(Ruby) Restart/Resume FTP Download

Resume downloading a file from an FTP server.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("ftp.example.com")
ftp.put_Username("login")
ftp.put_Password("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

success = ftp.Disconnect()

print "File Downloaded!" + "\n";