一个用于从Google抓取图像的程序.我需要帮助. [英] A program used to grab images from Google. I need help with it.

问题描述

这是我在 Main.cs 中的代码:

#region 指令

使用 系统；

使用 System.Collections.Generic;

使用 System.ComponentModel;

使用 System.Data;

使用 System.Drawing;

使用 System.Text;

使用 System.Windows.Forms;

使用 System.IO;

使用 System.Net;

使用 System.Diagnostics;

使用 Google_Image_Grabber;

#endregion

命名空间 Google_Image_Grabber

{

public 局部 class 主 : 表格

{

public {

InitializeComponent();

}

内部 字典 < string ， 图片 > GoogleImages = 新 词典 < 字符串 ， 图片 >();

#region 表单事件

私有 无效 button1_Click( object 发件人， EventArgs e)

{

ResetForm();

backgroundWorker1.RunWorkerAsync(textBox1.Text);

}

私有 无效 ResetForm()

{

尝试

{

listView1.Items.Clear();

imageList1.Images.Clear();

progressBar1.Value = 0;

progressBar1.Visible = true ;

}

捕获 (系统. 例外 例如)

{

LogError(Ex);

}

}

私有 无效 imageList_ItemActivate( object 发送者， EventArgs e)

{

ListView . SelectedListViewItemCollection Items = listView1.SelectedItems;

字符串 url = <字体颜色=#008080" size = 2> WebUtilities .ConvertToHighResGoogleUrl(@Items [0] .Text) ;

尝试

{

使用 ( 流 ImageStream = 新 WebClient ().OpenRead(url ))

{

pictureBox1.Image = 图片 .FromStream(ImageStream);

}

}

捕获

{

//如果高分辨率会引发异常，请使用分辨率低的图像

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

}

}

私有 无效 SetStretch_Click( object 发件人， EventArgs e)

{

墙纸 .SetWallpaper(pictureBox1.Image， 墙纸 . 样式 .已拉伸)；

MessageBox .Show( "墙纸已更改" );

}

私有 无效 SetTile_Click( object 发件人， EventArgs e)

{

墙纸 .SetWallpaper(pictureBox1.Image， 墙纸 . 样式 .Tiled)；

MessageBox .Show( "墙纸已更改" );

}

私有 无效 SetCenter_Click( object 发件人， EventArgs e)

{

墙纸 .SetWallpaper(pictureBox1.Image， 墙纸 . 样式 .居中)；

MessageBox .Show( "墙纸已更改" );

}

#endregion

#region 后台工作程序代码

私有 无效 backgroundWorker1_DoWork( object 发送者， DoWorkEventArgs e)

{

int 字典 < <字体color =#0000ff" size = 2>字符串 ， 图片 > UrlAndImage = 新 词典 < 字符串 ， 图片 >();

//为图像Urls解析网页

<字体大小= 2>

列表 < <字体颜色=#0000ff" size = 2>字符串 > imgUrls = WebUtilities .GetImagesFromGoogle(( string )e.Argument);

backgroundWorker1.ReportProgress(progress ++);

//加载图像

foreach ( 字符串 网址 in imgUrls)

{

尝试

{

Stream ImageStream = <字体color =#0000ff" size = 2>新 WebClient ().OpenRead(url);

图片 img = <字体color =#008080" size = 2>图片 .FromStream(ImageStream);

UrlAndImage.Add(url，img);

}

捕获

{}

最终

{

backgroundWorker1.ReportProgress(progress ++);

}

}

//将结果发送回表单

e.Result = UrlAndImage;

}

私有 无效 backgroundWorker1_ProgressChanged( object 发送者， ProgressChangedEventArgs e)

{

progressBar1.Value = e.ProgressPercentage;

}

私有 无效 backgroundWorker1_RunWorkerCompleted( object 发送者， RunWorkerCompletedEventArgs e)

{

progressBar1.Visible = false ;

GoogleImages =( 字典 < 字符串 ， 图片 >)e.Result;

foreach ( 字符串 键 in GoogleImages.Keys)

{

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

listView1.Items.Add(key，key);

}

}

#endregion

#region 实用程序

私有 void LogError( Exception 例如)

{

调试 }

#endregion

私有 无效 contextMenuStrip1_Click( object 发送者， EventArgs e)

{

墙纸 .SetWallpaper(pictureBox1.Image， 墙纸 . 样式 .已拉伸)；

MessageBox .Show( "墙纸已更改" );

}

}

}

这是我在 WebUtilities.cs :

#region 使用指令

使用 系统；

使用 System.Drawing;

使用 System.Collections.Generic;

使用 System.Text;

使用 System.Net;

使用 System.IO;

使用 System.Text.RegularExpressions;

使用 System.Diagnostics;

#endregion

静态 class WebUtilities

{

#region Google特定方法

/// < summary>

/// 从Google返回具有低分辨率图像的URL列表

/// </summary>

/// < param name ="search";> 要搜索的文本 </param>

/// < returns> 图片网址的通用列表 </returns>

public 静态 列表 < 字符串 > GetImagesFromGoogle( string 搜索)

{

字符串 googleUrl = <字体color =#800000" size = 2>" http://images.google.com/images?q =" 列表 < <字体颜色=#0000ff" size = 2>字符串 > urlList = 新 列表 < 字符串 字符串 字符串 regExPattern = <字体color =#800000" size = 2> @"< \ s * img [^ \>] * src \ s * = \ s * [\" \']? ([^ \" \'\ s>] *)" 正则表达式 r = <字体颜色=#0000ff" size = 2>新 Regex ( regExPattern， RegexOptions .IgnoreCase | RegexOptions .IgnorePatternWhitespace);

MatchCollection foreach ( 匹配 m 英寸 匹配)

{

//仅返回搜索结果中的图像(又不是Google徽标或广告)

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

{

//提供图像的完整路径

字符串 imageUrl = <字体color =#800000" size = 2> @" http://images.google.com" + m.Groups [1] .Value;

urlList.Add(imageUrl);

}

}

返回 }

/// < summary>

/// 给定Google的低分辨率URL，则返回图像的高分辨率URL

/// </summary>

/// < param name ="url";> 低分辨率URL </param>

/// < returns> 高分辨率URL </returns>

public 静态 字符串 ConvertToHighResGoogleUrl( 字符串 网址)

{ 返回 @" http://" + @url.子串(51); }

#endregion

#region 其他实用程序方法

/// < 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,

0,

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.

解决方案

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,

0,

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.

解决方案

That code is updated here:

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

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