From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-27T07:33:25+09:00
Subject: Re: Problem using FileUtils to sort JPEG files

> It makes a
> bit more sense to me to check to make sure the dir exist
> while looking  through everything

Consider this: how does ruby determine if a filename is a directory? 
Suppose your directory has 2,000 files in it.  Next, suppose you ask 
ruby if "my_file.jpg" is a directory.  What if ruby first has to look at 
each and every one of those 2,000 files to look for a match with 
filename?  Then if it found a match, ruby had to look at the stats for 
the file to determine if it's a directory.  That would mean that every 
time you ask if a filename is a directory, ruby has to step through 
every one of those 2,000 files to look for a match.  Do you think that 
is very efficient?


>
> I added in the rescue
> block the same as you have, and it still exists the loop when run over
> the script itself. 
> 

I have no idea what that means.  If you are asking how to determine what 
error to catch with the rescue statement, do this:  remove the rescue 
statement from your code and try to read a file that RMagick doesn't 
recognize, and then examine the error message.  The error message will 
give the name of the error.  For instance, if you run this program:

puts x

the error message is:

"undefined local variable or method `x' for main:Object (NameError)"

To handle that error, you can write:

begin
  puts x
rescue NameError
  puts "caught the error"
end




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