Oh, btw, guys. This is not the first time I get this question. If
someone would like to write it up and put it on the wiki, that would
be great!
On 06 May 2006, at 04:13, Geert Bevin wrote:
Hi David,
this is not possible as an embedded element, since you can't embed
the actual content of a PNG image inside HTML text. You'll first
have to write an embedded element that outputs the <img src="..." /
> tag. After that you'll have to write an element that handles the
response to src="..." attribute. I encourage you to not hard-code
the URL of the src attribute, but detect the URL of the image URL:
getSite().resolveId("PngImageElement", getElementInfo()).getUrl()
The very above looks it up relative to the current element, you can
also look it up absolutely, like this:
getSite().resolveId(".Pub.Binary.PngImageElement").getUrl()
The relative one is better though. Just a small note (which you
maybe don't know), dots separate the sub-sites, and '^' goes one
level up. So consider your current element's ID is
'.Pub.Portal.PngImage' and you want the refer relatively to the
image element, you'll write '^^Binary.PngImageElement'.
That image element is very servlet-like. If your content-type is
fixed (ie. always png), set is during the declaration of your
element (contenttype attribute). If it's dynamic, set the
contenttype attribute to "" (empty), and use setContentType("image/
png") inside the element implementation. After doing that, you can
obtain the binary OutputStream with getOutputStream() and stream
anything through it.
Hope this helps,
Geert
On 05 May 2006, at 19:10, David Herbert wrote:
Hello,
I wonder whether there is provision in RIFE for an element which
writes out content as a binary stream e.g. a PNG image
representing a graph or chart created with a charting package? I
can create a page with an embedded element which creates the
chart, I'm just stuck as to how to output the PNG data using RIFE
functionality. I know how to do this using HttpServletResponse e.g:
BufferedImage image = ImageIO.read( url );
response.setContentType( "png" );
ImageIO.write( image, "png", out );
However I don't think this is right here - anyone point me in the
right direction?
Thanks,
David Herbert.
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