GCM request in Asp.net

Question

I have reffered this link for sending GCM request and it is working perfectly fine. gcm-push-notification-with-asp-net

I referred one more link to post JSON how-to-post-json-to-the-server

On the basis of second link I have tried the following code.

        var httprequest = (HttpWebRequest)WebRequest.Create("https://gcm-http.googleapis.com/gcm/send");
        httprequest.ContentType = "application/json";
        httprequest.Method = "POST";
        httprequest.Headers.Add(string.Format("Authorization: key={0}", GCM.APIKey));
        httprequest.Headers.Add(string.Format("Sender: id={0}", GCM.ProjectNo));

        using (var streamWriter = new StreamWriter(httprequest.GetRequestStream()))
        {
            string json = new JavaScriptSerializer().Serialize(new GCMValues
            {
                delay_while_idle = false,
                priority = "high",
                registration_id = regId,
                data = new MessagesValues
                {
                    message = message
                }
            });

            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();
        }

        var httpResponse = (HttpWebResponse)httprequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
        }

Properties that I have used

public class GCMValues
{
    public Object data { get; set; }
    public bool delay_while_idle { get; set; }
    public String priority { get; set; }
    public String registration_id { get; set; }
}
public class MessagesValues
{
    public String message { get; set; }
    public DateTime? time { get; set; }
}

The problem I am facing is at line var httpResponse =(HttpWebResponse)httprequest.GetResponse();

I am getting a response of bad request. Where I went wrong or what could be done to pass the values in JSON format for GCM post request. Thanks in advance.

Magnus Smith · Accepted Answer · 2016-02-10T21:56:16.870

0

You need registration_ids (plural) not registration_id (singular) in the JSON. It is an array of strings , not a single string value.

If you check the GCM documentation it gives all the JSON options.

Elsewhere the documentation details how to use to if you have just one token to send a notification to, as in this example:

  {
    "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...",
    "notification" : {
      "body" : "great match!",
      "title" : "Portugal vs. Denmark",
      "icon" : "myicon"
    }
  }

edited Feb 10 '16 at 21:56

answered Feb 10 '16 at 21:49

Magnus Smith

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Thanks I have used the hints provided by you, and it worked – SimplyProgrammer Feb 11 '16 at 08:08

score 0 · Answer 2 · answered Feb 11 '16 at 08:13

I have used the following way to get it done, and it worked.

var httprequest = (HttpWebRequest)WebRequest.Create("https://gcm-http.googleapis.com/gcm/send");
        httprequest.ContentType = "application/json";
        httprequest.Method = "POST";
        httprequest.Headers.Add(string.Format("Authorization: key={0}", GCM.APIKey));
        httprequest.Headers.Add(string.Format("Sender: id={0}", GCM.ProjectNo));
        String[] regid = regId.Split(',');

        using (var streamWriter = new StreamWriter(httprequest.GetRequestStream()))
        {
            string json = new JavaScriptSerializer().Serialize(new GCMValues
            {
                delay_while_idle = false,
                priority = "high",
                registration_ids = regid,
                data = new MessagesValues
                {
                    message = message
                }
            });

            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();
        }

        var httpResponse = (HttpWebResponse)httprequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            if (result.Contains("Error"))
            {
                return false;
            }
        }

Properties that I have used

public class GCMValues
{
    public Object data { get; set; }
    public bool delay_while_idle { get; set; }
    public String priority { get; set; }
    public String[] registration_ids { get; set; }
}
public class MessagesValues
{
    public String message { get; set; }
    public DateTime? time { get; set; }
}

GCM request in Asp.net

2 Answers2