Thanks for that, the:
context.Response.ContentType = "image/jpeg";
bmpThumbnail.Save(context.Response.OutputStream, ImageFormat.Jpeg);
}
Is exactly what I'm after.
Simon.
-----Original Message-----
From: Discussion of advanced .NET topics.
[mailto:[EMAIL PROTECTED] On Behalf Of Efran Cobisi
Sent: 16 October 2006 12:29
To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM
Subject: Re: [ADVANCED-DOTNET] Image Response using ASP.Net
Hi,
The ASP.Net HttpResponse object exposes its underlying output stream,
via the OutputStream property.
You can use this reference to write directly to the output stream from,
among others, any in-memory buffer.
Here's an example of how to build a 100x100 pixels image which, for the
sake of the example, has a yellow background built at runtime and pass
it as output on the fly, inside an http handler:
~~~~~~~~~~~~~~
int iWidth = 100;
int iHeight = 100;
using (Bitmap bmpThumbnail = new Bitmap(iWidth, iHeight)) {
Rectangle rcCanvas = new Rectangle(0, 0, iWidth, iHeight);
using (Graphics grThumbnail = Graphics.FromImage(bmpThumbnail))
{
grThumbnail.FillRectangle(new SolidBrush(Color.Yellow),
rcCanvas);
}
// Output the bitmap data to the http response
context.Response.ContentType = "image/jpeg";
bmpThumbnail.Save(context.Response.OutputStream, ImageFormat.Jpeg);
}
~~~~~~~~~~~~~~
HTH,
Efran Cobisi, cobisi.com
Simon Cansick wrote:
> I'm looking to optimise a web application that produces images on the
> fly.
>
> My server side class has a method that returns a Bitmap object (.Net
> 2, C# Class). When the user requests the page, this method is invoked
> and the generated image is displayed in the response. I do this by
> firstly converting it to Jpeg, writing it to disk, then referencing
> the new Jpeg file using an imageControl on my asp page.
>
> This is a bit clunky, I want to avoid writing to disk. Has anyone got
> any good techniques for writing an image out directly from memory to
> the response?
>
> Thanks for any advice.
>
> Simon James.
>
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