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Form1.cs
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Form1.cs
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using System;
using System.ComponentModel;
using System.Drawing;
using System.Net;
using System.Text.RegularExpressions;
using System.Threading;
using System.Windows.Forms;
using NCrawler;
using NCrawler.HtmlProcessor;
using NCrawler.Interfaces;
using NCrawler.Services;
namespace HaveBB.ContentService.App
{
public partial class Form1 : Form
{
private BackgroundWorker _backgroundWorker1;
private Crawler _crawler;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
btnStop.Enabled = false;
txtStartUrl.Text = "http://www.cnblogs.com";
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
rtbEcho.Text += (string) e.UserState + Environment.NewLine;
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
e.Result = ProcessCrawl(sender as BackgroundWorker, e);
}
private bool ProcessCrawl(BackgroundWorker worker, DoWorkEventArgs e)
{
Thread newThread = new Thread(new ThreadStart(_crawler.Crawl));
newThread.Start();
while (true)
{
Thread.Sleep(1000);
if (_backgroundWorker1.CancellationPending)
{
_crawler.Cancel();
newThread.Abort();
e.Cancel = true;
break;
}
}
return true;
}
private void btnStart_Click(object sender, EventArgs e)
{
btnStart.Enabled = false;
btnStop.Enabled = true;
CreateWorker();
CreateCrawler();
_backgroundWorker1.RunWorkerAsync();
}
private void CreateCrawler()
{
ServicePointManager.MaxServicePoints = 999999;
ServicePointManager.DefaultConnectionLimit = 999999;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;
ServicePointManager.CheckCertificateRevocationList = true;
ServicePointManager.EnableDnsRoundRobin = true;
var echo = new EchoStep();
echo.OneWorkFinished += ShowText;
_crawler = new Crawler(
new Uri("http://www.cnblogs.com"),
new HtmlDocumentProcessor(),
echo
)
{
MaximumThreadCount = 1,
MaximumCrawlDepth = 3,
ExcludeFilter = new[]
{
new RegexFilter(
new Regex(@"(\.jpg|\.css|\.js|\.gif|\.jpeg|\.png|\.ico)",
RegexOptions.Compiled |
RegexOptions.CultureInvariant |
RegexOptions.IgnoreCase))
},
};
}
private void CreateWorker()
{
_backgroundWorker1 = new BackgroundWorker
{
WorkerReportsProgress = true,
WorkerSupportsCancellation = true
};
_backgroundWorker1.DoWork += backgroundWorker1_DoWork;
_backgroundWorker1.RunWorkerCompleted += backgroundWorker1_RunWorkerCompleted;
_backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
}
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Cancelled)
{
rtbEcho.Text += "CANCEL!!!";
}
else
{
rtbEcho.Text += "DONE!!!";
}
}
private void ShowText(string text)
{
_backgroundWorker1.ReportProgress(100, text);
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
StopWork();
}
private void StopWork()
{
if (_backgroundWorker1.IsBusy)
{
_backgroundWorker1.CancelAsync();
}
}
private void btnStop_Click(object sender, EventArgs e)
{
StopWork();
btnStart.Enabled = true;
btnStop.Enabled = false;
}
#region Nested type: EchoStep
internal class EchoStep : IPipelineStep
{
#region Delegates
public delegate void OneWorkFinishedHandler(string title);
#endregion
protected RichTextBox EchoControl { get; set; }
#region IPipelineStep Members
/// <summary>
/// </summary>
/// <param name="crawler">
/// The crawler.
/// </param>
/// <param name="propertyBag">
/// The property bag.
/// </param>
public void Process(Crawler crawler, PropertyBag propertyBag)
{
//CultureInfo contentCulture = (CultureInfo)propertyBag["LanguageCulture"].Value;
//string cultureDisplayValue = "N/A";
//if (!contentCulture.IsNull())
//{
// cultureDisplayValue = contentCulture.DisplayName;
//}
lock (this)
{
//EchoControl.Invoke(new ShowTitleDelegate(ShowTitle), propertyBag.Title);
InvokeOneWorkFinished(propertyBag.Title);
//Console.Out.WriteLine(ConsoleColor.Gray, "Url: {0}", propertyBag.Step.Uri);
//Console.Out.WriteLine(ConsoleColor.DarkGreen, "\tContent type: {0}", propertyBag.ContentType);
//Console.Out.WriteLine(ConsoleColor.DarkGreen, "\tContent length: {0}", propertyBag.Text.IsNull() ? 0 : propertyBag.Text.Length);
//Console.Out.WriteLine(ConsoleColor.DarkGreen, "\tDepth: {0}", propertyBag.Step.Depth);
//Console.Out.WriteLine(ConsoleColor.DarkGreen, "\tCulture: {0}", cultureDisplayValue);
//Console.Out.WriteLine(ConsoleColor.DarkGreen, "\tThreadId: {0}", System.Threading.Thread.CurrentThread.ManagedThreadId);
//Console.Out.WriteLine(ConsoleColor.DarkGreen, "\tThread Count: {0}", crawler.ThreadsInUse);
//Console.Out.WriteLine();
}
}
#endregion
public event OneWorkFinishedHandler OneWorkFinished;
public void InvokeOneWorkFinished(string title)
{
OneWorkFinishedHandler handler = OneWorkFinished;
if (handler != null) handler(title);
}
}
#endregion
#region Nested type: ShowTextHandler
private delegate void ShowTextHandler(string text);
#endregion
}
}