Click here to Skip to main content
Click here to Skip to main content
Go to top

Get ASP.NET C# 2.0 Website Thumbnail Screenshot

, 22 Jul 2010
Rate this:
Please Sign up or sign in to vote.
How to get a Website/URL thumbnail/screenshot with C#.NET 2.0 in VS 2005.

screenshot.JPG

Sample application screenshot

Introduction

This sample code/website gets the thumbnail/screenshot for a specific URL, giving the browser dimensions and the thumbnail dimensions you want.

Background

Well, tired of search for a method for giving me the screenshot of a URL, and just finding examples of Windows.Forms, with the simple method DrawToBitmap, I just realized that in ASP.NET, that does not work like that, because of Single Thread and Multi Thread; so I used .SetApartmentState(ApartmentState.STA) to make it single threaded.

Using the Code

Just call the method that you want to associate with the ImageUrl of an ASP.NET Image control.

Server-side

Calling with the IHttpHandler Method

ImageBox.ImageUrl = "~/HandlerWSThumb.ashx?url=" + 
   Server.UrlEncode(txtURL.Text).ToLower().ToString() + "&bw=" + 
   txtBW.Text + "&bh=" + txtBH.Text + "&tw=" + 
   txtTW.Text + "&th=" + txtTH.Text;

Calling with the Class Method

Bitmap bmp = ClassWSThumb.GetWebSiteThumbnail(txtURL.Text, Int32.Parse(txtBW.Text), 
             Int32.Parse(txtBH.Text), Int32.Parse(txtTW.Text), 
             Int32.Parse(txtTH.Text));
bmp.Save(Server.MapPath("~") + "/thumbnail.bmp");
ImageBox.ImageUrl = "~/thumbnail.bmp";

//**if Jpeg is the image format you need just replace the 2 lines above for:
//
//bmp.Save(Server.MapPath("~") + "/thumbnail.jpg", ImageFormat.Jpeg);
//ImageBox.ImageUrl = "~/thumbnail.jpg";

//** but don't forget to add the reference
//   to the class in the page 'Default.aspx'(code behind):
//using System.Drawing.Imaging;

Here is the class method code:

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
using System.IO;

namespace GetWebSiteThumb
{
    public class ClassWSThumb
    {
        public static Bitmap GetWebSiteThumbnail(string Url, int BrowserWidth, 
               int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)
        {
            return new WSThumb(Url, BrowserWidth, BrowserHeight, 
                   ThumbnailWidth, ThumbnailHeight).GetWSThumb();
        }

        private class WSThumb
        {
            public WSThumb(string Url, int BW, int BH, int TW, int TH) {
                __Url = Url;
                __BrowserWidth = BW;
                __BrowserHeight = BH;
                __ThumbnailWidth = TW;
                __ThumbnailHeight = TH;
            }

            private Bitmap __Bitmap = null;            
            private string __Url = null;
            private int __ThumbnailWidth;
            private int __ThumbnailHeight;
            private int __BrowserWidth;
            private int __BrowserHeight;

            public string Url            {
                get{return __Url;}
                set{__Url = value;}
            }
            
            public Bitmap ThumbnailImage            {
                get{return __Bitmap;}
            }

            public int ThumbnailWidth            {
                get{return __ThumbnailWidth;}
                set{__ThumbnailWidth = value;}
            }

            public int ThumbnailHeight            {
                get {return __ThumbnailHeight;}
                set {__ThumbnailHeight = value;}
            }

            public int BrowserWidth            {
                get{return __BrowserWidth;}
                set{__BrowserWidth = value;}
            }

            public int BrowserHeight            {
                get{return __BrowserHeight;}
                set{__BrowserHeight = value;}
            }

            public Bitmap GetWSThumb()            {
                ThreadStart __threadStart = new ThreadStart(_GenerateWSThumb);
                Thread __thread = new Thread(__threadStart);

                __thread.SetApartmentState(ApartmentState.STA);
                __thread.Start();
                __thread.Join();
                return __Bitmap;
            }

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

            private void WebBrowser_DocumentCompleted(object sender, 
                         WebBrowserDocumentCompletedEventArgs e)            {
                WebBrowser __WebBrowser = (WebBrowser)sender;
                __WebBrowser.ClientSize = new Size(this.__BrowserWidth, this.__BrowserHeight);
                __WebBrowser.ScrollBarsEnabled = false;
                __Bitmap = new Bitmap(__WebBrowser.Bounds.Width, __WebBrowser.Bounds.Height);
                __WebBrowser.BringToFront();
                __WebBrowser.DrawToBitmap(__Bitmap, __WebBrowser.Bounds);
                
                if (__ThumbnailHeight != 0 && __ThumbnailWidth !=0)
                __Bitmap = (Bitmap)__Bitmap.GetThumbnailImage(
                    __ThumbnailWidth, __ThumbnailHeight, null, IntPtr.Zero);                
            }
        }
    }
}

Here is the IHTTPHandler method code:

using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Threading;
using System.IO;
using System.Reflection;

namespace GetWebSiteThumb
{
    /// <summary>
    /// Summary description for $codebehindclassname$
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class HandlerWSThumb : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            Bitmap thumb = null;
            string url = null;
            int bw = 800; //valor por defeito
            int bh = 600; //valor por defeito
            int tw = 0;    // sem thumbnail 
            int th = 0;

            context.Response.ContentType = "image/jpeg";
            if (context.Request["url"] != null)
            {
                if (context.Request["url"].ToString().ToLower().Contains("http://") || 
                       context.Request["url"].ToString().ToLower().Contains("https://"))
                    url = context.Request["url"].ToString();
                else
                    url = "http://" + context.Request["url"].ToString();
            }

            if (context.Request["bw"] != null)
                bw = Int32.Parse(context.Request["bw"].ToString());

            if (context.Request["bh"] != null)
                bh = Int32.Parse(context.Request["bh"].ToString());

            if (context.Request["tw"] != null)
                tw = Int32.Parse(context.Request["tw"].ToString());

            if (context.Request["th"] != null)
                th = Int32.Parse(context.Request["th"].ToString());

            // return context bitmap
            thumb = GetWebSiteThumbnail(url, bw, bh);

            if (tw != 0 && th != 0)
                thumb.GetThumbnailImage(tw, th, null, IntPtr.Zero).Save(
                           context.Response.OutputStream, ImageFormat.Jpeg);
            else
                thumb.Save(context.Response.OutputStream, ImageFormat.Jpeg);

            thumb.Dispose();
        }

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

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

            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_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);
            }
        }

        // Resusable flag
        public bool IsReusable
        {
            get { return false; }
        }
    }
}

Points of Interest

I learn that there are always three ways to do things: the right way, the wrong way, and the best way. I tried to cover the 3 of them Wink | ;) As an add-on, you could build a WebService method for returning the thumbnail. Maybe I will edit this article in the near future and put some code in the sample to accomplish it.

History

  • Version 1.0: Upgrades and tips are welcome.
  • Version 1.1: Just added a comment about converting the resulting BMP in the class method to JPEG, after a user asked me to do that.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

Gilberto Francisco
Web Developer Microsky
Portugal Portugal
Software developer since 1986, as a hobby
and since 1998 as a professional
 
Currently working for Ogilvy S.A.
(Advertinsing media in portugal)

Comments and Discussions

 
QuestionThanks bro! PinmemberMember 923658523-Jun-14 5:39 
GeneralNice Solution! Pinmemberjohnh12325-Apr-14 8:40 
QuestionUnable to get google screenshot when project is deployed on IIS PinmemberAbid Sayed9-Sep-13 18:57 
AnswerRe: Unable to get google screenshot when project is deployed on IIS PinmemberGilberto Francisco5-Feb-14 10:13 
GeneralMy vote of 3 Pinmemberref99715-Jan-13 2:24 
GeneralMy vote of 5 PinmemberSavalia Manoj M30-Dec-12 21:52 
Questionwant to capture entire webpage with scrollbar PinmemberGaurav Mishra29-Nov-12 2:54 
AnswerRe: want to capture entire webpage with scrollbar PinmemberGilberto Francisco29-Nov-12 3:37 
Questionnot working for dynamic webpages Pinmemberroopali@241127-Aug-12 3:30 
NewsWorks well, Vote 5 PinmemberDadajiIn15-Jun-12 0:30 
Suggestionsome suggestions PinmemberMember 43531606-Apr-12 0:56 
QuestionAwesome article PinmemberTanzeelurRehman13-Mar-12 7:59 
GeneralI managed to convert the class ClassWSThumb in vb.net. and the usage of it in any click button event [modified] Pinmembertemhz14-Dec-11 6:33 
QuestionIt can't change the Image name . [modified] PinmemberHatef Ghaniyarlou10-Aug-11 4:49 
I Used this code :
 
string  GuidedName = Guid.NewGuid();
            bmp.Save(Server.MapPath("~") + "/"  + GuidedName, ImageFormat.Jpeg);
            ImageBox.ImageUrl = "~/"  + GuidedName;
 
or
 
string  GuidedName = Guid.NewGuid();
            bmp.Save(Server.MapPath("~") + "/"  + GuidedName+"jpg", ImageFormat.Jpeg);
            ImageBox.ImageUrl = "~/"  + GuidedName+"jpg";
 

and I use your own code that you said in article but it's not working .
 
it can't generate .jpeg file .

modified on Wednesday, August 10, 2011 11:03 AM

AnswerRe: It can't change the Image name . [modified] Pinmembermoshman0811-Nov-11 7:52 
GeneralMy publish code not working PinmemberNibeditaJena13-Apr-11 1:18 
QuestionVB.net ? PinmemberMember 777093220-Mar-11 20:25 
Generaldoes not work PinmemberOmar Gamil14-Mar-11 3:12 
GeneralRe: does not work PinmemberGilberto Francisco14-Mar-11 4:55 
GeneralRe: does not work PinmemberOmar Gamil14-Mar-11 4:59 
GeneralRe: does not work PinmemberGilberto Francisco14-Mar-11 5:05 
GeneralRe: does not work PinmemberOmar Gamil14-Mar-11 5:07 
GeneralRe: does not work PinmemberGilberto Francisco14-Mar-11 5:44 
GeneralRe: does not work PinmemberOmar Gamil14-Mar-11 9:22 
Generalportability Pinmemberabhishek_mys0524-Jan-11 20:05 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Mobile
Web04 | 2.8.140916.1 | Last Updated 22 Jul 2010
Article Copyright 2010 by Gilberto Francisco
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid