Asp. NET implementation of Web page thumbnails based on the URL method _ Practical skills

The example in this article describes the method by which the ASP.net implementation generates a Web page thumbnail based on the URL. Share to everyone for your reference, specific as follows:

Work needs to be used to generate Web page thumbnails based on the URL function, ready in advance.

On the internet to find a source code, but there are errors: the current thread is not in a single-threaded apartment, so the ActiveX control can not instantiate the "8856f961-340a-11d0-a9", resolved to run well after the record in this spare!

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 ">

<%@ 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 part of the code to solve the error increase, forcing the program to run in a single thread 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,);
    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); The public void GetIt () {NavigateUrl (.
   URL);
   while (mybrowser.readystate!= webbrowserreadystate.complete) {application.doevents ();
  } public delegate void Deluserhandler (string url); public void NavigateUrl (string url) {try {if. 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: Need to add references in Project System.Windows.Forms

I hope this article will help you to ASP.net program design.