C#:only the backgroundwork running
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Thread: C#:only the backgroundwork running

  1. #1
    Join Date
    Sep 2007
    Posts
    3

    C#:only the backgroundwork running

    Hi every one!
    I am trying to create a port scanner , I would be able to generate numbers of backgroundworker and each bgwork would scan ports simultaneously, but when I generate 10 bgworkers, there is only the last one working ?! I don't know why? but if I re-click the button there is another bgworker come out and working simultaneously, any body know the reason ? please full fill my knowledge!
    thank you
    Code:
           private void DoAsSyncScan(int index,int begin = IPEndPoint.MinPort, int end = IPEndPoint.MaxPort)
            {
                String ScanAddress;
                IPAddress ScanIPAddress;
                startedflg = true;
                try
                {
                    ScanAddress = "127.0.0.1";
                    Action atxtb = () =>
                    {
                        if (textBoxIP.Text != string.Empty)
                            ScanAddress = textBoxIP.Text;
                    };
                    Dispatcher.BeginInvoke(atxtb);
    
                    // Both a hostname or an IP address are fine
                    if (PortScanning.PortScanning.IsIpAddress(ScanAddress))
                    {
                        ScanIPAddress = IPAddress.Parse(ScanAddress);
                    }
                    else if (!PortScanning.PortScanning.LookupDNSName(ScanAddress, out ScanIPAddress))
                    {
                        MessageBox.Show("Error looking up {0}", ScanAddress);
                        return;
                    }
    
                    // Report what we are going to do
    
                    // Scan all the possible posts
                    for (int Port = begin; Port < end; Port++)
                    {
                        //invoke the dispatcher and pass the percentage and max record count
                        Action act1 = () =>
                        {
                            this.UpdateProgressText(index, (begin - begin / end - begin) * 100, end - begin, Port);
                        };
                        Dispatcher.BeginInvoke(act1);
                        var r = dt.NewRow();
                        if (PortScanning.PortScanning.ScanPort(ScanIPAddress, Port))
                        {
                            r["Port"] = Port + "";
                            r["Status"] = "Opened";
                            Action act2 = () =>
                            {
                                dt.Rows.Add(r);
                            };
                            //Parallel.Invoke(act2);
                            Dispatcher.BeginInvoke(act2);
                        }
                        System.Threading.Thread.Sleep(10);
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            BackgroundWorker[] bgworkers;
            System.Data.DataTable dt = new System.Data.DataTable();
            private void buttonScan_Click(object sender, RoutedEventArgs e)
            {
                try
                {
                    bgworkers = new BackgroundWorker[(int)this.decimalUpDownThread.Value];
                    int part = (int)Math.Ceiling((double)IPEndPoint.MaxPort / (double)this.decimalUpDownThread.Value);
                    int begin = 0;
                    Action act0 = () =>
                        {
                            this.dataGrid1.DataContext = dt.DefaultView;
                        };
                    
                    Dispatcher.BeginInvoke(act0);
                    for (; begin < bgworkers.Length; begin++)
                    {
                        bgworkers[begin] = new BackgroundWorker();
                        bgworkers[begin].WorkerSupportsCancellation = true;
                        DoJobs( bgworkers[begin], begin, part);                    
                    }
                    foreach (var item in bgworkers)
                    {
                        item.RunWorkerAsync();  
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
                         
            }
            public void DoJobs(BackgroundWorker bgx,int begin,int part)
            {
                bgx.DoWork += (wsender, we) =>
                {
                    System.Console.WriteLine("started:{0}",we.Argument);
                    if (IPEndPoint.MaxPort > (begin + 1) * part)
                        DoAsSyncScan(begin, begin * part, begin * part);
                    else
                        DoAsSyncScan(begin, begin * part, IPEndPoint.MaxPort);  
                };     
                //System.Threading.Thread.Sleep(1000);                       
            }
    Last edited by Cimperiali; February 5th, 2012 at 06:18 PM. Reason: Added [code] [/code] tags

  2. #2
    Join Date
    Sep 2007
    Posts
    3

    C#:only the backgroundwork running

    Hi every one!
    I am trying to create a port scanner , I would be able to generate numbers of backgroundworker and each bgwork would scan ports simultaneously, but when I generate 10 bgworker , there is only the lasst one working ?! I don't know why? but if I re-click the button there is another bgworker come out and working simultaneously, any body know the reason ? please full fill my knowledge!
    thank you
    private void DoAsSyncScan(int index,int begin = IPEndPoint.MinPort, int end = IPEndPoint.MaxPort)
    {
    String ScanAddress;
    IPAddress ScanIPAddress;
    startedflg = true;
    try
    {
    ScanAddress = "127.0.0.1";
    Action atxtb = () =>
    {
    if (textBoxIP.Text != string.Empty)
    ScanAddress = textBoxIP.Text;
    };
    Dispatcher.BeginInvoke(atxtb);

    // Both a hostname or an IP address are fine
    if (PortScanning.PortScanning.IsIpAddress(ScanAddress))
    {
    ScanIPAddress = IPAddress.Parse(ScanAddress);
    }
    else if (!PortScanning.PortScanning.LookupDNSName(ScanAddress, out ScanIPAddress))
    {
    MessageBox.Show("Error looking up {0}", ScanAddress);
    return;
    }

    // Report what we are going to do

    // Scan all the possible posts
    for (int Port = begin; Port < end; Port++)
    {
    //invoke the dispatcher and pass the percentage and max record count
    Action act1 = () =>
    {
    this.UpdateProgressText(index, (begin - begin / end - begin) * 100, end - begin, Port);
    };
    Dispatcher.BeginInvoke(act1);
    var r = dt.NewRow();
    if (PortScanning.PortScanning.ScanPort(ScanIPAddress, Port))
    {
    r["Port"] = Port + "";
    r["Status"] = "Opened";
    Action act2 = () =>
    {
    dt.Rows.Add(r);
    };
    //Parallel.Invoke(act2);
    Dispatcher.BeginInvoke(act2);
    }
    System.Threading.Thread.Sleep(10);
    }
    }
    catch (Exception ex)
    {
    MessageBox.Show(ex.Message);
    }
    }
    BackgroundWorker[] bgworkers;
    System.Data.DataTable dt = new System.Data.DataTable();
    private void buttonScan_Click(object sender, RoutedEventArgs e)
    {
    try
    {
    bgworkers = new BackgroundWorker[(int)this.decimalUpDownThread.Value];
    int part = (int)Math.Ceiling((double)IPEndPoint.MaxPort / (double)this.decimalUpDownThread.Value);
    int begin = 0;
    Action act0 = () =>
    {
    this.dataGrid1.DataContext = dt.DefaultView;
    };

    Dispatcher.BeginInvoke(act0);
    for (; begin < bgworkers.Length; begin++)
    {
    bgworkers[begin] = new BackgroundWorker();
    bgworkers[begin].WorkerSupportsCancellation = true;
    DoJobs( bgworkers[begin], begin, part);
    }
    foreach (var item in bgworkers)
    {
    item.RunWorkerAsync();
    }
    }
    catch (Exception ex)
    {
    MessageBox.Show(ex.Message);
    }

    }
    public void DoJobs(BackgroundWorker bgx,int begin,int part)
    {
    bgx.DoWork += (wsender, we) =>
    {
    System.Console.WriteLine("started:{0}",we.Argument);
    if (IPEndPoint.MaxPort > (begin + 1) * part)
    DoAsSyncScan(begin, begin * part, begin * part);
    else
    DoAsSyncScan(begin, begin * part, IPEndPoint.MaxPort);
    };
    //System.Threading.Thread.Sleep(1000);
    }

  3. #3
    Join Date
    Jul 2001
    Location
    Sunny South Africa
    Posts
    11,074

    Re: C#:only the backgroundwork running

    [ Merged ]

  4. #4
    Join Date
    Sep 2007
    Posts
    3

    Re: C#:only the backgroundwork running

    [SOLVED]
    Hi All
    I have searched for the problem but there is no results, finally I have found by myself, the problem is my code !
    SOLVED
    public void DoJobs(ref BackgroundWorker bgx,int begin,int part)
    {
    bgx.DoWork += (wsender, we) =>
    {
    System.Console.WriteLine("started:{0}",we.Argument);
    if (IPEndPoint.MaxPort > (begin + 1) * part)
    DoAsSyncScan(begin, begin * part, (begin+1) * part);
    else
    DoAsSyncScan(begin, begin * part, IPEndPoint.MaxPort);
    };
    //System.Threading.Thread.Sleep(1000);
    }

    you see the old code is DoAsSyncScan(begin, begin * part, begin * part); so the first threads would be ended immediately but not the final thread, I have set a condition IPEndPoint.MaxPort > (begin + 1) * part but I didn't use begin+1 , that's the problem , it takes me 3 days , it was something stupid! , whatever I have learn alot

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