(PowerShell) 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 .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$ftp = New-Object Chilkat.Ftp2

$ftp.Hostname = "ftp.example.com"
$ftp.Username = "login"
$ftp.Password = "password"

$ftp.KeepSessionLog = $true

# Connect and login to the FTP server.
$success = $ftp.Connect()
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# Set the current remote directory to the root of
# the remote tree to be compared.
$success = $ftp.ChangeRemoteDir("abc123")
if ($success -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# 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 -ne $true) {
    $($ftp.LastErrorText)
    exit
}

# 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 = New-Object Chilkat.StringArray
$sa.LoadFromText($ftp.SyncPreview)

$fac = New-Object Chilkat.FileAccess

$numFiles = $sa.Count
$i = 0

while (($i -lt $numFiles)) {
    $localFilePath = $sa.GetString($i)
    $($localFilePath)

    # 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 -ne $true) {
        $("Failed to delete: " + $localFilePath)
    }

    $i = $i + 1
}

$success = $ftp.Disconnect()