From: Chris Dwan <radixhound@...>
Date: 2007-07-23T07:58:30+09:00
Subject: Re: Digest Articles 261154-261275 (11/13) (ruby-talk ML)

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> From: John Joyce <dangerwillrobinsondanger@gmail.com>
> Date: July 22, 2007 7:46:39 AM PDT (CA)
>
> On Jul 22, 2007, at 5:21 AM, Chris Dwan wrote:
>
>> I have a problem with a script I'm working on.  File.exists? is  
>> telling me that a file does in fact exist, then immediately after  
>> when I try to do a File.read, it crashes because the file doesn't  
>> exist.  I know that it does not exist, because I'm testing that  
>> condition. If the file doesn't exist, it should do something else.
>>
>> <sigh> this is on Windows, so maybe the OS is to blame?
>> Here's the code, if it helps..
>>
>>             $debug_log.fatal("does file exist? :: #{ibl}")
>>             if File.exist?(ibl)
>>               $debug_log.fatal("YES - it most certainlyt does!")
>>               iblLocation = ibl
>>             else
>>                 #find the file and set iblLocation
>>             end
>>             File.read(iblLocation) # << bombs here
>>
>> The file referred to by ibl was recently renamed by this same  
>> script, so the file name in ibl is no longer valid. The script  
>> should then go looking for ibl's new name and use that... but it  
>> won't work <sob><sob>
>>
>> Hope someone can enlighten me.
>> Thanks!
>>
>>
> You need to open the file  first.
> File.new  OR File.open
> check them with ri first, you may need to choose binary or text  
> when setting the file mode because you're using window

That doesn't make any sense! File.exists? is a class method, and if I  
try to do File.open, it will fail because the file doesn't exist, so  
I'll have to catch the exception. It basically means File.exists? is  
useless so I should just use exceptions to handle stuff like this.. ?


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