Read Text at a String Offset from a Remote SFTP File

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Demonstrates the Chilkat SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the maximum number of bytes, and the charset.

func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the SFtp.ReadFileText64s method, which is like ReadFileText64 but takes the byte
    //  offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string, the
    //  3rd is the maximum number of bytes, and the 4th is the charset.

    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
    }

    var handle: String? = sftp.openFile(filename: "subdir/hugefile.dat", access: "readOnly", createDisp: "openExisting")
    if sftp.lastMethodSuccess == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  Supplying the offset as a string is convenient in languages without a native 64-bit integer.
    var offset: String? = "5000000000"
    var numBytes: Int = 6
    var text: String? = sftp.readFileText64s(handle: handle, offset: offset, numBytes: numBytes, charset: "utf-8")
    if sftp.lastMethodSuccess == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("\(text!)")

    success = sftp.closeHandle(sftpHandle: handle)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    sftp.disconnect()

}