Question

我想从ftp服务器（host1）下载一堆包含内容的目录。为此，我使用了库Net::FTP::Recursive。当我运行代码时，文件夹和文件已下载。不过，我收到了以下消息：

>Can't call method "filename" without a package or object reference 
 at C:\10_LIB~1\PerlLib\lib\perl5/Net/FTP/Recursive.pm line 86.

我想知道为什么会发生这种情况，产生什么影响以及如何避免这种情况。

这是要下载的代码：

# -- Libraries

# coding and diagnostic
use strict;
use warnings;

# FTP connection
use Net::FTP;
use Net::FTP::Recursive;

# -- Settings

my $host1      = "ftp.host1.com";
my $user1      = "myname\@myweb.com";
my $password1  = "password";

# -- Connection to ftp server

my $f1 = Net::FTP::Recursive->new($host1) or die "Can't open \$f1 $host1\n";
$f1->login($user1, $password1) or die "Can't log \$f1 $user1 in\n";
$f1->cwd() or die "Can't cwd to host folder\n";

# $f1->ascii();
$f1->binary;

# -- Directory to download the contents

my $download = "C:/mydirectory/download";
chdir($download);

# -- Host1

$f1->cwd();
$f1->rget( ParseSub => \&yoursub1 );
$f1->quit;    

sub yoursub1 {
$f1->rget;
}

我在Windows 7版本上使用了perl：

perl -v
This is perl 5, version 28, subversion 0 (v5.28.0) built for MSWin32-x64-multi-thread

这是/Net/FTP/Recursive.pm中的代码，直到消息的第86行：

sub _rget {
    my($ftp) = shift;

    my @dirs;

    my @ls = $ftp->dir();

    my @files = $options{ParseSub}->( @ls );

    @files = grep { $_->filename =~ $options{MatchAll} } @files
      if $options{MatchAll};

    @files = grep { $_->filename !~ $options{OmitAll} } @files
      if $options{OmitAll};

    print STDERR join("\n", @ls), "\n"
      if $ftp->debug;

    my $remote_pwd = $ftp->pwd;
    my $local_pwd = Cwd::cwd();

    FILE:
    foreach my $file (@files){
        #used to make sure that if we're deleting the files, we
        #successfully retrieved the file
        my $get_success = 1;
        my $filename = $file->filename();       # <- 86

Answer 1

yoursub1是完全错误的。假定解析从FTP服务器返回的行（作为子参数提供），并为每个远程文件（.和{除外）返回Net :: FTP :: Recursive :: File对象的列表。 {1}}。

如果默认实现（..）就足够了，只需删除Net::FTP::Recursive::parse_files。否则，您可能应该首先复制ParseSub => \&yoursub1并根据FTP服务器的输出进行调整。

没有包或对象引用就无法调用方法“文件名”

1 个答案: