我正在解析 XML 文件并尝试访问 XML 文件中的值。
#!/usr/bin/perl -w
use strict;
use XML::Twig;
my $file = 'files/camelids.xml';
print "File :: $file\n";
my $twig = XML::Twig->new();
$twig->parsefile($file);
# print "twig :: $twig\n";
my $root = $twig->root;
# print "root :: $root\n";
my $num = $root->children('species');
print "num :: $num\n\n\n";
print $root->children('species')->first_child_text('common-name');
示例 XML 文件是:
<?xml version="1.0"?>
<camelids>
<species name="Camelus bactrianus">
<common-name>Bactrian Camel</common-name>
<physical-characteristics>
<mass>450 to 500 kg.</mass>
<appearance>
<in-appearance>
<inside-appearance>This is in inside appearance</inside-appearance>
</in-appearance>
</appearance>
</physical-characteristics>
</species>
</camelids>
输出是:
File :: files/camelids.xml
num :: 1
Can't call method "first_child_text" without a package or object reference at xml-twig_read.pl line 19.
如何解决这个问题?
这行代码有什么问题吗?是否需要修改(这里我试图将common-name
作为Bactrian Camel
)
print $root->children('species')->first_child_text('common-name');
最佳答案
将最后一行更改为
my @nums = $root->children('species');
print "num :: @nums\n\n\n";
foreach my $num (@nums) {
print $num->first_child_text('common-name');
}
children 返回一个数组,所以你需要遍历它。
为了帮助调试,试试这个:
my @nums = $root->children('species');
use Data::Dumper; #More debug information like this than a normal print
print Dumper @nums;
foreach my $num (@nums) {
print $num->first_child_text('common-name');
}
关于xml - 如何使用 Perl 的 XML::Twig 从 XML 中提取子值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3766573/