File manipulation


#1

as a part of another program, i need to be able to keep an index number
inside of a file…

what i want to do is:

open the file
get its contents and store in a local variable
clear its contents
store an incremented version of the index…

right now, i know i am doing this in a kludgy way…

it works, but not pretty…

i end up opening the file ‘r’, getting the number
closing the file

opening it again ‘w+’
storing the value
closing the file…

is there a method that will just clear the file?

my current code is:

def self.get_index
index_file = File.open(‘index’,‘r’)
index = index_file.gets
index_file.close
index_file = File.open(‘index’,‘w+’)
puts "index value: " + index.to_s
index_file.puts(index.to_i + 1).to_s
index_file.close
end


#2

On Apr 12, 2:52 pm, Sergio R. removed_email_address@domain.invalid wrote:

right now, i know i am doing this in a kludgy way…
is there a method that will just clear the file?
index_file.close
end


Posted viahttp://www.ruby-forum.com/.

File.open( ‘index’, ‘r+’) {|f|
index = f.gets.to_i
puts “Index value: #{ index }”
f.rewind
f.truncate(0)
f.puts( index + 1 )
}


#3

File.open( ‘index’, ‘r+’) {|f|
index = f.gets.to_i
puts “Index value: #{ index }”
f.rewind
f.truncate(0)
f.puts( index + 1 )
}

perfect!

thanks so much!