在鏈接中生成網頁的縮略圖圖像

Question

我想使用該頁面的鏈接生成網頁的預覽縮略圖圖像。我怎樣才能做到這一點？我對C＃.NET，Javascript/JQuery感到滿意。

問候 NLV

Answer 1

放置在您的網頁，並設置的ImageUrl到snapshot.aspx網頁的圖片控制。您是否可以爲頁面設置一些查詢字符串選項。

snapshot.aspx？站點= www.google.come &寬度= 100 &高度= 80 & capWidth = 800 &大寫高度= 600

site This tells the page which site to capture 
width width of the thumnail 
height height of the thumbnail 
capWidth What Width should the Site capture be (the thumbnail is based on this size) 
capHeight What Height should the Site capture be.  

這裏是代碼

using System; 
    using System.Data; 
    using System.Configuration; 
    using System.Collections; 
    using System.Web; 
    using System.Web.Security; 
    using System.Web.UI; 
    using System.Web.UI.WebControls; 
    using System.Web.UI.WebControls.WebParts; 
    using System.Web.UI.HtmlControls; 
    using System.Windows.Forms; 
    using System.Drawing; 
    using System.Drawing.Imaging; 
    using System.Threading; 

public partial class snapshot : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
     string url = ((string.IsNullOrEmpty(Request.Params["site"])) ? "www.google.com":Request.Params["site"]); 
     int width = ((string.IsNullOrEmpty(Request.Params["width"])) ? 200 : int.Parse(Request.Params["width"])); 
     int height = ((string.IsNullOrEmpty(Request.Params["height"])) ? 140 : int.Parse(Request.Params["height"])); 
     int capWidth = ((string.IsNullOrEmpty(Request.Params["capWidth"])) ? 800 : int.Parse(Request.Params["capWidth"])); 
     int capHeight = ((string.IsNullOrEmpty(Request.Params["capHeight"])) ? 600 : int.Parse(Request.Params["capHeight"])); 

     string address = "http://" + url; 
     Bitmap thumbnail = WebsiteThumbnailImageGenerator.GetWebSiteThumbnail(address, capWidth, capHeight, width, height); 

     Response.ContentType = "image/jpeg"; 
     thumbnail.Save (Response.OutputStream, ImageFormat.Jpeg); 
    } 
} 

public class WebsiteThumbnailImageGenerator 
{ 
    public static Bitmap GetWebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight) 
    { 
     WebsiteThumbnailImage thumbnailGenerator = new WebsiteThumbnailImage(Url, BrowserWidth, BrowserHeight, ThumbnailWidth, ThumbnailHeight); 
     return thumbnailGenerator.GenerateWebSiteThumbnailImage(); 
    } 

    private class WebsiteThumbnailImage 
    { 
     public WebsiteThumbnailImage(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight) 
     { 
      this.m_Url = Url; 
      this.m_BrowserWidth = BrowserWidth; 
      this.m_BrowserHeight = BrowserHeight; 
      this.m_ThumbnailHeight = ThumbnailHeight; 
      this.m_ThumbnailWidth = ThumbnailWidth; 
     } 

     private string m_Url = null; 
     public string Url 
     { 
      get 
      { 
       return m_Url; 
      } 
      set 
      { 
       m_Url = value; 
      } 
     } 

     private Bitmap m_Bitmap = null; 
     public Bitmap ThumbnailImage 
     { 
      get 
      { 
       return m_Bitmap; 
      } 
     } 

     private int m_ThumbnailWidth; 
     public int ThumbnailWidth 
     { 
      get 
      { 
       return m_ThumbnailWidth; 
      } 
      set 
      { 
       m_ThumbnailWidth = value; 
      } 
     } 

     private int m_ThumbnailHeight; 
     public int ThumbnailHeight 
     { 
      get 
      { 
       return m_ThumbnailHeight; 
      } 
      set 
      { 
       m_ThumbnailHeight = value; 
      } 
     } 

     private int m_BrowserWidth; 
     public int BrowserWidth 
     { 
      get 
      { 
       return m_BrowserWidth; 
      } 
      set 
      { 
       m_BrowserWidth = value; 
      } 
     } 

     private int m_BrowserHeight; 
     public int BrowserHeight 
     { 
      get 
      { 
       return m_BrowserHeight; 
      } 
      set 
      { 
       m_BrowserHeight = value; 
      } 
     } 

     public Bitmap GenerateWebSiteThumbnailImage() 
     { 
      Thread m_thread = new Thread(new ThreadStart(_GenerateWebSiteThumbnailImage)); 
      m_thread.SetApartmentState(ApartmentState.STA); 
      m_thread.Start(); 
      m_thread.Join(); 
      return m_Bitmap; 
     } 

     private void _GenerateWebSiteThumbnailImage() 
     { 
      WebBrowser m_WebBrowser = new WebBrowser(); 
      m_WebBrowser.ScrollBarsEnabled = false; 
      m_WebBrowser.Navigate(m_Url); 
      m_WebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted); 
      while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete) 
       Application.DoEvents(); 
      m_WebBrowser.Dispose(); 
     } 

     private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) 
     { 
      WebBrowser m_WebBrowser = (WebBrowser)sender; 
      m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth, this.m_BrowserHeight); 
      m_WebBrowser.ScrollBarsEnabled = false; 
      m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height); 
      m_WebBrowser.BringToFront(); 
      m_WebBrowser.DrawToBitmap(m_Bitmap, m_WebBrowser.Bounds); 
      m_Bitmap = (Bitmap)m_Bitmap.GetThumbnailImage(m_ThumbnailWidth, m_ThumbnailHeight, null, IntPtr.Zero); 
     } 
    } 
} 

Answer 2

您還可以簡單地使用1000個Web服務之一：

http://www.websnapr.com/

http://www.thumbalizr.com/

http://snapcasa.com/

http://thumbnails.iwebtool.com/

http://www.artviper.com/tools.php#thumbnails