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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