private void WorkerThreadStart() { lock (this.SyncObject) { QueryServerCompletedEventArgs e = QueryServer(); asyncOperation.PostOperationCompleted(OperationCompleted, e); } }
// Protected Methods /// <summary> /// Raises the QueryServerCompleted event. /// </summary> /// <param name="e">A QueryServerCompletedEventArgs instance.</param> protected virtual void OnQueryServerCompleted(QueryServerCompletedEventArgs e) { EventHandler <QueryServerCompletedEventArgs> eh = QueryServerCompleted; if (eh != null) { eh(this, e); } }
/// <summary> /// This is the 'nuts and bolts' method that queries the server. /// </summary> /// <returns>A QueryServerResults instance that holds the results of the query.</returns> private QueryServerCompletedEventArgs QueryServer() { QueryServerCompletedEventArgs result = new QueryServerCompletedEventArgs(); Initialize(); using (UdpClient client = new UdpClient()) { try { // Configure and connect the socket. IPEndPoint ipEndPoint = RemoteSNTPServer.GetIPEndPoint(); client.Client.SendTimeout = (int)this.Timeout.TotalMilliseconds; client.Client.ReceiveTimeout = (int)this.Timeout.TotalMilliseconds; client.Connect(ipEndPoint); // Send and receive the data, and save the completion DateTime. SNTPData request = SNTPData.GetClientRequestPacket(this.VersionNumber); client.Send(request, request.Length); result.Data = client.Receive(ref ipEndPoint); result.Data.DestinationDateTime = DateTime.Now.ToUniversalTime(); // Check the data if (result.Data.Mode == Mode.Server) { result.Succeeded = true; // Call other method(s) if needed if (this.UpdateLocalDateTime) { this.UpdateTime(result.Data.LocalClockOffset); result.LocalDateTimeUpdated = true; } } else { result.ErrorData = new ErrorData("The response from the server was invalid."); } return(result); } catch (Exception ex) { result.ErrorData = new ErrorData(ex); return(result); } } }
/// <summary> /// /// </summary> /// <param name="remoteSNTPServer">The server to use.</param> /// <param name="timeout">The timeout in milliseconds used for sending and receiving.</param> /// <returns>The real local offset by seconds.</returns> public static double GetLocalClockOffset(RemoteSNTPServer remoteSNTPServer, TimeSpan timeout) { SNTPClient sntpClient = new SNTPClient(); sntpClient.UpdateLocalDateTime = false; sntpClient.RemoteSNTPServer = remoteSNTPServer; sntpClient.Timeout = timeout; QueryServerCompletedEventArgs args = sntpClient.QueryServer(); if (args.Succeeded) { return(args.Data.LocalClockOffset); } else { throw new ApplicationException(args.ErrorData.ErrorText); } }
/// <summary> /// Gets the real local date and time using the default server and the specified timeout. /// If there is an error or exception, DateTime.MinValue is returned. /// </summary> /// <param name="remoteSNTPServer">The server to use.</param> /// <param name="timeout">The timeout in milliseconds used for sending and receiving.</param> /// <returns>The real local date and time.</returns> public static DateTime GetNow(RemoteSNTPServer remoteSNTPServer, TimeSpan timeout) { SNTPClient sntpClient = new SNTPClient(); sntpClient.UpdateLocalDateTime = false; sntpClient.RemoteSNTPServer = remoteSNTPServer; sntpClient.Timeout = timeout; QueryServerCompletedEventArgs args = sntpClient.QueryServer(); if (args.Succeeded) { return(DateTime.Now.AddSeconds(args.Data.LocalClockOffset)); } else { return(DateTime.MinValue); } }