From: Robert Dober <robert.dober@...>
Date: 2006-07-16T19:14:48+09:00
Subject: Re: Newbie question on an I/O loop

------=_Part_40173_11621626.1153044885934
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

On 7/16/06, Jay Daniels <jkdaniels@rock.com> wrote:
>
> I got a question that's puzzling me. Am new to Ruby but programming for
> decades. Here's the problem.


Welcome to the red world

This apparently simple loop reads 396 bytes
> of a file and no more. The actual file is 1.5KB and I can display it
> easily in a hex dumper. The bytes Ruby has read are all correct. It just
> seems to stop after 396 bytes. Any idea what's wrong or where I should
> be looking?
>
> Many thanks in advance,
>
> JK Daniels
>
> >>> code >>>
>
> if ARGV[0] =3D=3D nil
>     puts( "\n" + $help )
> else
>     i =3D 0
>     tfm =3D File.open( ARGV[0] )
>     tfm.each_byte{ |c| i =3D i + 1; printf( "%d: %X\n", i, c ) }
>     if tfm.eof
>         puts "at eof" else puts "not at eof"
>     end
> end
>
> <<< end code <<<
>
> This outputs the first 396 bytes and then state it's at EOF. If it makes
> any difference, the last three bytes it reads are (all hex): C0 A4 00
> and the next three (unread) bytes in the file are: 1A C0 B5


Hmm you are not reading a binary file under windows by any chance?
In that case File.open needs a mode "rb".
Anyway the ruby way to do what you want is more like this

File.open ARGV.first, "rb"  do # I would put paranthesis, but just to
demonstrate the
                                              # various possibilities
               |file|
               i =3D 0
               file.each_byte {
                        |c|
                        i +=3D 1
                       puts "%d:%X" % [ i, c ]
               }
end
puts "at eof ;)"


Cheers
Robert

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


--=20
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

------=_Part_40173_11621626.1153044885934--