(Swift 3,4,5...) FTP Non-Recursive Sync Directory (Download)

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Download files from the server that have filenames matchhing a pattern, and don't yet exist in a local directory.

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 = "myUsername"
    ftp.password = "myPassword"
    ftp.port = 21
    ftp.authTls = true

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

    // Change to the remote directory where the files are located.
    // This step is only necessary if the files are not in the root directory
    // of the FTP account.
    success = ftp.changeRemoteDir("qa")
    if success != true {
        print("\(ftp.lastErrorText!)")
        return
    }

    // Indicate that we only want to download files with filenames ending in ".txt"
    ftp.syncMustMatch = "*.txt"

    // Modes for synchronization are as follows:
    // mode=0: Download all files
    // mode=1: Download all files that do not exist on the local filesystem.
    // mode=2: Download newer or non-existant files.
    // mode=3: Download only newer files. If a file does not already exist on the local filesystem, it is not downloaded from the server.
    // mode=5: Download only missing files or files with size differences.
    // mode=6: Same as mode 5, but also download newer files.
    // mode=99: Do not download files, but instead delete remote files that do not exist locally.
    var mode: Int = 1

    // Download all files matching "*.txt" from the current remote ftp directory.
    // The files are downloaded into c:/temp/qa_output
    success = ftp.syncLocalDir("c:/temp/qa_output", mode: mode)
    if success != true {
        print("\(ftp.lastErrorText!)")
        return
    }

    // We can see what files were downloaded in the SyncedFiles property,
    // which lists the files one per line.
    print("\(ftp.syncedFiles!)")

    // Perhaps we wish to delete the files we just downloaded from the server..
    let sb = CkoStringBuilder()!
    sb.append(ftp.syncedFiles)

    let st = CkoStringTable()!
    st.append(fromSb: sb)

    var numFiles: Int = st.count.intValue
    var i: Int = 0
    var remoteFilename: String?
    while i < numFiles {
        remoteFilename = st.string(at: i)
        print("Deleting \(remoteFilename!) from the FTP server")
        success = ftp.deleteRemoteFile(remoteFilename)
        if success != true {
            print("\(ftp.lastErrorText!)")
            return
        }

        i = i + 1
    }

    success = ftp.disconnect()

}