MissionPlanner.OSDVideo.dolog C# (CSharp) Method

        void dolog()
        {
            flightdata.Clear();

            using (MAVLinkInterface mine = new MAVLinkInterface())
            {
                try
                {
                    mine.logplaybackfile =
                        new BinaryReader(File.Open(txt_tlog.Text, FileMode.Open, FileAccess.Read, FileShare.Read));
                }
                catch
                {
                    CustomMessageBox.Show("Log Can not be opened. Are you still connected?");
                    return;
                }
                mine.logreadmode = true;
                mine.speechenabled = false;

                mine.readPacket();

                startlogtime = mine.lastlogread;

                double oldlatlngsum = 0;

                int appui = 0;

                while (mine.logplaybackfile.BaseStream.Position < mine.logplaybackfile.BaseStream.Length)
                {
                    MAVLink.MAVLinkMessage packet = mine.readPacket();

                    cs.datetime = mine.lastlogread;

                    cs.UpdateCurrentSettings(null, true, mine);

                    if (appui != DateTime.Now.Second)
                    {
                        // cant do entire app as mixes with flightdata timer
                        this.Refresh();
                        appui = DateTime.Now.Second;
                    }

                    // ignore because of this Exception System.PlatformNotSupportedException: No voice installed on the system or none available with the current security setting.

                    // if ((float)(cs.lat + cs.lng + cs.alt) != oldlatlngsum
                    //     && cs.lat != 0 && cs.lng != 0)

                    DateTime nexttime = mine.lastlogread.AddMilliseconds(-(mine.lastlogread.Millisecond%100));

                    if (!flightdata.ContainsKey(nexttime))
                    {
                        Console.WriteLine(cs.lat + " " + cs.lng + " " + cs.alt + "   lah " +
                                          (float) (cs.lat + cs.lng + cs.alt) + "!=" + oldlatlngsum);
                        CurrentState cs2 = (CurrentState) cs.Clone();

                        try
                        {
                            flightdata.Add(nexttime, cs2);
                        }
                        catch
                        {
                        }

                        oldlatlngsum = (cs.lat + cs.lng + cs.alt);
                    }
                }

                mine.logreadmode = false;
                mine.logplaybackfile.Close();
                mine.logplaybackfile = null;
            }
        }