Question

sharepoint IHttpHandler error

Asked by: jackjohnson44

I am getting a web.config file error in sharepoint trying to add an ihttphandler

I also added to my safecontrols
      <SafeControl Assembly="MY.RNET.ImageHandler, Version=1.0.0.0, Culture=neutral, PublicKeyToken=38c82c65bfb6cec0" TypeName="*" Safe="True" />

    <httpHandlers>
      <remove verb="GET,HEAD,POST" path="*" />
      <add verb="GET" type="MY.RNET.ImageHandler, Version=1.0.0.0, Culture=neutral, PublicKeyToken=38c82c65bfb6cec0" path="*.jpg,*.png,*.gif,*.bmp"/>
      <add verb="GET,HEAD,POST" path="*" type="Microsoft.SharePoint.ApplicationRuntime.SPHttpHandler, Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" />





Here is my code
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mime;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace MY.RNET.ImageHandler
{
    class ImageHandler : IHttpHandler
    {
        public ImageHandler()
        {
        }

        public string GetContentType(String path)
        {
            switch (Path.GetExtension(path))
            {
                case ".bmp": return "Image/bmp";
                case ".gif": return "Image/gif";
                case ".jpg": return "Image/jpeg";
                case ".png": return "Image/png";
                default: break;
            }
            return String.Empty;
        }

        public ImageFormat GetImageFormat(String path)
        {
            switch (Path.GetExtension(path).ToLower())
            {
                case ".bmp": return ImageFormat.Bmp;
                case ".gif": return ImageFormat.Gif;
                case ".jpg": return ImageFormat.Jpeg;
                case ".png": return ImageFormat.Png;
                default: return null;
            }
        }

        protected byte[] WatermarkImage(HttpContext context)
        {

            byte[] imageBytes = null;
            if (File.Exists(context.Request.PhysicalPath))
            {
                // Normally you'd put this in a config file somewhere.
                string watermark = "John Doe - © EXAMPLE Company 2007";

                Image image = Image.FromFile(context.Request.PhysicalPath);

                Graphics graphic;
                if (image.PixelFormat != PixelFormat.Indexed && image.PixelFormat != PixelFormat.Format8bppIndexed && image.PixelFormat != PixelFormat.Format4bppIndexed && image.PixelFormat != PixelFormat.Format1bppIndexed)
                {
                    // Graphic is not a Indexed (GIF) image
                    graphic = Graphics.FromImage(image);
                }
                else
                {
                    /* Cannot create a graphics object from an indexed (GIF) image.
                     * So we're going to copy the image into a new bitmap so
                     * we can work with it. */
                    Bitmap indexedImage = new Bitmap(image);
                    graphic = Graphics.FromImage(indexedImage);

                    // Draw the contents of the original bitmap onto the new bitmap.
                    graphic.DrawImage(image, 0, 0, image.Width, image.Height);
                    image = indexedImage;
                }
                graphic.SmoothingMode = SmoothingMode.AntiAlias & SmoothingMode.HighQuality;

                Font myFont = new Font("Arial", 15);
                SolidBrush brush = new SolidBrush(Color.FromArgb(80, Color.White));

                /* This gets the size of the graphic so we can determine
                 * the loop counts and placement of the watermarked text. */
                SizeF textSize = graphic.MeasureString(watermark, myFont);

                // Write the text across the image.
                for (int y = 0; y < image.Height; y++)
                {
                    for (int x = 0; x < image.Width; x++)
                    {
                        PointF pointF = new PointF(x, y);
                        graphic.DrawString(watermark, myFont, brush, pointF);
                        x += Convert.ToInt32(textSize.Width);
                    }
                    y += Convert.ToInt32(textSize.Height);
                }


                using (MemoryStream memoryStream = new MemoryStream())
                {
                    image.Save(memoryStream, GetImageFormat(context.Request.PhysicalPath));
                    imageBytes = memoryStream.ToArray();
                }

            }
            return imageBytes;
        }

        #region IHttpHandler Members

        public bool IsReusable
        {
            get { return false; }
        }

        public void ProcessRequest(HttpContext context)
        {
            context.Response.Clear();
            context.Response.ContentType = GetContentType(context.Request.PhysicalPath);
            byte[] imageBytes = WatermarkImage(context);
            if (imageBytes != null)
            {
                context.Response.OutputStream.Write(imageBytes, 0, imageBytes.Length);
            }
            else
            {
                // No bytes = no image which equals NO FILE. :)  
                // Therefore send a 404 - not found response.
                context.Response.StatusCode = 404;
            }
            context.Response.End();
        }

        #endregion

    }
}

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Asked On
2009-04-13 at 13:08:03ID24318359
Topics

MS SharePoint

,

.NET

,

Microsoft Visual C#.Net

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: deepaknetPosted on 2009-04-14 at 02:33:03ID: 24136276

What is the error that you are getting?

 

by: jackjohnson44Posted on 2009-04-14 at 07:41:48ID: 24138782

Parser Error Message: The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

On the link in my config where I add the handler
      <add verb="GET" type="MY.RNET.ImageHandler, Version=1.0.0.0, Culture=neutral, PublicKeyToken=38c82c65bfb6cec0" path="*.jpg,*.png,*.gif,*.bmp"/>

 

by: MsShadowPosted on 2009-04-15 at 04:37:51ID: 24146847

IIRC if you use sharepoint you can't use httphandler. You gotta use SPHttpHandler.

 

by: jackjohnson44Posted on 2009-04-16 at 09:54:49ID: 24159810

Thanks, can you please explain, I am not following.

20120131-EE-VQP-002

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