Question

在我的应用程序中我打开Tshark进程并开始捕获并从我的主要表单我更新我的UI。我的一个类属性是我的文件如何创建（pcap文件），在我的UI上我更新此文件长度正在进行中。我的问题是，如果这个文件是新的，长度保持为零，但如果我的文件已经存在，我的UI显示我的长度正在进行（当然文件被覆盖，但我可以看到它在增长）。

    public class Tshark
    {
        #region members
        private Process _tsharkProcess = new Process();
        private int _numberOfPackets;
        private string _tshark;
        private List<string> _list;
        private ProcessStartInfo _process;
        private int _interfaceNumber;
        private string _pcapPath;
        private string _status;
        private double _bitsPerSecond;
        private double _packetsPerSecond;
        private decimal _packetLimitSize;
        private DateTime _lastTimestamp;
        private PacketDevice _device;
        private FileInfo _file;
        private bool _processRunning;

        public void startCapturing()
        {            
            ThreadStart tStarter = delegate { openAdapterForStatistics(_device); };
            Thread thread = new Thread(tStarter);
            thread.IsBackground = true;
            thread.Start();
            ProcessStartInfo tsharkStartInfo = new ProcessStartInfo();
            tsharkStartInfo.FileName = _tshark; 
            tsharkStartInfo.RedirectStandardOutput = true; 
            tsharkStartInfo.RedirectStandardError = true; 
            tsharkStartInfo.RedirectStandardInput = true; 
            tsharkStartInfo.UseShellExecute = false; 
            tsharkStartInfo.CreateNoWindow = true; 
            tsharkStartInfo.Arguments = string.Format(" -i " + _interfaceNumber + " -s " + _packetLimitSize + " -w " + _pcapPath);
            _tsharkProcess.StartInfo = tsharkStartInfo;
            _tsharkProcess.ErrorDataReceived += _cmdProcess_ErrorDataReceived;
            _tsharkProcess.OutputDataReceived += tshark_OutputDataReceived; 
            _tsharkProcess.EnableRaisingEvents = true; 
            _tsharkProcess.Start();
            _processRunning = true;
            _tsharkProcess.BeginOutputReadLine(); 
            _tsharkProcess.BeginErrorReadLine();
_tsharkProcess.WaitForExit(); 
        }

    public long getFileLength()
    {
        _file = new FileInfo(_pcapPath);
        string directoryName = _file.DirectoryName;
        DirectoryInfo directoryInfo = new DirectoryInfo(directoryName);
        FileInfo[] dirs = directoryInfo.GetFiles();
        _file = dirs.FirstOrDefault(f => f.Name.Equals(_file.Name));

        if (_file != null)
        {

            return _file.Length;
        }

        return 0;
    }

        public void refreshFile()
        {            
            if (_file != null)
            {
                _file.Refresh();
            }
        }
}

从主表单我通过计时器更新我的UI：

private void tmrUpdateLbl_Tick(object sender, EventArgs e)
{
    lblFileSizeTabSniffer2.Text = formatBytes(tshark.getFileLength());
    tshark.refreshFile();
}

在dibugger我可以看到，如果文件是新的，_file始终为null，所以在getFileLength（）方法中返回零。

Answer 1

您需要每次（即getFileLength）获取完整的FileInfo以获取最新结果。将相关代码从startCapturing移至getFileLength。

得到我的文件长度

1 个答案: