SUJOY SANTRA: Resize Image

ASPX Page
-------------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Generate a Thumbnails from Uploaded Image</title>
<script type="text/javascript" src="lightbox.js"></script>
<link href="lightbox.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div>
Height :
    <asp:TextBox ID="txtHeight" runat="server"></asp:TextBox>
    Weidth :
    <asp:TextBox ID="txtWeidth" runat="server"></asp:TextBox>
    <br />
<asp:FileUpload ID="fileupload1" runat="server" />
<asp:Button ID="btnsave" runat="server" Text="Upload" onclick="btnsave_Click" />
</div>
<div>
<asp:DataList ID="dtlist" runat="server" RepeatColumns="3" CellPadding="5">
<ItemTemplate>
<asp:Image ID="Image1" ImageUrl='<%# Bind("Name", "~/Images/{0}") %>' runat="server" Height="180px" Width="160px"/>
<br />
<asp:HyperLink ID="HyperLink1" Text='View' style="text-decoration:none" rel="lightbox" Target="_blank" NavigateUrl='<%# Bind("Name", "~/Images/{0}") %>' runat="server"/>
</ItemTemplate>
<ItemStyle BorderColor="Brown" BorderStyle="dotted" BorderWidth="3px" HorizontalAlign="Center"
VerticalAlign="Bottom" />
</asp:DataList>
</div>
</form>
</body>
</html>

CS Page
---------
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

using System.Collections;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindDataList();
        }
    }
    protected void BindDataList()
    {
        DirectoryInfo dir = new DirectoryInfo(MapPath("Images"));
        FileInfo[] files = dir.GetFiles();
        ArrayList listItems = new ArrayList();
        foreach (FileInfo info in files)
        {
            listItems.Add(info);
        }
        dtlist.DataSource = listItems;
        dtlist.DataBind();

    }
    protected void btnsave_Click(object sender, EventArgs e)
    {

        string filename = Path.GetFileName(fileupload1.PostedFile.FileName);
        string targetPath = Server.MapPath("Images/" +System.DateTime.Now.ToString("yyyyMMddhhmmss")+"_"+filename);
        Stream strm = fileupload1.PostedFile.InputStream;
        var targetFile = targetPath;
        //Based on scalefactor image size will vary
        GenerateThumbnails(0.5, strm, targetFile);
        BindDataList();
    }
    private void GenerateThumbnails(double scaleFactor, Stream sourcePath, string targetPath)
    {
        using (var image = System.Drawing.Image.FromStream(sourcePath))
        {
            //var newWidth = (int)(image.Width * scaleFactor);
            //var newHeight = (int)(image.Height * scaleFactor);

            var newWidth = Convert.ToInt32(this.txtWeidth.Text.Trim());
            var newHeight = Convert.ToInt32(this.txtHeight.Text.Trim());
            var thumbnailImg = new Bitmap(newWidth, newHeight);
            var thumbGraph = Graphics.FromImage(thumbnailImg);
            thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
            thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
            thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
            var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
            thumbGraph.DrawImage(image, imageRectangle);
            thumbnailImg.Save(targetPath, image.RawFormat);
        }
    }
}

SUJOY SANTRA

Sunday 21 July 2013

Resize Image

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