...to trust that
:raw:perlio:encoding(UTF-16LE):crlf
[download]
is the best, right way to handle Unicode text in Perl on Windows.
For older versions of Perl (<= 5.8.8), you'd need an additional
:utf8 layer at the end, i.e.
:raw:perlio:encoding(UTF-16LE):crlf:utf8
(although this isn't needed with newer versions, it doesn't do any harm either)
Without it, the strings would end up without the utf8 flag set
(upon reading), which means that Perl wouldn't treat them as
text/unicode strings in regex comparisons, etc., as it should.
Similarly for writing.
$ hd Input.txt
00000000 ff fe e4 00 62 00 63 00 0d 00 0a 00 |..ä.b.c.....|
#!/usr/bin/perl -w
use strict;
use Devel::Peek;
open my $input_fh,
'<:raw:perlio:encoding(UTF-16):crlf', 'Input.txt';
my $line = <$input_fh>;
chomp $line;
Dump $line;
5.8.8 output (wrong):
SV = PV(0x69ae70) at 0x605000
REFCNT = 1
FLAGS = (PADBUSY,PADMY,POK,pPOK)
PV = 0x6778e0 "\303\244bc"\0
CUR = 4
LEN = 80
Output with newer versions (correct):
SV = PV(0x750cb8) at 0x777cc8
REFCNT = 1
FLAGS = (PADMY,POK,pPOK,UTF8)
PV = 0x86a070 "\303\244bc"\0 [UTF8 "\x{e4}bc"]
CUR = 4
LEN = 80
This seems to be the only thing that's been fixed in the meantime.
I think this only goes to prove your point that this is way too arcane
for mere mortals... And, even though there is a "solution" to the
issue, the current behavior of the :crlf layer is definitely a
bug, IMHO. For one, it violates the principle of least surprise. Instead, the following straightforward approach (as anyone sane in his mind would glean from the existing documentation) should work:
open my $fh, '<:encoding(UTF-16LE)', ...
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