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<%@ Page language="c#" Codebehind="Extract.aspx.cs" AutoEventWireup="false" 
    Inherits="Aspose.Pdf.Kit.Demos.Extract"
    MasterPageFile="~/tpl/Demo.Master"
    Title="Extract Pages from Pdf - Aspose.Pdf.Kit Demos" %>
<asp:Content runat="server" ContentPlaceHolderID="MainContent">

<table width="90%" align="center" cellspacing="0" cellpadding="0" border="0">
  <tr>
    <td width="19"><img src="../../../../Common/images/heading_lft.jpg" alt="" width="19" height="41" /></td>
    <td width="100%" class="demos-heading-bg"><h2 class="demos-heading-bg"> &nbsp;Extract Pages from PDF - Aspose.Pdf.Kit</h2></td>
    <td width="19"><img src="../../../../Common/images/heading_rt.jpg" alt="" width="19" height="41" /></td>
  </tr>
<tr>&nbsp;</tr>
</table>

<p class="MsoNormal"><font size=2 face="Arial" ><span style="color:black" >This demo illustrates how to <b> Extract </b> Pages from a Pdf document, based on user selection.

<br><br>Using <a href=http://www.aspose.com/documentation/.net-components/aspose.pdf.kit-for-.net/aspose.pdf.kit.pdffileeditor.extract_overloads.html> Extract </a> method in <a href=http://www.aspose.com/documentation/.net-components/aspose.pdf.kit-for-.net/aspose.pdf.kit.pdffileeditor.html> PdfFileEditor</a> class of Aspose.Pdf.Kit component, developers can extract any number of pages from a PDF document and save those pages as a new PDF document.

<br><br>
Fore more information, please visit <a href=http://www.aspose.com/documentation/.net-components/aspose.pdf.kit-for-.net/extract-pages-from-a-pdf-document.html>Extract Pages from a PDF Document. </a><br><br><br></span>

    <p class="componentDescriptionTxt">
        Click <b>Extract</b> to see how demo extracts chosen pages from a <a href="./resources/Aspose.Pdf.Kit.pdf">pdf document</a> 
        enabling user to download results.
        </p>
	<asp:Label id="Label2" runat="server" >Pages chosen from Pdf file.</asp:Label><br />
	<asp:CheckBoxList id="CheckBoxList1" CssClass="genericList" 
		runat="server">
		<asp:ListItem Value="1" Selected="True">page 1 of file</asp:ListItem>
		<asp:ListItem Value="2">page 2 of file</asp:ListItem>
		<asp:ListItem Value="3">page 3 of file</asp:ListItem>
		<asp:ListItem Value="4">page 4 of file</asp:ListItem>
		<asp:ListItem Value="5">page 5 of file</asp:ListItem>
	</asp:CheckBoxList>
	<asp:Button id="Button1" runat="server" ToolTip="Click to insert" Text="Extract"></asp:Button>
	&nbsp;pages from Pdf file1 into a new Pdf file.
</asp:Content>

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace Aspose.Pdf.Kit.Demos
{
	/// <summary>
	/// Summary of Extract .
	/// </summary>
	/// 
	public partial class Extract : BasePage
	{
		//protected System.Web.UI.HtmlControls.HtmlGenericControl P1;
		protected System.Web.UI.WebControls.CheckBoxList CheckBoxList1;
		//protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.Button Button1;
		//protected System.Web.UI.HtmlControls.HtmlGenericControl Font1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
		    
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Button1.Click += new System.EventHandler(this.Button1_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Button1_Click(object sender, System.EventArgs e)
		{
			//get number of page chosen from pdf file1
			int[] pages;
			ArrayList pageList = new ArrayList();
			for (int i=0; i<CheckBoxList1.Items.Count; i++)
			{				
				if (CheckBoxList1.Items[i].Selected)
				{
					pageList.Add(i+1);
				}
			}
			if(pageList.Count > 0)
			{
				pages = new int[pageList.Count];
				pageList.CopyTo(pages);
			}
			else
			{
				return;
			}

			//input pdf file from which pages will be extracted
			string inputfile = GetResource("Aspose.Pdf.Kit.pdf");
            
            // create an object of ExtractDemo class
			ExtractDemo extr = new ExtractDemo();
            
            // call extract method of ExtractDemo class to extract pages from inputfile
			extr.Extract(inputfile,pages,Response);
		}
	}
}

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using System;
using System.IO;
using System.Web;
using Aspose.Pdf.Kit;

namespace Aspose.Pdf.Kit.Demos
{
	/// <summary>
	/// Summary of ExtractDemo.
	/// </summary>
	public class ExtractDemo
	{
		public ExtractDemo()
		{
#if SITE_BUILD
			// NOTE that in production you would want to call 
            // new License().SetLicense("path-to-license-file")
            try
            {
	            Aspose.Demos.Common.WebOperationsBridge.InitLicense(new License());
			}catch
			{
				;
			}
#endif
		}

		public void Extract(string inputfile,int[] pages,HttpResponse response)
		{
		//read input Pdf documents
		FileStream inStream = File.Open(inputfile,FileMode.Open,FileAccess.Read,FileShare.Read);

		//new a PdfFileEditor object
		PdfFileEditor pdfEditor = new PdfFileEditor();
		
		//generate new Pdf file output stream.
		MemoryStream outStream = new MemoryStream();
                //Call Extract method of PdfFileEditor object to extract pages from input stream
                pdfEditor.Extract(inStream,pages,outStream);
		// create a byte array that will hold the output pdf
                byte[] outBuf = outStream.GetBuffer();

		// specify the duration of time before a page,cached on a browser expires
		response.Expires = 0;
                // Specify the property to buffer the output page
		response.Buffer = true;
		// Erase any buffered HTML output
                response.ClearContent();
            	//Add a new HTML header and value to the response sent to the client
		response.AddHeader("content-disposition","inline; filename=" + "output.pdf");
            	// Specify the HTTP content type for response as Pdf
		response.ContentType = "application/pdf";
                // Write specified information of current HTTP output to Byte array
		response.BinaryWrite(outBuf);
                // close the output stream
		outStream.Close();	
                //end the processing of the current page to ensure that no other HTML content is sent
		response.End();
		}
	}
}