From: Mark Van de vyver <mvdv@...>
Date: 2006-12-14T20:14:06+09:00
Subject: newbie: unpacking binary data

Hi,
Thanks for the efforts put into making Ruby available!
While new to Ruby it seems worth investing some time in.  Eventually I'd
like to unpack some data from a binary file and insert it into a MySQL
table.
At the moment I'm having trouble looping over the source data file, and
just viewing the data to make sure things are proceeding correctly.

FYI: eventually I need this to run quickly (many GB's to be processed),
but for the moment I'll settle for getting anything to work :)

The ruby details are:
$ ruby -v
ruby 1.8.5 (2006-08-25) [i386-cygwin]

-----------
 Attempt 1 ( an error )
-----------
File.foreach("./INPUT/T200510A.BIN", "rb") do |f|
   print f.read(19).unpack('I4 I4 I4 I2 I2 a2 a1')
end
NoMethodError: [FATAL] failed to allocate memory

-----------
 Attempt 2 ( an error )
-----------
File.open("./INPUT/T200510A.BIN", "rb").readlines do |f|
  data = f.read(19).unpack('I4 I4 I4 I2 I2 a2 a1')
  print data
end
/usr/lib/ruby/1.8/irb.rb:298:in `inspect': failed to allocate memory
(NoMemoryEr
ror)
        from /usr/lib/ruby/1.8/irb.rb:298:in `output_value'
        from /usr/lib/ruby/1.8/irb.rb:151:in `eval_input'
        from /usr/lib/ruby/1.8/irb.rb:259:in `signal_status'
        from /usr/lib/ruby/1.8/irb.rb:147:in `eval_input'
        from /usr/lib/ruby/1.8/irb/ruby-lex.rb:244:in
`each_top_level_statement'

        from /usr/lib/ruby/1.8/irb/ruby-lex.rb:230:in `loop'
        from /usr/lib/ruby/1.8/irb/ruby-lex.rb:230:in
`each_top_level_statement'

        from /usr/lib/ruby/1.8/irb/ruby-lex.rb:229:in `catch'
        from /usr/lib/ruby/1.8/irb/ruby-lex.rb:229:in
`each_top_level_statement'

        from /usr/lib/ruby/1.8/irb.rb:146:in `eval_input'
        from /usr/lib/ruby/1.8/irb.rb:70:in `start'
        from /usr/lib/ruby/1.8/irb.rb:69:in `catch'
        from /usr/lib/ruby/1.8/irb.rb:69:in `start'
        from /usr/bin/irb:13

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