internal static MessageEvent FromNative(CDOMessageEvent messageEvnt)
 {
     MessageEvent result = new MessageEvent();
     result._srcUserId = messageEvnt.srcUserId;
     result._data = messageEvnt.data.body;
     return result;
 }
 private void on_message_callback_t(IntPtr opaque,
     ref CDOMessageEvent e)
 {
     try
     {
         if (_listener != null)
             _listener.onMessage(MessageEvent.FromNative(e));
     }
     catch (Exception )
     {
     }
 }