Neil wrote:
>  -----Original Message-----
>  From: Neil [mailto:neil@[...].com]
>  Sent: Thursday, January 30, 2003 11:43 PM
>  To: perl-win32-users@[...].com
>  Subject: Determing if a file has change ....
>  
>  
>  What is the best way of determing if a file has changed since it was
>  last read ?
>  
>  I have thought about looking at last mod time - but if that was less
>  than one second ago ....
>  
>  Thanks,
>  Neil
>  
>  ----- Original Message -----
>  From: Tillman, James
>  To: 'Neil' ; perl-win32-users@[...].com
>  Sent: Friday, January 31, 2003 5:36 AM
>  Subject: RE: Determing if a file has change ....
>  
>  
>  You might be able to use Win32::ChangeNotify, which works real time
>  on files or entire directories.  It does, however, require that your
>  script be continuously running.  If that's not the case, I'd use last
>  mod time as you suggested.
>  
>  jpt
>  
>  
>  Thanks jpt ... I am familiar with ChangeNotify - but its not really
>  what I want....
>  
>  Basically, I want to open a file, read the contents, and munge the
>  data and write it out to a second file.
>  
>  BUT ... if the original data file changes - I'd like to reparse/remung
>  before writing.
>  
>  Unfortunately, last mod time does not work IF the data was changed
>  twice in the last second.
>  
>  Size doesn't work because a byte chould be changed with no change in
>  size..and twice in the last second.
>  
>  I was hoping that there could be some kind of checksum solution.
>  
>  Thanks,
>  Neil
>  
	You might try MD5 on file which is supposed to give you a checksum
and then after processing, should be able to run again and come up with the
same number. 

	The Perl gurus will let us know if I am off base, but I thought
that's what MD5 did.

Wags ;)


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