这个问题与这个问题相关:哈希键编码:为什么我使用Devel::Peek::Dump获得了两个不同的结果?
当我取消注释# utf8::upgrade( $name );
行或者注释掉$hash{'müller'} = 'magenta';
行时,它可以工作。
#!/usr/bin/env perl
use warnings;
use 5.014;
use utf8;
binmode STDOUT, ':encoding(utf-8)';
use XML::LibXML;
# Hash read in from a file:
# ...
my %hash = ( 'müller' => 'green', 'schneider' => 'blue', 'bäcker' => 'red' );
# ...
# change or add something
$hash{'müller'} = 'magenta';
# writing Hash to xml file
my $doc = XML::LibXML::Document->new('1.0', 'UTF-8' );
my $root = $doc->createElement( 'my_test' );
for my $name ( keys %hash ) {
# utf8::upgrade( $name );
my $tag = $doc->createElement( 'item' );
$tag->setAttribute( 'name' => $name );
my $tag_color = $doc->createElement( 'color' );
$tag_color->appendTextNode( $hash{$name} );
$tag->appendChild( $tag_color );
$root->appendChild( $tag );
}
$doc->setDocumentElement($root);
say $doc->serialize( 1 );
$doc->toFile( 'my_test.xml', 1 );
输出:
error : string is not in UTF-8
encoding error : output conversion failed due to conv error, bytes 0xFC 0x6C 0x6C 0x65
I/O error : encoder error
<?xml version="1.0" encoding="ISO-8859-1"?>
<my_test>
<item name="m
i18n error : output conversion failed due to conv error, bytes 0xFC 0x6C 0x6C 0x65
I/O error : encoder error