Question

我是GCM的新手，我使用以下方法将消息发送到GCM服务器。

 public string SendMessage(string RegistrationID, string Message, string AuthString)
    {            
        //-- Create C2DM Web Request Object --//
        HttpWebRequest Request = (HttpWebRequest)WebRequest.Create("https://android.clients.google.com/c2dm/send");
        Request.Method = "POST";
        Request.KeepAlive = false;

        //-- Create Query String --//
        NameValueCollection postFieldNameValue = new NameValueCollection();
        postFieldNameValue.Add("registration_id", RegistrationID);
        postFieldNameValue.Add("collapse_key", "1");
        postFieldNameValue.Add("delay_while_idle", "0");
        // postFieldNameValue.Add("data.message", Message);
        postFieldNameValue.Add("data.payload", Message);           
        string postData = GetPostStringFrom(postFieldNameValue);
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);


        Request.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
        Request.ContentLength = byteArray.Length;

        Request.Headers.Add(HttpRequestHeader.Authorization, "GoogleLogin auth=" + AuthString);

        //-- Delegate Modeling to Validate Server Certificate --//
        ServicePointManager.ServerCertificateValidationCallback += delegate(
                    object
                    sender,
                    System.Security.Cryptography.X509Certificates.X509Certificate
                    pCertificate,
                    System.Security.Cryptography.X509Certificates.X509Chain pChain,
                    System.Net.Security.SslPolicyErrors pSSLPolicyErrors)
        {
            return true;
        };

        //-- Create Stream to Write Byte Array --// 
        Stream dataStream = Request.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();

        //-- Post a Message --//
        WebResponse Response = Request.GetResponse();
        HttpStatusCode ResponseCode = ((HttpWebResponse)Response).StatusCode;
        if (ResponseCode.Equals(HttpStatusCode.Unauthorized) || ResponseCode.Equals(HttpStatusCode.Forbidden))
        {                
            return "Unauthorized - need new token";

        }
        else if (!ResponseCode.Equals(HttpStatusCode.OK))
        {
            return "Response from web service isn't OK";
            //Console.WriteLine("Response from web service not OK :");
            //Console.WriteLine(((HttpWebResponse)Response).StatusDescription);
        }

        StreamReader Reader = new StreamReader(Response.GetResponseStream());
        string responseLine = Reader.ReadLine();

        Reader.Close();

        return responseLine;
    }

我需要在这种情况下处理规范ID。我看到了下面的代码片段，可以在Java中使用。

if (result.getMessageId() != null) {
 String canonicalRegId = result.getCanonicalRegistrationId();
 if (canonicalRegId != null) {
   // same device has more than on registration ID: update database
 }
} else {
 String error = result.getErrorCodeName();
 if (error.equals(Constants.ERROR_NOT_REGISTERED)) {
  // application has been removed from device - unregister database
}
}

但是我怎样才能在C＃中实现同样的目标？它没有getCanonicalIds方法，因为它是我得到的标准Web响应。如何找到规范ID并将其从表中删除？请指教。

Answer 1

规范ID是已经在不同Id下注册的设备ID。当你没有这样的Id时，canonical_ids元素会给你0但是如果它有一个值，那么响应中的canonical_ids元素将显示计数。在您的回复中，这些ID将表示为＆＃34; registration_id＆＃34;。这些将按请求发送的顺序排列。因此，如果响应字符串的第3和第4个元素具有＆＃34; registration_ids＆＃34;的值。这意味着您在请求中发送的第3个和第4个元素ID不正确。使用＆＃34; registration_ids＆＃34;中提供的ID替换它们。在回应中。下面是从C＃代码中获取这些索引和ID的代码。

<system.webServer>
  <modules runAllManagedModulesForAllRequests="true"></modules>
  <handlers>  
    <add
       name="DownFile"
       path="/api/downloads/MyDownload.axd"
       type="MyProject.WebApi.Handlers.MyDownloadAsyncHandler, MyProject.WebApi"
       verb="GET"/>
  </handlers>
</system.webServer>

如何从以下上下文中的响应中获取规范ID？

1 个答案: