Coldfusion on the fly image resize

Resizing images on the fly with Coldfusion is easy. While it does put a strain on your server you may have a valid reason for wanting to do this ie not allowing someone to hot link an image?

This works in Coldfusion 8 and Railo ( probably Open BD )

Here is the code:

<br /> <cfset picArray = arrayNew(1) /><br /> <cfset arrayAppend(picArray,"1.jpg") /><br /> <cfset arrayAppend(picArray,"2.jpg") /><br /> <cfset arrayAppend(picArray,"3.jpg") /><br /> <br /> <cfloop array="#picArray#" index="i"><br /> <cfoutput><img src="#i#"/></cfoutput><br /> <cfimage action="read" source="#expandPath('.')#/#i#" name="tempPicture" /><br /> <cfimage action="resize" width="30%" height="30%" source="#tempPicture#" name="smallPicture" /><br /> <cfimage action="writetobrowser" source="#smallPicture#" /><br /> <br /><br /> </cfloop><br />

The temporary files end up here: {cf8root}\tmpCache\CFFileServlet\_cf_image and they are cleared after 5 mins on the next image resize. Railo links the images back to {webContextroot}/WEB-INF/railo/temp/graph/

Here is a demo:
Coldfusion http://cf9.kukiel.net/demos/onflyimageresize/

Railo http://railo.kukiel.net/blog/onflyimageresize/