Le 26/4/2005, "James Edward Gray II" <james / grayproductions.net> a
ñÄrit:
>I'm working with StringIO to write some test code and it is behaving
>strangely.  Check out this example:
>
>irb(main):001:0> require "stringio"
>=> true
>irb(main):002:0> fake_file = StringIO.new
>=> #<StringIO:0x3119cc>
>irb(main):003:0> fake_file.puts "This is a test."
>=> nil
>irb(main):004:0> fake_file.string
>=> "This is a test.\n"
>irb(main):005:0> fake_file.truncate(0)
>=> 0
>irb(main):006:0> fake_file.string
>=> ""
>irb(main):007:0> fake_file.puts " <= Junk!"
>=> nil
>irb(main):008:0> fake_file.string
>=> "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000 <=
>Junk!\n"
>
>Is that a bug?  Yuck.
>
>I hand my "fake_file" off to some code to play with, but keep a
>reference for my testing purposes.  At times, I need to clear the
>accumulated output, but as you can see truncate() is giving me fits.
>
>Can anyone suggest how I might clear the StringIO object, without
>replacing it?

I think #truncate simply memset()s the buffer but it does not
change the position of the file pointer, so you would probably
need to #seek 0, as well.

>Thanks.
>
>James Edward Gray II

E

--
template<typename duck>
void quack(duck& d) { d.quack(); }