(Ruby) Delete Local Files that Do Not Exist on the FTP Server

Demonstrates how to get a list of local files in a directory tree that do not exist on the 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")

ftp.put_KeepSessionLog(true)

# 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 the root of
# the remote tree to be compared.
success = ftp.ChangeRemoteDir("abc123")
if (success != true)
    print ftp.lastErrorText() + "\n";
    exit
end

# Recursively descend the local directory tree
# and find the files that exist locally but not remotely.
# These are the files what would be uploaded via
# the SyncRemoteTree method call with mode = 1.
# (Mode 1 would upload all files that do not exist on the FTP server.)

# The actual uploading is avoided by setting the preview-only argument to true.
mode = 1
descendTree = true
previewOnly = true
success = ftp.SyncRemoteTree2("/temp/abc123",mode,descendTree,previewOnly)
if (success != true)
    print ftp.lastErrorText() + "\n";
    exit
end

# The files what would've been uploaded are now available in the SyncPreview property,
# which contains a list of local file paths, one per line.
# A program can iterate over them like this:
sa = Chilkat::CkStringArray.new()
sa.LoadFromText(ftp.syncPreview())

fac = Chilkat::CkFileAccess.new()

numFiles = sa.get_Count()
i = 0

while (i < numFiles)
    localFilePath = sa.getString(i)
    print localFilePath + "\n";

    # An application can delete the file using Chilkat's file access object,
    # or it can choose to use the native file API available in the programming language:
    success = fac.FileDelete(localFilePath)
    if (success != true)
        print "Failed to delete: " + localFilePath + "\n";
    end

    i = i + 1
end

success = ftp.Disconnect()