如何在以下上下文中从响应中获取规范 ID？

Question

我是 GCM 的新手，我使用以下方法向 GCM 服务器发送消息。

 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;
    }

在这种情况下，我需要处理规范 ID。我看到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# 中实现相同的功能呢？它没有 getCanonicalIds 方法，因为它是我得到的标准网络响应。如何找到规范 ID 并将其从 table 中删除？请指教

Answer 1

规范 ID 是已在不同 ID 下注册的设备的 ID。当您没有这样的 Id 时，canonical_ids 元素将为您提供 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 将显示为 "registration_id"。这些将按照发送请求的顺序排列。因此，如果您的响应字符串的第 3 个和第 4 个元素具有 "registration_ids" 的值，则意味着您在请求中发送的第 3 个和第 4 个元素 ID 不正确。将 table 中的它们替换为响应中 "registration_ids" 中提供的 ID。下面是从 C# 代码中获取这些索引和 ID 的代码。

class Program
{
    static void Main(string[] args)
    {
        List<String> ids = new List<String>();
        String json ="{\"multicast_id\": \"xxxxx\",\"success\": 7,\"failure\": 0,\"canonical_ids\": 2,\"results\": [{\"message_id\": \"0:xxx%xxxxx\"}, {\"message_id\": \"0:xxx%xxxxx\"}, {\"registration_id\": \"456\",\"message_id\": \"0:xxx%xxxxx\"}, {\"message_id\": \"0:xxx%xxxxx\"}, {\"message_id\": \"0:xxx%xxxxx\"}, {\"registration_id\": \"123\",\"message_id\": \"0:xxx%xxxxx\"}, {\"message_id\": \"0:xxx%xxxxx\"}]}";
        RootObject decryptedMessage = new JavaScriptSerializer().Deserialize<RootObject>(json);
        int position = 0;
        Dictionary<int, String> canonicalIdsAndIndexes = new Dictionary<int, string>();
        foreach (var item in decryptedMessage.results)
        {
            if (item.registration_id != null)
            {
                canonicalIdsAndIndexes.Add(position, item.registration_id);
                Console.WriteLine("message id: {0}, registrationid: {1}", item.message_id, item.registration_id);
            }
            position++;

        }
        Console.ReadLine();
    }
}

public class Result
{
    public string message_id { get; set; }
    public string registration_id { get; set; }
}

public class RootObject
{
    public string multicast_id { get; set; }
    public int success { get; set; }
    public int failure { get; set; }
    public int canonical_ids { get; set; }
    public List<Result> results { get; set; }
}

如何在以下上下文中从响应中获取规范 ID？

How to get the canonical ids from the response in the following context?

.net

c#

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