From: Wes Gamble <weyus@...>
Date: 2006-03-22T09:18:45+09:00
Subject: Re: Newbie: Better way to check a magic number on a file?

An even better way would be to take advantage of the fact that I'm 
uploading through a browser and just look at the MIME type

:) :) :)

Man, I'm dumb :).

But on the other hand, now I now about the IO module, and modules in 
general and all kinds of things.

Thanks, everybody.

Wes

Mike Stok wrote:
> On 21-Mar-06, at 6:46 PM, Wes Gamble wrote:
> 
>>     magic_number = nil
>>
>> Should magic_number.eql?('d0cf11e0a1b1') work?
> 
> There are a number of simpler ways, one might be
> 
>    EXCEL_FILE_MAGIC_NUMBER = ['d0cf11e0a1b1'].pack('H*')
> 
>    # later
> 
>    magic_number == EXCEL_FILE_MAGIC_NUMBER # => true or false
> 
> or you can use octal or hex escapes to have a string literal to
> compare against e.g.
> 
> irb(main):006:0> "\320\317\021\340\241\261" == "\xd0\xcf\x11\xe0\xa1
> \xb1"
> => true
> 
> Maybe there are good bits of the Pickaxe (Programming Ruby) or some
> on-line tutorials which can help you see some of the more ruby-ish
> ways to do things.
> 
> Hope this helps,
> 
> Mike
> 
> --
> 
> Mike Stok <mike@stok.ca>
> http://www.stok.ca/~mike/
> 
> The "`Stok' disclaimers" apply.


-- 
Posted via http://www.ruby-forum.com/.