Swift

Write Text to a Remote SFTP File (Sequential)

Demonstrates the Chilkat SFtp.WriteFileText method, which encodes text using a charset and writes it at the current sequential write position of an open handle. The arguments are the handle, the charset, and the text.

Background: Chilkat tracks a write position per handle, so successive WriteFileText calls append naturally — the pattern for building a file a piece at a time, such as writing rows to a report. Opening with openOrCreate starts writing at the current end of the file. The charset determines the bytes actually stored, which matters whenever the text contains non-ASCII characters.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the SFtp.WriteFileText method, which encodes text and writes it at the current
    //  sequential write position of an open handle.  The 1st argument is the handle, the 2nd is the
    //  charset, and the 3rd is the text.

    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
    }

    //  Open (creating/truncating) the remote file for writing.
    var handle: String? = sftp.openFile(filename: "subdir/notes.txt", access: "writeOnly", createDisp: "createTruncate")
    if sftp.lastMethodSuccess == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  Write text as UTF-8.  Successive writes continue from where the previous write ended.
    success = sftp.writeFileText(sftpHandle: handle, charset: "utf-8", textData: "First line.\n")
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    success = sftp.writeFileText(sftpHandle: handle, charset: "utf-8", textData: "Second line.\n")
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

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

    print("Wrote text file.")

    sftp.disconnect()

}