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<%@ page language="c#" masterpagefile="~/tpl/Demo.Master" inherits="NewOnline.ToPdf, App_Web_tuwfkfry" title="Generate Barcode and Insert Generated Image(s) in Multi-page TIFF Image" %>
<%@ Register TagPrefix="cc1" Namespace="Aspose.BarCode.Web.UI" Assembly="Aspose.BarCode" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<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" style="text-align: left">Generate Barcode and Insert Generated Image(s) in Multi-page TIFF Image</h2></td>
    <td width="19"><img src="/Common/images/heading_rt.jpg" alt="" width="19" height="41" /></td>
  </tr>
</table>
<br />
<p class="componentDescriptionTxt" style="text-align: left">
In this online demo, you can generate the barcode by setting the codetext and selecting the symbology type.
The barcode will be generated and inserted into a multi-page TIFF image.
For each generated barcode, a new page in multi-page TIFF image will be created.<br/><br/>For more details please see the following topics:
</p>

<ul>
    <li style="text-align: left">
    <a href="http://www.aspose.com/documentation/.net-components/aspose.barcode-for-.net/set-code-text-for-barcode.html">Set Code Text for Generating BarCode Images</a>
  </li>
  <li style="text-align: left">
    <a href="http://www.aspose.com/documentation/.net-components/aspose.barcode-for-.net/save-barcode-image-to-streams.html">Generate BarCode Image and Save to Memory Stream</a>
  </li>
</ul>
<p></p>
<table id="Table1" class="genericTable">
	<tr>
		<td style="WIDTH: 118px">Code Text:
		</td>
		<td align="left">
			<asp:textbox id="txtCode" runat="server" Width="160px">01234567890</asp:textbox>&nbsp;<asp:RequiredFieldValidator 
                ID="reqCodetext" runat="server" ControlToValidate="txtCode" 
                ErrorMessage="Please specify the Codetext value">*</asp:RequiredFieldValidator>
        </td>
	</tr>
	<tr>
		<td style="WIDTH: 118px">Symbology:
		</td>
		<td align="left">
			<asp:DropDownList ID="ddlSymbology" runat="server">
            </asp:DropDownList>
		</td>
	</tr>
	<tr>
		<td style="WIDTH: 118px">
			<asp:button id="btnSet0" runat="server" Width="160px" 
                Text="Add New Barcode" onclick="btnSet_Click1"></asp:button>
            <br />
			<asp:button id="btnSet1" runat="server" Width="160px" 
                Text="Remove Selected" onclick="btnSet_Click" CausesValidation="False"></asp:button>
		</td>
		<td align="left">
			<asp:ListBox ID="lstCodetext" runat="server">
                <asp:ListItem Value="Code128">test-code128</asp:ListItem>
                <asp:ListItem Value="Code39Standard">test-code39</asp:ListItem>
            </asp:ListBox>
		</td>
	</tr>
	<tr>
		<td colspan="2">
            <asp:button id="btnOutput" runat="server" Width="188px" 
                    Text="Generate Multi-page TIFF" onclick="btnOutput_Click1" 
                CausesValidation="False"></asp:button>
        </td>
	</tr>
	
	<tr>
		<td align="left" colspan="2">
			<asp:ValidationSummary ID="ValidationSummary1" runat="server" />
        </td>
	</tr>
	
</table>
</asp:Content>

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using System.Collections.Specialized;
using System.Drawing.Imaging;
using System.IO;
using System.Web.UI;
using Aspose.BarCode;
using Aspose.BarCode.Web.UI;
using Aspose.Pdf;

namespace NewOnline
{
    using System;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;
    public partial class ToPdf : Page
    {
        // Fields
        
        /// <summary>
        /// Generate the pdf file and send it to user'd disk
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnOutput_Click(object sender, EventArgs e)
        {
            if (lstCodetext.Items.Count == 0)
                return;
            
            // for each item in the listbox, generate separate barcode image as stream
            // and save image stream in the array
            MemoryStream[] imgStream = new MemoryStream[lstCodetext.Items.Count];
            int i = 0;
            foreach (ListItem item in lstCodetext.Items)
            {
                // get the codetext and symbology from the listbox
                string strCodetext = item.Text;
                Symbology symbology = (Symbology)Enum.Parse(typeof(Symbology), item.Value);

                // generate the barcode
                BarCodeBuilder builder = new BarCodeBuilder(strCodetext, symbology);
                imgStream[i] = new MemoryStream();
                builder.Save(imgStream[i], ImageFormat.Png);
                i++;
            }

            
            // save the images from stream array to TIFF
            //If only one page in the collection, convert the stream to bitmap and copy directly
            if (imgStream.Length == 1)
            {
                Response.Clear();
                Response.ContentType = "image";
                Bitmap singleBitmap = new Bitmap(imgStream[0]);
                singleBitmap.Save(Response.OutputStream, ImageFormat.Tiff);
                Response.End();
                return;
            }

            Response.Clear();
            Response.ContentType = "image/tiff";
            
            // use the save encoder flag
            Encoder enc = Encoder.SaveFlag;

            // declare encode parameters for multipage and compresstion
            EncoderParameters ep = new EncoderParameters(2);
            ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.MultiFrame);
            ep.Param[1] = new EncoderParameter(Encoder.Compression, (long)EncoderValue.CompressionLZW);

            // initialize pages with null
            Bitmap pages = null;
            int frame = 0;

            // get the encoder info
            ImageCodecInfo info = GetEncoderInfo("image/tiff");

            // add pages in the tiff file
            foreach (MemoryStream imageStream in imgStream)
            {
                // first page
                if (frame == 0)
                {
                    pages = new Bitmap(imageStream);

                    // save the first frame
                    pages.Save(Response.OutputStream, info, ep);
                }
                else
                {
                    // save the intermediate pages
                    ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.FrameDimensionPage);

                    Bitmap bm = new Bitmap(imageStream);
                    pages.SaveAdd(bm, ep);
                }

                if (frame == imgStream.Length - 1)
                {
                    // flush and close.
                    ep.Param[0] = new EncoderParameter(enc, (long)EncoderValue.Flush);
                    pages.SaveAdd(ep);
                }

                frame++;
            }

            Response.End();
        }

        /// <summary>
        /// Getting the supported codec info.
        /// </summary>
        /// <param name="mimeType">description of mime type</param>
        /// <returns>image codec info</returns>
        private ImageCodecInfo GetEncoderInfo(string mimeType)
        {
            ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
            for (int j = 0; j < encoders.Length; j++)
            {
                if (encoders[j].MimeType == mimeType)
                    return encoders[j];
            }

            throw new Exception(mimeType + " mime type not found in ImageCodecInfo");
        }

        protected void btnSet_Click(object sender, EventArgs e)
        {
            if (lstCodetext.SelectedIndex == -1)
            {
                return;
            }
            else
            {
                lstCodetext.Items.RemoveAt(lstCodetext.SelectedIndex);
            }
        }

        private void InitializeComponent()
        {
            //this.btnSet.Click += new EventHandler(this.btnSet_Click);
            this.btnOutput.Click += new EventHandler(this.btnOutput_Click);
            base.Load += new EventHandler(this.Page_Load);
        }

        protected override void OnInit(EventArgs e)
        {
            this.InitializeComponent();
            base.OnInit(e);

            LoadSymbologies();
            LoadImageQuality();
        }

        private void LoadImageQuality()
        {
            Array arrImageQuality = Enum.GetValues(typeof(ImageQualityMode));
            
        }

        private void LoadSymbologies()
        {
            Array arrSymbologies = Enum.GetValues(typeof(Symbology));
            ddlSymbology.DataSource = arrSymbologies;
            ddlSymbology.DataBind();
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            // initialize the barcode control when the page is loaded for the first time
            if (!base.IsPostBack)
            {
                ddlSymbology.SelectedValue = Symbology.Code128.ToString();
            }
        }
        protected void btnSet_Click1(object sender, EventArgs e)
        {
            if (Page.IsValid == false)
                return;
            lstCodetext.Items.Add(new ListItem(txtCode.Text, ddlSymbology.SelectedValue));
        }
        protected void btnOutput_Click1(object sender, EventArgs e)
        {

        }
}


}