Ruby和Netbeans问题

Question

I'm reading a file line by line in a simple program and when I print the the lines to the screen the last line can't be seen at the ouput window in Netbeans 6.5.1 IDE on Windows XP but when I run the program directly from the command line as "ruby main.rb" there is not a problem (ie the last line can be seen).I'm using Ruby 1.8.6.Here is the entire code :

File.open("songs.txt","r") do |file|
  file.each do |line|
    print line
   end
end

Answer 1

I've never run across this before myself, but my guess would be that your final line doesn't have a trailing line break, so the Netbeans console isn't flushing the line. Try adding $stdout.flush at the end of the program and see what happens.

By the way, you can simplify this code slightly by rewriting it using foreach :

File.foreach("songs.txt","r") do |file|
  print line
end

Answer 2

如果您使用puts ，它将更好地工作，如果在行的末尾还没有换行符，则将附加一个换行符，从而强制缓冲区刷新。