ResponseMessageMusic>();
    responseMessage.Music.MusicUrl = "http://www.qxuninfo.com/music.mp3";
    responseMessage.Music.Title = "这里是一条音乐消息";
    responseMessage.Music.Description = "时间都去哪儿了";
    return responseMessage;
}


4) 视频消息
/// <summary>
/// 处理视频请求
/// </summary>
/// <param name="requestMessage"></param>
/// <returns></returns>
public override IResponseMessageBase OnVideoRequest(RequestMessageVideo requestMessage)
{
    var responseMessage = CreateResponseMessage<ResponseMessageText>();
    responseMessage.Content = "您发送了一条视频信息,ID:" + requestMessage.MediaId;
    return responseMessage;
}


5) 小视频消息
/// <summary>
/// 处理小视频请求
/// </summary>
/// <param name="requestMessage"></param>
/// <returns></returns>
public override IResponseMessageBase OnShortVideoRequest(RequestMessageShortVideo requestMessage)
{
    var responseMessage = this.CreateResponseMessage<ResponseMessageText>();
    responseMessage.Content = "您刚才发送的是小视频";
    return responseMessage;
}


6) 地理位置消息
/// <summary>
/// 处理位置请求
/// </summary>
/// <param name="requestMessage"></param>
/// <returns></returns>
public override IResponseMessageBase OnLocationRequest(RequestMessageLocation requestMessage)
{
    var responseMessage = CreateResponseMessage<ResponseMessageText>();
    responseMessage.Content = string.Format("您刚才发送了地理位置信息。Location_X:{0},Location_Y:{1},Scale:{2},标签:{3}",
                      requestMessage.Location_X, requestMessage.Location_Y,
                      requestMessage.Scale, requestMessage.Label);
    return responseMessage;
}


7) 链接消息
/// <summary>
/// 处理链接消息请求
/// </summary>
/// <param name="requestMessage"></param>
/// <returns></returns>
public override IResponseMessageBase OnLinkRequest(RequestMessageLink requestMessage)
{
    var responseMessage = CreateResponseMessage<ResponseMessageText>();
    responseMessage.Content = string.Format(@"您发送了一条连接信息:
Title:{0} 
Description:{1}
Url:{2}", requestMessage.Title, requestMessage.Description, requestMessage.Url);
    return responseMessage;
}

 

 

从上面的例子中可以看出,回复的消息类型可以多种多样,不一定要跟请求的消息类型一样。

 

  • 框架里的请求类型:

用c#开发微信(3)基于Senparc.Weixin框架的接收普通消息处理 (源码下载)

 

  • 框架里的回复类型:

用c#开发微信(3)基于Senparc.Weixin框架的接收普通消息处理 (源码下载)

 

4. 最后发布到自己的服务器上,可以尝试给公众号发各种类型的消息,验证公众号回复的内容

 

5. 源码

最后整个程序结构如下:

用c#开发微信(3)基于Senparc.Weixin框架的接收普通消息处理 (源码下载)

源码下载: http://yunpan.cn/cwsftnRtzK599  访问密码 4247

同样的,使用源码前,要先把配置文件里的参数修改成自己的公众号。

部份类型效果截图:

用c#开发微信(3)基于Senparc.Weixin框架的接收普通消息处理 (源码下载)

官方文档: 接收普通消息

 

用c#开发微信 系列汇总

用c#开发微信(3)基于Senparc.Weixin框架的接收普通消息处理 (源码下载)

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