Re: Image resizer control

ervipingupta — Wed, 01 Jul 2009 07:04:44 GMT

Hi Friend,

Can you told me how to resize the Animated image ???

Image resizer control

Ajes — Fri, 11 Apr 2008 10:38:59 GMT

Hey people,

I have this Custom Server Control.

"C#" Class="ShowImage" %>

using System;
using System.Web;
using System.Data.Odbc;
using System.Data;
using System.IO;
using System.Drawing;

public class ShowImage : IHttpHandler
{
    const int BUFFERSIZE = 1024;

    public bool IsReusable
    {
        get
        {
            return true;
        }
    }

    public void ProcessRequest(HttpContext context)
    {
        Byte[] imgBytes = null;
        context.Response.ContentType = "image/jpeg";
        String url = Utils.Decrypt(HttpUtility.UrlDecode(context.Request.QueryString.ToString()));
        String[] arguments = url.Split(new char[] { '&' });

        String imagePath = arguments[0];
        String width = arguments[1];
        String height = arguments[2];
        String cacheKey = "image=" + imagePath+";width="+width+";height="+height;
        Object cachedImageBytes = context.Cache.Get(cacheKey);

        if (cachedImageBytes != null)
        {
            imgBytes = (Byte[])cachedImageBytes;
        }
        else
        {
            context.Response.BufferOutput = false;
            imgBytes = writeSingleImage(imagePath, Convert.ToInt32(width), Convert.ToInt32(height));
            
            try
            {
                context.Cache.Insert(cacheKey, imgBytes, null, DateTime.Now.AddDays(14), System.Web.Caching.Cache.NoSlidingExpiration);
            }
            catch
            {
                //just ignore, dont know what happens
            }
        }

        if (imgBytes != null)
        {
            context.Response.OutputStream.Write(imgBytes, 0, imgBytes.Length);
        }
        context.Response.End();
    }

    public Byte[] writeSingleImage(String ImagePath, int width, int height)
    {
        Byte[] returnImage = null;
        Bitmap origImage;
        MemoryStream m = new MemoryStream();
        String filePath;

        filePath = HttpContext.Current.Server.MapPath(ImagePath);
        if(!File.Exists(filePath))
        {
            filePath = HttpContext.Current.Server.MapPath("images/no_pix.jpg");
        }
     
        try
        {
            origImage = new Bitmap(filePath);
            origImage.Save(m, System.Drawing.Imaging.ImageFormat.Jpeg);
            origImage.Dispose();

            returnImage = ImageUtils.resizeImage(m.GetBuffer(), width, height);
        }
        catch
        {   
        }
        return returnImage;
    }
}

Now this all work great, but i am using this a lot of places and are working on creating a Class Library with all the controls i often use. This way i can deploy a dll with changes. Does anybody know how i should create a Web Server Control in a class library from the above code. I have created a class that inherits System.Web.UI.WebControl.WebControl, but when i try to write a resized image to the outputstream, all the pages displays is unicode chars. I used this code to write the image to the stream.

Page.Response.ContentType = "image/jpeg";
Page.Response.OutputStream.Write(imgBytes, 0, imgBytes.Length);

Any thoughts??

Custom Server Controls

Re: Image resizer control

Image resizer control