From: James Smith <jmdjmsmith@...>
Date: 2006-11-08T09:54:28+09:00
Subject: Two way communication with the command shell (IO.popen?)



Hi,

I would basically like to be able to run a ruby program from my rails
application and be able to read from it and write to it accordingly.

OK, i am currently using:

IO.popen("ruby ruby_program.rb", "r+") do |f|
@read = f.read
@write = f.write  #this is where i need help
end

say if the external ruby program was as follows:

0  def readWrite
1  puts "printing.."
2  @string = gets
3  end
4  readWrite

I can currently read (in example) "printing..", however when it reaches
line 2 of the ruby program, i can't seem to write to it, and my rails
program just waits. I need to use something that says "read from program
until it is waiting for input, and then write to it" (also, when writing
to the program, how do i emulate the user pressing enter - \n? )

Thanks


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