Vista - Re: Handling Large Numbers of Files

I would consider using a hash table to collect all the files in the archive
dir. Comparing large arrays would be very slow. If you use a hash table
then you can use a very quick key test to see if the file you are processing
exists in the archive dir:

# First populate the hashtable with all the file names in the archive dir
$archive = @{}; gci . -r | ?{!$_.PSIsContainer} |
%{$archive[$_.name]=(Get-Hash $_)}

Then you have two options for testing. Simple:

if ($archive[$sourceFile.name]) { .... }

or to see if two files are really the same and not just named the same:

$hash = Get-Hash $sourceFile
if ($archive[$sourceFile.name].HashString -eq $hash) { .... }

Note that Get-Hash is from the PowerShell Community Extensions.

--
Keith
http://www.codeplex.com/powershellcx


"Michael Powe" <michael+gnus@xxxxxx> wrote in message
news:87k5ahgq6d.fsf@xxxxxx

Mmm data parsing the file system
and data parsing files!

Perhaps try Microsoft's IIS (local or remote)
data parser, Log Parser 2.2.

Log Parser runs in almost any Windows process,
even within the Windows admin's automation tool,
(now GUI based) powershell.exe.

For more help, ask any PowerShell user or MVP or
any IIS user or MVP (where Log Parser comes from,
notice that there is no need to have IIS installed in
order to use Log Parser within the Windows admin's
automation tool, powershell.exe) or just perhaps:

LogParser.exe -h

Have fun data parsing
within powershell.exe!