UWP streamsocket ping networktimer issues

Question

I have a StreamSocket in UWP and I send my messages like this using a DataWriter object using the StoreAsync() method:

        public static async Task<bool> SendNetworkMessage(NetworkMember member, NetworkMessage message)
    {
        DataWriter writer = member.DataWriter;

        //Check that writer is not null
        if (writer != null)
        {
            try
            {
                //Serialize Message
                string stringToSend = SerializeObject<NetworkMessage>(message);

                //Send Message Length
                writer.WriteUInt32(writer.MeasureString(stringToSend));

                //Send Message
                writer.WriteString(stringToSend);

                await writer.StoreAsync();


                return true;
            }
            catch (Exception e)
            {

                Debug.WriteLine("DataWriter failed because of " + e.Message);

                Debug.WriteLine("");

                Disconnect(member);

                OnMemberDisconnectedEvent(member);
                return false;
            }
        }
        else { return false; }
    }

All is well, the only problem is that I don't know if a connection went down. Now I want to check my connection using a DispatcherTimer like this:

        private static async void NetworkTimer_Tick(object sender, object e)
    {
        foreach (NetworkMember member in networkMemberCollection)
        {
            if (member.Connected == true && member.Disconnecting == false)
            {
                await SendNetworkMessage(member, new PingMessage());

            }
        }}

However, this is causing timing issues which is causing ObjectDisposedExceptions on the DataWriter. It seems that the DispatcherTimer thread cannot use the StreamSocket when I send a message from a different thread. My question is: How can I make sure the Ping is sent each time but that SendNetworkMessage operations are done in order instead of overlapping?

Thanks

score 0 · Answer 1 · edited May 23 '17 at 11:52

It seems that the DispatcherTimer thread cannot use the StreamSocket when I send a message from a different thread.

How can I make sure the Ping is sent each time but that SendNetworkMessage operations are done in order instead of overlapping?

It's possible, and I think your code using foreach and await operation can ensure the work of sending message in order.

the only problem is that I don't know if a connection went down.

If you want to know if the connection went down, you can refer to Handling WinRT StreamSocket disconnects (both server and client side).

UWP streamsocket ping networktimer issues

1 Answers1