Get a Remote File's Size as a String

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Demonstrates the Chilkat SFtp.GetFileSizeStr method, which returns a remote file's size in bytes as a decimal string. The arguments are the remote path (or handle), whether symbolic links are followed, and whether the first argument is a handle.

func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the SFtp.GetFileSizeStr method, which returns a remote file's size in bytes as a
    //  decimal string.  The 1st argument is the remote path (or handle), the 2nd selects whether
    //  symbolic links are followed, and the 3rd indicates whether the 1st argument is a handle.

    let sftp = CkoSFtp()!

    //  Connect, authenticate, and initialize the SFTP subsystem.
    var port: Int = 22
    success = sftp.connect(hostname: "sftp.example.com", port: port)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  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.
    var password: String? = "mySshPassword"

    success = sftp.authenticatePw(login: "mySshLogin", password: password)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    success = sftp.initializeSftp()
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  The 2nd argument (bFollowLinks) selects whether a symbolic link is followed to its target.
    //  The 3rd argument (bIsHandle) is false here because the 1st argument is a path, not an
    //  open handle.
    var bFollowLinks: Bool = true
    var bIsHandle: Bool = false

    //  A string return avoids the 32-bit overflow that GetFileSize32 would have for very large files.
    var fileSize: String? = sftp.getFileSizeStr(pathOrHandle: "subdir/hugefile.dat", bFollowLinks: bFollowLinks, bIsHandle: bIsHandle)
    if sftp.lastMethodSuccess == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("File size: \(fileSize!) bytes")

    sftp.disconnect()

}