From: 7stud -- <bbxx789_05ss@...>
Date: 2009-02-09T07:29:40+09:00
Subject: assignment to $stdout deprecated?

In pickaxe2, on p. 335, it says that assigning to $stdout is deprecated
and to use $stdout.reopen() instead:

-------------------------------------------------------------- IO#reopen
     ios.reopen(other_IO)         => ios
     ios.reopen(path, mode_str)   => ios
------------------------------------------------------------------------
     Reassociates _ios_ with the I/O stream given in _other_IO_ or to a
     new stream opened on _path_. This may dynamically change the actual
     class of this stream.

        f1 = File.new("testfile")
        f2 = File.new("testfile")
        f2.readlines[0]   #=> "This is line one\n"
        f2.reopen(f1)     #=> #<File:testfile>
        f2.readlines[0]   #=> "This is line one\n"


And there is this in the Standard LIbrary:

StringIO

Once a string is wrapped in a StringIO object, it can be read from and
written to as if it were an open file....It also lets you pass strings
into classes and methods that were originally written to work with
files.

But I get an error trying to replace $stdout with a StringIO object:

require "stringio"

strio = StringIO.new
old_out = $stdout
$stdout.reopen(strio)

--output:--
r1test.rb:5:in `reopen': cannot convert StringIO into String (TypeError)
        from r1test.rb:5

What am I doing wrong?
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