Ruby

Get an FTP Listing Entry's Last-Modified Time

Demonstrates the Chilkat Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a cached directory-listing entry as an RFC 822 date-time string. The only argument is a zero-based index.

Background: The last-modified time is the workhorse timestamp: it updates whenever a file's contents change and is what sync and mirror logic compares to decide whether a file needs re-transferring. It is the most reliably reported of the three across FTP servers, and the RFC 822 string carries a timezone so comparisons are well defined.

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require 'chilkat'

success = false

#  Demonstrates the Ftp2.GetLastModifiedTimeStr method, which returns the last-modified time of a
#  cached directory-listing entry as an RFC 822 date-time string.  The only argument is a
#  zero-based index.

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("ftp.example.com")
ftp.put_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.put_Password("myPassword")

success = ftp.Connect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

success = ftp.ChangeRemoteDir("public_html")
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end

#  GetDirCount retrieves the directory listing on the first call and returns the number of
#  entries.  A negative return indicates failure.
n = ftp.GetDirCount()
if (n < 0)
    print ftp.lastErrorText() + "\n";
    exit
end

for i in 0 .. n - 1
    name = ftp.getFilename(i)

    #  The value is an RFC 822 string such as "Fri, 21 Nov 1997 09:55:06 -0600".
    lastModified = ftp.getLastModifiedTimeStr(i)
    print name + "  modified " + lastModified + "\n";
end

success = ftp.Disconnect()
if (success == false)
    print ftp.lastErrorText() + "\n";
    exit
end