“捕获”过程输出

Question

这是我的方法，该方法开始处理：

public class Tshark 
{ 
    public int _interfaceNumber; 
    public string _pcapPath; 
    Process _tsharkProcess; 
    public int _packetsCount; 
    public string _packet; 
    public string _tsharkPath = @"C:\Program Files\Wireshark\tshark.exe"; 
    public delegate void dlgPackProgress(int progress); 
    public event dlgPackProgress evePacketProgress; 

    public Tshark(int interfaceNumber, string pcapPath) 
    { 
     _interfaceNumber = interfaceNumber; 
     _pcapPath = pcapPath; 
    } 

    public void startTheCapture() 
    { 
     try 
     { 
      _tsharkProcess = new Process(); 
      _tsharkProcess.StartInfo.FileName = @"C:\Program Files\Wireshark\tshark.exe"; 
      _tsharkProcess.StartInfo.Arguments = string.Format("-i " + _interfaceNumber); 
      _tsharkProcess.OutputDataReceived += new DataReceivedEventHandler(process_OutputDataReceived); 
      _tsharkProcess.StartInfo.RedirectStandardOutput = true; 
      _tsharkProcess.StartInfo.UseShellExecute = false; 
      _tsharkProcess.StartInfo.CreateNoWindow = true; 
      _tsharkProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden; 
      _tsharkProcess.Start(); 
      StreamReader myStreamReader = _tsharkProcess.StandardOutput; 

      while (!myStreamReader.EndOfStream) 
      { 
       _packet = myStreamReader.ReadLine(); 
       OnPacketProgress(_packetsCount++); 
      } 

      _tsharkProcess.WaitForExit(); 
     } 
     catch (Exception e) 
     { 

     } 
    } 

    private void OnPacketProgress(int packet) 
    { 
     var handler = evePacketProgress; 
     if (handler != null) 
     { 
      handler(packet); 
     } 
    } 

    public void killProcess() 
    { 
     foreach (Process prc in System.Diagnostics.Process.GetProcessesByName("tshark")) 
      { 
       prc.Kill(); 
       prc.WaitForExit(); 
      }     
    } 

    private void process_OutputDataReceived(object sender, DataReceivedEventArgs arg) 
    { 
     string srt = arg.Data; //arg.Data contains the output data from the process...    
    } 
} 

方法startTheCapture（）被从主模中调用：

private void btnStartCapture_Click(object sender, EventArgs e) 
{ 
    BackgroundWorker bgWorker = new BackgroundWorker(); 
    bgWorker.WorkerReportsProgress = true; 
    bgWorker.ProgressChanged += new ProgressChangedEventHandler(bgWSniffer_ProgressChanged); 
    bgWorker.DoWork += new DoWorkEventHandler(
     (s3, e3) => 
     { 
      tshark = new Tshark(2, pcapFilePathSniffer); 
      tshark.startTheCapture(); 

      tshark.evePacketProgress += new Tshark.dlgPackProgress(
       (packet) => 
       { 
        bgWorker.ReportProgress(packet, tshark); 
       }); 
     }); 

    bgWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(
     (s3, e3) => 
     { 

     }); 

    bgWorker.RunWorkerAsync(); 

} 

现在这也是从主窗体，我写了ProgressChanged应该更新我的GUI，但我的问题是，这是行不通的，我不明白为什么。

private void bgWSniffer_ProgressChanged(object sender, ProgressChangedEventArgs e) 
{ 
    tshark = e.UserState as Tshark; 
    listBoxPacketsSnifferTab.Text += tshark._packet; 
    lblPacketsReceived2.Text = tshark._packetsCount.ToString("#,##0"); 
} 

Answer 1

在DoWorkEventHandler，你叫tshark.StartTheCapture（）你联播evePacketProgress事件处理程序之前。

startTheCapture方法阻塞，直到wireshark进程退出，因此在运行时捕获的任何进度事件将在OnPacketProgress中被“忽略”，因为没有事件订阅者（handler == null）。

它改成这样：

bgWorker.DoWork += new DoWorkEventHandler(
    (s3, e3) => 
    { 
     tshark = new Tshark(2, pcapFilePathSniffer); 

     //hookup event handler before executing method 
     tshark.evePacketProgress += new Tshark.dlgPackProgress(
      (packet) => 
      { 
       bgWorker.ReportProgress(packet, tshark); 
      }); 

     tshark.startTheCapture(); 


    });