Hello Everyone,
I'm pretty new to CF so please bear with my ignorance...

I'm trying to use captcha to verify user comments within a cfdiv.
The problem I have is that if I give the cfimage tag a static destination ("captcha.jpg"), then the image gets cached and doesn't update to reflect the new verification string.

Now, I could give it a dynamic name, but then I'd wind up with a folder full of captcha images.
I though I could just leave out the destination attribute and use the tmpCache folder, but it's a shared host so no can do.

So, unless someone has any other ideas, I guess what I need to know is how to create my own temp folder that will empty itself out, like the tmpcache folder.

Any ideas?

You don't need to worry about writing the captcha to disk. CF8's built in captcha functionality via <cfimage> can stream the captcha image right the the browser, so there is no storage necessary.

Ray Camden has a good write up and example code you can use.

http://www.coldfusionjedi.com/index.cfm/2008/3/29/Quick-and-Dirty-ColdFusion-8-CAPTCHA-Guide

The CF8 captcha is great, but make sure you delete the images later, otherwise you will have all the captcha files in your folder.

Thanks. Looks like I just needed my sandbox settings adjusted, but I didn't explain the problem to support very well the first time.