Perl

Get a Remote FTP File's Size by Name

Demonstrates the Chilkat Ftp2.GetSizeByName method, which returns the size in bytes of a named file in the current remote directory as a 32-bit integer. The only argument is the filename — a name, not a path. It returns -1 when the file is not found or the size cannot be obtained.

Background: This is the direct way to get one file's size when you already know its name, typically via a SIZE command — no full directory listing required. Because the result is 32-bit, it cannot represent files past about 2 GB; use GetSizeStrByName for large files. The argument must be a bare filename in the current directory, so ChangeRemoteDir to the right place first.

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use strict;
use warnings;
use Chilkat2;

# Demonstrates the Ftp2.GetSizeByName method, which returns the size in bytes of a named file in
# the current remote directory as a 32-bit integer.  The only argument is the filename (a name,
# not a path).

my $ftp = Chilkat2::Ftp2->new;

$ftp->Hostname('ftp.example.com');
$ftp->Username('myFtpLogin');

# Normally you would not hard-code the password in source.  You should instead obtain it
# from an interactive prompt, environment variable, or a secrets vault.
$ftp->Password('myPassword');

my $success = $ftp->Connect();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}

$success = $ftp->ChangeRemoteDir('public_html');
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}

# Returns -1 when the file is not found or the size cannot be obtained.  For files that may
# exceed 2 GB, use GetSizeStrByName (returns a decimal string).
my $fileSize = $ftp->GetSizeByName('report.pdf');
if ($fileSize < 0) {
    print "File not found, or size unavailable.\n";
    exit;
}

print 'report.pdf is ', $fileSize, " bytes\n";

$success = $ftp->Disconnect();
if (!$success) {
    print $ftp->LastErrorText, "\n";
    exit;
}