如何使用Perl的XML :: SAX解析文件？

Question

我正在嘗試XML::SAX解析器來解析XML文件。 XML文件如下所示，

            <message>
                <c1>
                    <rrcConnectionSetupComplete>
                        <rrc-TransactionIdentifier>2</rrc-TransactionIdentifier>
                        <criticalExtensions>
                            <c1>
                                <rrcConnectionSetupComplete-r8>
                                    <selectedPLMN-Identity> 1 </selectedPLMN-Identity>
                                    <dedicatedInfoNAS> 07410109014290112345671000028020000f0 </dedicatedInfoNAS>
                                </rrcConnectionSetupComplete-r8>
                            </c1>
                        </criticalExtensions>
                    </rrcConnectionSetupComplete>
                </c1>
            </message>

Perl代碼如下所示，

use strict;

use XML::SAX;
use MySAXHandler;

my $parser = XML::SAX::ParserFactory->parser(Handler => MySAXHandler->new);

$parser->parse_uri("uL-DCCH-Message.xml");

my $rrc_trans_identifier = $parser->{'c1'}->{'rrcConnectionSetupComplete'}->{'rrc-TransactionIdentifier'};
print "rrc_trans_id :: $rrc_trans_identifier\n";

my $selected_plmn_id = $parser->{c1}->{rrcConnectionSetupComplete}->{criticalExtensions}->{c1}->{'rrcConnectionSetupComplete-r8'}->{'selectedPLMN-Identity'};
print "plmn identity :: $selected_plmn_id\n";

my $rrc_dedicated_info_nas = $parser->{c1}->{rrcConnectionSetupComplete}->{criticalExtensions}->{c1}->{'rrcConnectionSetupComplete-r8'}->{dedicatedInfoNAS};
print "dedicated info nas :: $rrc_dedicated_info_nas\n";

當我運行這段代碼時，我得到的輸出是

Can't locate MySAXHandler.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .) at sax.pl line 4.
BEGIN failed--compilation aborted at sax.pl line 4.

我從CPAN安裝了XML :: SAX，但仍然顯示某些模塊丟失錯誤。

我的問題是

1. 是否需要安裝其他模塊？

2. 要訪問XML文件中的值，我遵循的過程正確嗎？

例如：

my $rrc_trans_identifier = $parser->{'c1'}->{'rrcConnectionSetupComplete'}->{'rrc-TransactionIdentifier'};
print "rrc_trans_id :: $rrc_trans_identifier\n";

Answer 1

您需要編寫自己的MySAXHandler （線索就是名字！）。

有關更多詳細信息，請參見SAX :: Intro文檔。