(Swift 2) 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 Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let ftp = CkoFtp2()

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

    ftp.KeepSessionLog = true

    // Connect and login to the FTP server.
    var success: Bool = ftp.Connect()
    if success != true {
        print("\(ftp.LastErrorText)")
        return
    }

    // 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)")
        return
    }

    // 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.
    var mode: Int = 1
    var descendTree: Bool = true
    var previewOnly: Bool = true
    success = ftp.SyncRemoteTree2("/temp/abc123", mode: mode, bDescend: descendTree, bPreviewOnly: previewOnly)
    if success != true {
        print("\(ftp.LastErrorText)")
        return
    }

    // 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:
    let sa = CkoStringArray()
    sa.LoadFromText(ftp.SyncPreview)

    let fac = CkoFileAccess()

    var numFiles: Int = sa.Count.intValue
    var i: Int = 0
    var localFilePath: String?
    while (i < numFiles) {
        localFilePath = sa.GetString(i)
        print("\(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 != true {
            print("Failed to delete: \(localFilePath!)")
        }

        i = i + 1
    }

    success = ftp.Disconnect()

}