实例介绍
【实例简介】
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using NWebCrawlerLib;
using System.Diagnostics;
namespace NWebCrawler
{
public partial class MainForm : Form
{
#region Fields
private PerformanceCounter m_cpuCounter;
private PerformanceCounter m_ramCounter;
private Downloader m_downloader;
#endregion
#region Properties
// number of bytes downloaded
private int nByteCount;
private int ByteCount
{
get { return nByteCount; }
set
{
nByteCount = value;
this.statusStrip.Text = Commas(nByteCount / 1024 1) " KB";
}
}
// number of Uri's found
private int nURLCount;
private int URLCount
{
get { return nURLCount; }
set
{
nURLCount = value;
this.statusBarPanelURLs.Text = Commas(nURLCount) " URL found";
}
}
// available memory
private float nFreeMemory;
private float FreeMemory
{
get { return nFreeMemory; }
set
{
nFreeMemory = value;
this.statusBarPanelMem.Text = nFreeMemory " MB Available";
}
}
// CPU usage
private int nCPUUsage;
private int CPUUsage
{
get { return nCPUUsage; }
set
{
nCPUUsage = value;
this.statusBarPanelCPU.Text = "CPU usage " nCPUUsage "%";
}
}
// number of files downloaded
private int nFileCount;
private int FileCount
{
get { return nFileCount; }
set
{
nFileCount = value;
this.statusBarPanelFiles.Text = Commas(nFileCount) " file(s) downloaded";
}
}
#endregion
public MainForm()
{
InitializeComponent();
m_cpuCounter = new PerformanceCounter();
m_cpuCounter.CategoryName = "Processor";
m_cpuCounter.CounterName = "% Processor Time";
m_cpuCounter.InstanceName = "_Total";
m_ramCounter = new PerformanceCounter("Memory", "Available MBytes");
m_downloader = new Downloader();
m_downloader.StatusChanged = new DownloaderStatusChangedEventHandler(DownloaderStatusChanged);
}
#region Helpers
string Commas(int nNum)
{
string str = nNum.ToString();
int nIndex = str.Length;
while (nIndex > 3)
{
str = str.Insert(nIndex - 3, ",");
nIndex -= 3;
}
return str;
}
void ShowSettingsDialog()
{
SettingsForm dialog = new SettingsForm();
if (dialog.ShowDialog() == DialogResult.OK)
{
}
}
#endregion
#region UI Events
private void exitToolStripMenuItem_Click(object sender, EventArgs e)
{
this.Close();
}
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
ShowSettingsDialog();
}
private void buttonResume_Click(object sender, EventArgs e)
{
m_downloader.Resume();
}
private void buttonPause_Click(object sender, EventArgs e)
{
m_downloader.Suspend();
}
private void buttonStop_Click(object sender, EventArgs e)
{
m_downloader.Abort();
}
private void buttonSettings_Click(object sender, EventArgs e)
{
ShowSettingsDialog();
}
#endregion
private void buttonGo_Click(object sender, EventArgs e)
{
m_downloader.InitSeeds(new string[] { txtSeed.Text });//5 1 a s p x
m_downloader.Start();
}
delegate void UpdateDataGridCallback(Downloader d);
private void UpdateDataGrid(Downloader d)
{
try
{
if (this.dataGridThreads.InvokeRequired)
{
UpdateDataGridCallback callback = new UpdateDataGridCallback(UpdateDataGrid);
this.Invoke(callback, new object[] { d });
}
else
{
dataGridThreads.DataSource = typeof(CrawlerThread[]);
dataGridThreads.DataSource = d.Crawlers;
dataGridThreads.Columns["Name"].Width = 100;
dataGridThreads.Columns["Status"].Width = 100;
}
}
catch (ObjectDisposedException)
{
}
}
delegate void UpdateStatusStripCallback();
private void UpdateStatusStrip()
{
if (this.statusStrip.InvokeRequired)
{
UpdateStatusStripCallback callback = new UpdateStatusStripCallback(UpdateStatusStrip);
this.Invoke(callback, new object[] { });
}
else
{
statusBarPanelCPU.Text = string.Format("CPU: {0:0.00}%", m_cpuCounter.NextValue());
statusBarPanelMem.Text = string.Format("Mem: {0:0.00}MB", m_ramCounter.NextValue());
statusBarPanelURLs.Text = string.Format("URLs: {0}", m_downloader.UrlsQueueFrontier.Count.ToString());
statusBarPanelFiles.Text = string.Format("Files: {0}", m_downloader.CrawleHistroy.Count.ToString());
statusBarPanelSpeed.Text = string.Format("Speed: {0:0.00}KB/sec", m_downloader.GetDownloadSpeed());
statusBarPanelByteCount.Text = string.Format("Total size: {0:0.00}MB", 1.0 * m_downloader.TotalSize / 1024 / 1024);
}
}
private void DownloaderStatusChanged(object sender, DownloaderStatusChangedEventArgs e)
{
Downloader d = (Downloader)sender;
UpdateDataGrid(d);
}
private void timer_Tick(object sender, EventArgs e)
{
UpdateStatusStrip();
}
private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
m_downloader.Abort();
m_downloader.Dump("dump.txt");
}
}
}
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