Swift

Check if an FTP Listing Entry is a Symbolic Link

Demonstrates the Chilkat Ftp2.GetIsSymbolicLink method, which returns whether a cached directory-listing entry is a symbolic link. The only argument is a zero-based index. This information is available only when the server's listing format reports it.

Background: Symbolic links matter because following one can lead outside the expected directory or into a cycle, so recursive operations often need to identify and skip them. Unlike the file/directory distinction, symlink information is not always present — only listing formats that mark links (typically Unix-style LIST output) expose it, and this returns false when the server does not.

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func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the Ftp2.GetIsSymbolicLink method, which returns whether a cached directory-listing
    //  entry is a symbolic link.  The only argument is a zero-based index.  This information is only
    //  available when the server's listing format reports it.

    let ftp = CkoFtp2()!

    ftp.hostname = "ftp.example.com"
    ftp.username = "myFtpLogin"

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    ftp.password = "myPassword"

    success = ftp.connect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    success = ftp.changeRemoteDir(relativeDirPath: "public_html")
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }

    //  GetDirCount retrieves the directory listing on the first call and returns the number of
    //  entries.  A negative return indicates failure.
    var n: Int = ftp.getDirCount().intValue
    if n < 0 {
        print("\(ftp.lastErrorText!)")
        return
    }

    var i: Int
    for i = 0; i <= n - 1; i++ {
        var name: String? = ftp.getFilename(index: i)
        if ftp.getIsSymbolicLink(index: i) {
            print("[LINK] \(name!)")
        }
        else {
            print("       \(name!)")
        }

    }

    success = ftp.disconnect()
    if success == false {
        print("\(ftp.lastErrorText!)")
        return
    }


}