(Swift 3,4,5...) Directory Existence Check

How to test if a directory exists on an FTP server.

A good way to check to see if a directory already exists is to try to "cd" to that remote directory by calling ChangeRemoteDir. If it succeeds, then the directory exists. If not, then it does not exist. An alternative method is to set the ListPattern = "*" and then iterate over the files/directories, looking for the 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 = "login"
    ftp.password = "password"

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

    // Does the "temp" directory exist?
    var dirExists: Bool
    dirExists = ftp.changeRemoteDir("/temp")
    if dirExists == true {
        print("Yes, the temp directory exists.")
        //  Yes, it exists. Restore the current remote dir:
        success = ftp.changeRemoteDir("..")
        if success != true {
            print("\(ftp.lastErrorText!)")
            return
        }

    }

    // Alternatively, you may set the ListPattern = "*" and 
    //  look for the directory:
    ftp.listPattern = "*"

    var i: Int
    var n: Int
    n = ftp.getDirCount().intValue
    if n < 0 {
        // Failed to get directory listing based on ListPattern
        print("\(ftp.lastErrorText!)")
        return
    }

    if n > 0 {
        for i = 0; i <= n - 1; i++ {
            var isDir: Bool
            isDir = ftp.getIsDirectory(i)
            if isDir == true {
                var fname: String?
                fname = ftp.getFilename(i)
                if fname == "temp" {
                    print("Found temp directory!")
                    success = ftp.disconnect()
                    return
                }

            }

        }

    }

    success = ftp.disconnect()

}