(Swift 3,4,5...) SFTP Fsync -- Flush an Open File on the Server

Demonstrates how to flush the contents of an open file on the server. This example only works for servers that implement the fsync@openssh.com extension.

Note: This example requires Chilkat v9.5.0.71 or later.

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let sftp = CkoSFtp()!

    // Pass a domain or IP address..
    var success: Bool = sftp.connect("my-sftp-server.com", port: 22)
    if success == true {
        success = sftp.authenticatePw("mySFtpLogin", password: "mySFtpPassword")
    }

    if success == true {
        success = sftp.initializeSftp()
    }

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

    // Open a file on the server for writing.
    var handle: String? = sftp.openFile("myTest.txt", access: "writeOnly", createDisp: "createTruncate")
    if sftp.lastMethodSuccess != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Write some text to the file:
    success = sftp.writeFileText(handle, charset: "ansi", textData: "abcdefghijklmnopqrstuvwxyz")
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Make sure the server flushes what we wrote to the disk..
    // (this is requires a server that implements the fsync@openssh.com SFTP protocol extension)
    success = sftp.fsync(handle)
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // ....
    // ....

    success = sftp.writeFileText(handle, charset: "ansi", textData: "ABCDEFGHIJKLMNOPQRSTUVWXYZ")
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    // Close the file.
    success = sftp.closeHandle(handle)
    if success != true {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("Success.")

}