File Existence Check

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

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.***.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

#  Set the current remote directory to where the file is located:
success = ftp.ChangeRemoteDir("/something")
if (success != true)
    print ftp.lastErrorText() + "\n"
    exit
end

#  Test to see if the file exists by getting the file size by name.
#  If a -1 is returned, the file does not exist.
fileSize = ftp.GetSizeByName("test123.txt")
if (fileSize < 0)
    print "file does not exist" + "\n";
else
    print "file exists and is " + fileSize.to_s() + 
        " bytes in size" + "\n";
end

ftp.Disconnect()