如何将UTF-8字符串与Perl的printf正确对齐？ [英] How can I properly align UTF-8 strings with Perl's printf?

问题描述

what is the right way to get here a beautiful output ( all lines the same indent )?

#!/usr/bin/env perl
use warnings;
use strict;
use DBI;

my $phone_book = [ [ qw( name number ) ],
            [ 'Kroner', 123456789 ],
            [ 'Holler', 123456789 ],
            [ 'Mühßig', 123456789 ],
            [ 'Singer', 123456789 ],
            [ 'Maurer', 123456789 ],
];

my $dbh = DBI->connect( "DBI:CSV:", { RaiseError => 1 } );
$dbh->do( qq{ CREATE TEMP TABLE phone_book AS IMPORT( ? ) }, {}, $phone_book );

my $sth = $dbh->prepare( qq{ SELECT name, number FROM phone_book } );
$sth->execute;

my $array_ref = $sth->fetchall_arrayref();

for my $row ( @$array_ref ) {
    printf "%9s %10s\n", @$row;
}

# OUTPUT:

#   Kroner  123456789
#   Holler  123456789
# Mühßig  123456789
#   Singer  123456789
#   Maurer  123456789

推荐答案

我还没有重现它，但是松散地说，似乎正在发生的是这是字符编码不匹配。很可能您的Perl源文件已被保存为UTF-8编码。但是您尚未在脚本中启用使用utf8; 。因此，它将每个非ASCII德语字符解释为两个字符，并相应地设置填充。但您正在运行的终端也是UTF-8模式，因此字符打印正确。尝试添加使用警告; ，我敢打赌你得到一个警告打印，我不会惊讶，如果添加使用utf8; 实际上解决了这个问题。

I haven't been able to reproduce it, but loosely speaking what seems to be happening is that it's a character encoding mismatch. Most likely your Perl source file has been saved in UTF-8 encoding. However you have not enabled use utf8; in the script. So it's interpreting each of the non-ASCII German characters as being two characters and setting the padding accordingly. But the terminal you're running on is also in UTF-8 mode so the characters print correctly. Try adding use warnings; and I'll bet you get a warning printed, and I would not be surprised if adding use utf8; actually fixes the problem.

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