(Ruby) 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.

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("username")
ftp.put_Password("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

success = ftp.Disconnect()