一个用于从Google抓取图像的程序.我需要帮助.

更新时间：2023-11-20 16:08:10

That code is updated here:

http://blogs.msdn.com/danielfe/archive/2004/07/26/197811.aspx

This is my code in Main.cs:

#region

Directives

using

System;

using

System.Collections.Generic;

using

System.ComponentModel;

using

System.Data;

using

System.Drawing;

using

System.Text;

using

System.Windows.Forms;

using

System.IO;

using

System.Net;

using

System.Diagnostics;

using

Google_Image_Grabber;

#endregion

namespace

Google_Image_Grabber

{

public partial class Main : Form

{

public Main()

{

InitializeComponent();

}

internal Dictionary<string, Image> GoogleImages = new Dictionary<string, Image>();

#region

Form Events

private void button1_Click(object sender, EventArgs e)

{

ResetForm();

backgroundWorker1.RunWorkerAsync(textBox1.Text);

}

private void ResetForm()

{

try

{

listView1.Items.Clear();

imageList1.Images.Clear();

progressBar1.Value = 0;

progressBar1.Visible =

true;

}

catch (System.Exception Ex)

{

LogError(Ex);

}

private void imageList_ItemActivate(object sender, EventArgs e)

{

ListView.SelectedListViewItemCollection Items = listView1.SelectedItems;

string url = WebUtilities.ConvertToHighResGoogleUrl(@Items[0].Text);

try

{

using (Stream ImageStream = new WebClient().OpenRead(url))

{

pictureBox1.Image =

Image.FromStream(ImageStream);

}

catch

{

//Use low res image if high res throws exception

pictureBox1.Image = GoogleImages[Items[0].Text];

}

private void SetStretch_Click(object sender, EventArgs e)

{

Wallpaper.SetWallpaper(pictureBox1.Image, Wallpaper.Style.Stretched);

MessageBox.Show("Wallpaper Changed");

}

private void SetTile_Click(object sender, EventArgs e)

{

Wallpaper.SetWallpaper(pictureBox1.Image, Wallpaper.Style.Tiled);

MessageBox.Show("Wallpaper Changed");

}

private void SetCenter_Click(object sender, EventArgs e)

{

Wallpaper.SetWallpaper(pictureBox1.Image, Wallpaper.Style.Centered);

MessageBox.Show("Wallpaper Changed");

}

#endregion

#region

Background Worker Code

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)

{

int progress = 0;

Dictionary<string, Image> UrlAndImage = new Dictionary<string, Image>();

//Parse Web Page for image Urls

List<string> imgUrls = WebUtilities.GetImagesFromGoogle((string)e.Argument);

backgroundWorker1.ReportProgress(progress++);

//Load images

foreach (string url in imgUrls)

{

try

{

Stream ImageStream = new WebClient().OpenRead(url);

Image img = Image.FromStream(ImageStream);

UrlAndImage.Add(url, img);

}

catch

{ }

finally

{

backgroundWorker1.ReportProgress(progress++);

}

//Send result back to Form

e.Result = UrlAndImage;

}

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)

{

progressBar1.Value = e.ProgressPercentage;

}

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

{

progressBar1.Visible =

false;

GoogleImages = (

Dictionary<string, Image>)e.Result;

foreach (string key in GoogleImages.Keys)

{

imageList1.Images.Add(key, GoogleImages[key]);

listView1.Items.Add(key, key);

}

#endregion

#region

Utilities

private void LogError(Exception Ex)

{

Debug.WriteLine(Ex.Message);

}

#endregion

private void contextMenuStrip1_Click(object sender, EventArgs e)

{

Wallpaper.SetWallpaper(pictureBox1.Image, Wallpaper.Style.Stretched);

MessageBox.Show("Wallpaper Changed");

}

This is my code in WebUtilities.cs:

#region

Using directives

using

System;

using

System.Drawing;

using

System.Collections.Generic;

using

System.Text;

using

System.Net;

using

System.IO;

using

System.Text.RegularExpressions;

using

System.Diagnostics;

#endregion

static

class WebUtilities

{

#region

Google-Specific Methods

/// <summary>

/// Returns a list of URLs with low res images from Google

/// </summary>

/// <param name="search">text to search</param>

/// <returns>Generic list of image URLs</returns>

public static List<string> GetImagesFromGoogle(string search)

{

string googleUrl = "http://images.google.com/images?q=" + search;

List<string> urlList = new List<string>();

string html = GetHtml(googleUrl);

string regExPattern = @"< \s* img [^\>]* src \s* = \s* [\""\']? ( [^\""\'\s>]* )";

Regex r = new Regex(regExPattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);

MatchCollection matches = r.Matches(html);

foreach (Match m in matches)

{

//only return images from the search result (aka not Google's logo or ads)

if (m.Groups[1].Value.ToString().IndexOf("/images?") != -1)

{

//Provide full path for image

string imageUrl = @"http://images.google.com" + m.Groups[1].Value;

urlList.Add(imageUrl);

}

return urlList;

}

/// <summary>

/// Given a low res URL from Google, returns the high[er] res URL for the image

/// </summary>

/// <param name="url">low res URL</param>

/// <returns>high res URL</returns>

public static string ConvertToHighResGoogleUrl(string url)

{

return @"http://" + @url.Substring(51); }

#endregion

#region

Other Utility Methods

/// <summary>

/// Returns a stream of the contents of a URL

/// </summary>

/// <param name="url">A valid URL</param>

/// <returns>URL contents</returns>

public static Stream GetStreamFromUrl(string url)

{

return new WebClient().OpenRead(url); }

/// <summary>

/// Checks whether calling a URL will throw an exception

/// </summary>

/// <param name="url">URL to validate</param>

/// <returns>true if no error was thrown</returns>

public static bool ValidUrl(string url)

{

try

{

using (System.IO.Stream s = new WebClient().OpenRead(url))

{

return true;

}

catch (System.Net.WebException ex)

{

Debug.WriteLine("Message: " + ex.Message);

Debug.WriteLine("Status: " + ex.Status);

return false;

}

catch (System.Exception ex)

{

Debug.WriteLine("Message: " + ex.Message);

return false;

}

/// <summary>

/// Retrieves a list of the image urls for a given web page

/// </summary>

/// <param name="url">a url</param>

/// <returns>Generic list of image urls</returns>

public static List<string> GetAllImagesFromUrl(string url)

{

List<string> urlList = new List<string>();

MatchCollection matches = GetImageMatches(url);

foreach (Match m in matches)

{

urlList.Add(m.Groups[1].Value);

}

return urlList;

}

/// <summary>

/// Calls a url and retrieves the contents as a string

/// </summary>

/// <param name="url">url to retrieve</param>

/// <returns>html string of url contents</returns>

public static string GetHtml(string url)

{

using (StreamReader sr = new StreamReader(GetStreamFromUrl(url)))

{

return sr.ReadToEnd(); }

}

#endregion

#region

Private Utility Methods

private static MatchCollection GetImageMatches(string url)

{

string html = GetHtml(@url);

string regExPattern = @"< \s* img [^\>]* src \s* = \s* [\""\']? ( [^\""\'\s>]* )";

Regex r = new Regex(regExPattern, RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);

MatchCollection matches = r.Matches(html);

return matches;

}

#endregion

}

This is my code in Wallpaper.cs:

#region

Using directives

using

System;

using

System.Collections.Generic;

using

System.ComponentModel;

using

System.Data;

using

System.Drawing;

using

System.Text;

using

System.Windows.Forms;

using

System.Runtime.InteropServices;

using

System.IO;

using

Microsoft.Win32;

using

System.Net;

#endregion

namespace

Google_Image_Grabber

{

/// <summary>

/// Wallpaper class used to set the Windows Wallpaper.

/// </summary>

public sealed class Wallpaper

{

Wallpaper() { }

const int SPI_SETDESKWALLPAPER = 20;

const int SPIF_UPDATEINIFILE = 0x01;

const int SPIF_SENDWININICHANGE = 0x02;

[

DllImport("user32.dll", CharSet = CharSet.Auto)]

static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

public enum Style : int

{

Tiled,

Centered,

Stretched

}

public static void SetWallpaper(Image img, Style style)

{

string tempPath = Path.Combine(Path.GetTempPath(), "wallpaper.bmp");

img.Save(tempPath, System.Drawing.Imaging.

ImageFormat.Bmp);

RegistryKey key = Registry.CurrentUser.OpenSubKey(@"Control Panel\Desktop", true);

if (style == Style.Stretched)

{

key.SetValue(

@"WallpaperStyle", 2.ToString());

key.SetValue(

@"TileWallpaper", 0.ToString());

}

else if (style == Style.Centered)

{

key.SetValue(

@"WallpaperStyle", 1.ToString());

key.SetValue(

@"TileWallpaper", 0.ToString());

}

else if (style == Style.Tiled)

{

key.SetValue(

@"WallpaperStyle", 1.ToString());

key.SetValue(

@"TileWallpaper", 1.ToString());

}

SystemParametersInfo(SPI_SETDESKWALLPAPER,

tempPath,

SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE);

}

I realize that this is a lot of code to look over however I cannot get the images to show up in my ListView control but I see no error in the code and it debugs fine. I'm stumped.

That code is updated here:

http://blogs.msdn.com/danielfe/archive/2004/07/26/197811.aspx

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一个用于从Google抓取图像的程序.我需要帮助.

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