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Re: PerlIO: crlf layer on Windows interfering with UCS-2 unicode

by ikegami (Pope)
on Jun 03, 2008 at 10:53 UTC ( #689841=note: print w/replies, xml ) Need Help??

in reply to PerlIO: crlf layer on Windows interfering with UCS-2 unicode

Surprisingly, the trick only works for open, not binmode.

use strict; use warnings; sub dump_layers(*) { my @layers = PerlIO::get_layers($_[0]); print STDERR "@layers\n"; } my $file = 'temp'; { open(my $fh, '>:raw:encoding(ucs-2le):crlf:utf8', $file) or die; dump_layers($fh); } { open(my $fh, '<:raw:encoding(ucs-2le):crlf:utf8', $file) or die; dump_layers($fh); } unlink $file; binmode STDOUT, ':raw:encoding(ucs-2le):crlf:utf8' or die; dump_layers STDOUT; binmode STDIN, ':raw:encoding(ucs-2le):crlf:utf8' or die; dump_layers STDIN;
unix encoding(UCS-2LE) utf8 crlf utf8 unix encoding(UCS-2LE) utf8 crlf utf8 unix crlf encoding(UCS-2LE) utf8 unix crlf encoding(UCS-2LE) utf8

The only solution I've found follows, but I don't like it.

binmode $fh, ':raw:pop:encoding(ucs-2le):crlf:utf8'; # ^^^

The issue is that :raw disables the existing :crlf layer (but doesn't remove it) when using binmode. Then, the later :crlf reactivates the earlier :crlf layer instead of adding a new layer, messing everything up.

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[Corion]: If you cram your slides with that much information, they might work in an "offline" situation but not very well for a live presentation IMO
[ambrus]: Corion: in that case I also ask the people who rent the conference rooms to tell conference organizers about the available tech.
[Corion]: ambrus: No, you're misunderstanding. If you place content too far on the left/right/top/ bottom, people might not see it because the view is obstructed ;)(
[Corion]: In Amsterdam, the screen went down to the bottom of the stage (60cm above ground) and the seating was on the ground, meaning that the rows in the back couldn't see the bottom of slides.
[Corion]: There also were some columns that meant that maybe you couldn't see the left/right edge of a slide.
[ambrus]: Corion: Sure. I've had a course in a 50 seat lecture hall that has two fucking columns in the middle.
[Corion]: Talking about it, the top should be fairly visible in the situations I've experienced at least. The top is uncomfortable for people in the first three rows, but that's life ;)
[ambrus]: The pillars are there because this is in the 6th floor of building R of BME, which is an attic that was built in after the original building, which is also why the elevator doesn't go that high and the windows are tiny.
[Corion]: ambrus: Hehe ;) Yeah - such real life stuff is far more inconveniencing than wasting display area due to screen ratio problems :)
[ambrus]: Corion: yes, it's a bit tricky. you can try to adjust the slides live to cover only a part of the screen, but it's still hard.

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