Would you be able to compare the date/time of the upload to the date/time of the 'last update' for the file? This could shed some light on whether the file had been opened/re-saved since the upload. (however it would not show if it had been opened and 'not changed', only re-saved.
William -- William E. Seiter Have you ever read a book that changed your life? Go to: www.winninginthemargins.com Enter passkey: goldengrove Web Developer http://William.Seiter.com -----Original Message----- From: Robert Rawlins - Think Blue [mailto:[EMAIL PROTECTED] Sent: Saturday, October 13, 2007 10:46 AM To: CF-Talk Subject: Check File For Change Hello Guys, I've got an application that receives files from an upload form, the user can then come and view/download those files again at a later date. When the file is uploaded I store the basic details, such as the files path and name into a database table, these entries are displayed to the user with a download link, once the link is clicked the file is then served to the client using the cfcontent tag. Now, I'm looking for a method to ensure that the file has not been modified on the file system since the user uploaded it, the chances of it being modified are exceptionally slim, I know, but the consequences of it having happened are quite serious, so I need to be sure. I'm thinking about implementing some form of MD5 check sum on the files, this sum will be saved to the database when the file is uploaded, and checked against a newly generated checksum before the file is served back to the user again. Does that sounds like a fair concept? How severally is it likely to hit performance? Is there a better option? I've also not done any of this MD5 work before, has anyone got any pointers on the best way to handle it? Thanks again, Rob ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| ColdFusion 8 - Build next generation apps today, with easy PDF and Ajax features - download now http://download.macromedia.com/pub/labs/coldfusion/cf8_beta_whatsnew_052907.pdf Archive: http://www.houseoffusion.com/groups/CF-Talk/message.cfm/messageid:291016 Subscription: http://www.houseoffusion.com/groups/CF-Talk/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
