CODEWITHSUNDEEP
c#asp.netasp.net-mvc
GirishK
GirishK

Reputation: 1963

Error when trying to display image by ashx handler - The image “http://localhost:57157/......” cannot be displayed because it contains errors

Here is my code :

HTML : <img src="thumbCreate.ashx?Id=223" alt="asd" />

HTTP Handler : `

public void ProcessRequest (HttpContext context)
    {
        CreateThumbNail(context);
    }
private void CreateThumbNail(HttpContext context)
{
        string resourceId = context.Request.QueryString["Id"];
        context.Response.Write("No resource found for Id = " + resourceId);
        Bitmap original = new Bitmap("C:/Devp/My work/ASHXSampleApp/Images/Desert.jpg");
        int oWidth = original.Width;
        int oHeight = original.Height;

        int preferredWidth = 80;
        int preferredHeight = 100;

        int thumbWidthFactor = oWidth / preferredWidth;
        int thumbHeightFactor = oHeight / preferredHeight;

        int maxFactor = Math.Max(thumbWidthFactor, thumbHeightFactor);

        int thumbNailWidth = oWidth / maxFactor;
        int thumbNailHeight = oHeight / maxFactor;
        Bitmap thumbNailImage = (Bitmap)original.GetThumbnailImage(thumbNailWidth, thumbNailHeight, ThumbNailCallback, IntPtr.Zero);


        context.Response.ContentType = "image/Jpeg";
        thumbNailImage.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);


}`

But this code does not display image. When I manually try to run the handler in firefox, it gives me an error : - "The image “http://localhost:57157/ASHXSampleApp/thumbCreate.ashx?Id=223” cannot be displayed because it contains errors." Any idea?

Upvotes: 0

Views: 1434

Answers (2)

Karl-Johan Sj&#246;gren
Karl-Johan Sj&#246;gren

Reputation: 17522

The problem comes from this part of your code.

string resourceId = context.Request.QueryString["Id"];
context.Response.Write("No resource found for Id = " + resourceId);

You are always adding a string to the response stream and then you write the image data afterwards which will result in a corrupted string. Remove that (or make it conditional so it is added when an error occurs or something) and it should work.

Upvotes: 3

secondflying
secondflying

Reputation: 871

Does context.Response.WriteFile() work?

Upvotes: 0

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