ruby - 如何使用 Ruby 和 IO.popen 写入和读取进程？

Question

我写了这个，但是没有用...

output = IO.popen("irb", "r+") do |pipe|  pipe.gets  pipe.puts "10**6"  pipe.gets  pipe.puts "quit"end

我这样重写

IO.popen("irb", "w+") do |pipe|  3.times {puts pipe.gets} # startup noise  pipe.puts "10**6\n"  puts pipe.gets # I expect " => 1000000"  pipe.puts "quit" # I expect exit from irbend 

但它也没有用

Answer 1

要么做

IO.popen("ruby", "r+") do |pipe|
  pipe.puts "puts 10**6"
  pipe.puts "__END__"
  pipe.gets
end

或者做

IO.popen("irb", "r+") do |pipe|
  pipe.puts "\n"
  3.times {pipe.gets} # startup noise
  pipe.puts "puts 10**6\n"
  pipe.gets # prompt
  pipe.gets
end