ASP. NET implements the method of generating web page thumbnails Based on URLs. asp.net thumbnails

ASP. NET implements the method of generating web page thumbnails Based on URLs. asp.net thumbnails

This example describes how to generate Web page thumbnails Based on URLs using ASP. NET. We will share this with you for your reference. The details are as follows:

You need to use the URL-based page thumbnails function to prepare in advance.

I found the source code on the Internet, but there is an error: the current thread is not in a single thread unit, so the ActiveX Control "8856f961-340a-11d0-a9" cannot be instantiated. After the solution is completed, it runs well and is recorded here for backup!

Start page: Default. aspx

<% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "Default. aspx. cs" Inherits = "CaptureToImage. _ Default" %> <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
Call page: Snap. aspx
<% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "Snap. aspx. cs" Inherits = "CaptureToImage. Snap" AspCompat = "true" %> <! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
PS: The red font is the code added to solve the error and forces the program to run in a single-threaded environment!
Call page: Snap. aspx. cs
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.Drawing.Imaging;namespace CaptureToImage{ public partial class Snap : System.Web.UI.Page {  protected void Page_Load(object sender, EventArgs e)  {   string url = string.Empty;   url = Request.QueryString[0];   try   {    GetImage thumb = new GetImage(url, 1024, 768, 800, 600);    System.Drawing.Bitmap x = thumb.GetBitmap();    x.Save(Response.OutputStream, ImageFormat.Jpeg);    Response.ContentType = "image/jpeg";   }   catch (Exception ex)   {    Response.Write(ex.Message);   }  } }}
Class file: GetImage. cs
using System;using System.Drawing;using System.Drawing.Imaging;using System.Windows.Forms;using System.Web.UI;namespace CaptureToImage{ public class GetImage {  int S_Height;  int S_Width;  int F_Height;  int F_Width;  string MyURL;  public int ScreenHeight  {   get   {    return S_Height;   }   set   {    S_Height = value;   }  }  public int ScreenWidth  {   get   {    return S_Width;   }   set   {    S_Width = value;   }  }  public int ImageHeight  {   get   {    return F_Height;   }   set   {    F_Height = value;   }  }  public int ImageWidth  {   get   {    return F_Width;   }   set   {    F_Width = value;   }  }  public string WebSite  {   get   {    return MyURL;   }   set   {    MyURL = value;   }  }  public GetImage(string WebSite, int ScreenWidth, int ScreenHeight, int ImageWidth, int ImageHeight)  {   this.WebSite = WebSite;   this.ScreenHeight = ScreenHeight;   this.ScreenWidth = ScreenWidth;   this.ImageHeight = ImageHeight;   this.ImageWidth = ImageWidth;  }  [STAThread]  public Bitmap GetBitmap()  {   WebPageBitmap Shot = new WebPageBitmap(this.WebSite, this.ScreenWidth, this.ScreenHeight);   Shot.GetIt();   Bitmap Pic = Shot.DrawBitmap(this.ImageHeight, this.ImageWidth);   return Pic;  } } public class WebPageBitmap {  WebBrowser MyBrowser;  string URL;  int Height;  int Width;  public WebPageBitmap(string url, int width, int height)  {   this.URL = url;   this.Width = width;   this.Height = height;   MyBrowser = new WebBrowser();   MyBrowser.ScrollBarsEnabled = false;   MyBrowser.Size = new Size(this.Width, this.Height);  }  public void GetIt()  {   NavigateUrl(this.URL);   while (MyBrowser.ReadyState != WebBrowserReadyState.Complete)   {    Application.DoEvents();   }  }  public delegate void DelUserHandler(string url);  public void NavigateUrl(string url)  {   try   {    if (this.MyBrowser.InvokeRequired)    {     DelUserHandler handler = new DelUserHandler(NavigateUrl);     MyBrowser.Invoke(handler, url);    }    else    {     this.MyBrowser.Navigate(url);    }   }   catch (Exception ex)   {    throw new Exception("NavigateUrl()" + ex.Message);   }  }  public Bitmap DrawBitmap(int theight, int twidth)  {   Bitmap myBitmap = new Bitmap(this.Width, this.Height);   Rectangle DrawRect = new Rectangle(0, 0, this.Width, this.Height);   MyBrowser.DrawToBitmap(myBitmap, DrawRect);   System.Drawing.Image imgOutput = myBitmap;   System.Drawing.Bitmap oThumbNail = new Bitmap(twidth, theight, imgOutput.PixelFormat);   Graphics g = Graphics.FromImage(oThumbNail);   g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;   g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;   g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;   Rectangle oRectangle = new Rectangle(0, 0, twidth, theight);   g.DrawImage(imgOutput, oRectangle);   try   {    return oThumbNail;   }   catch   {    return null;   }   finally   {    imgOutput.Dispose();    imgOutput = null;    MyBrowser.Dispose();    MyBrowser = null;   }  } }}
PS: Add reference System. Windows. Forms to the Project
I hope this article will help you design your asp.net program.