Restart/Resume FTP Download

Resume downloading a file from an FTP server.

Download Chilkat Ruby Library

require 'chilkat'

ftp = Chilkat::CkFtp2.new()

#  Any string unlocks the component for the 1st 30-days.
success = ftp.UnlockComponent("Anything for 30-day trial")
if (success != true)
    print ftp.lastErrorText() + "\n"
    exit
end

ftp.put_Hostname("ftp.chilkatsoft.com")
ftp.put_Username("****")
ftp.put_Password("****")

#  Connect and login to the FTP server.
success = ftp.Connect()
if (success != true)
    print ftp.lastErrorText() + "\n"
    exit
end

#  Change to the remote directory where the file is located.
#  This step is only necessary if the file is not in the root directory
#  for the FTP account.
success = ftp.ChangeRemoteDir("temp")
if (success != true)
    print ftp.lastErrorText() + "\n"
    exit
end

#  To resume a download, it is assumed that the partial file
#  is already present on the local filesystem.
#  You only need to set the RestartNext property to resume
#  the download.  The Chilkat FTP component sets the resume
#  point by getting the existing size of the target (local) file.
ftp.put_RestartNext(true)

localFilename = "big.zip"
remoteFilename = "big.zip"

#  Resume downloading...
success = ftp.GetFile(remoteFilename,localFilename)
if (success != true)
    print ftp.lastErrorText() + "\n"
    exit
end

ftp.Disconnect()

print "File Downloaded!" + "\n"