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Re: Simplest Possible Way To Disable Unicode

by ikegami (Pope)
on May 24, 2011 at 00:17 UTC ( #906385=note: print w/replies, xml ) Need Help??


in reply to Simplest Possible Way To Disable Unicode

File handles can only be used to transmit bytes. The warnings indicate you are trying to transmit characters that aren't bytes, meaning something that doesn't match /^[\x00-\xFF]*\z/.

You need to convert the text you are trying to send into bytes. The process is a special case of serialisation known as character encoding.

You may use Encode's encode, or you may add en encoding layer to the file handle.

open(my $fh, '>', ...) or die ...; my $buf = encode('UTF-8', $text); sysrwite($fh, $buf); # Or: print $fh $buf;
open(my $fh, '>:encoding(UTF-8)', ...) or die ...; sysrwite($fh, $text); # Or: print $fh $text;
binmode($fh, ':encoding(UTF-8)'); sysrwite($fh, $text); # Or: print $fh $text;

is there some minimally-invasive way to wrap [my $image = chr(0xff) . pack('cN', $someThing, $otherThing);] so that when I syswrite it, I get good old-fashioned binary data out?

That code always produces bytes, even for invalid inputs. The resulting string will never cause "Wide character" warnings.

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