Swift

Send StringBuilder Contents over a Socket

Demonstrates Socket.SendSb, which encodes the contents of a StringBuilder using StringCharset and sends the resulting bytes.

Background. Text send and receive operations encode and decode bytes using the StringCharset property. For plain ASCII or UTF-8 protocols, setting StringCharset to utf-8 is a safe default.

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Swift


func chilkatTest() {
    var success: Bool = false

    let socket = CkoSocket()!

    //  Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
    //  connection succeeds; the 4th is the maximum time to wait, in milliseconds.
    var bTls: Bool = true
    var maxWaitMs: Int = 5000
    success = socket.connect(hostname: "example.com", port: 5000, ssl: bTls, maxWaitMs: maxWaitMs)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    //  StringCharset controls the character encoding used when sending and receiving text.
    socket.stringCharset = "utf-8"

    //  Build the text to send in a StringBuilder, then send its contents.
    let sb = CkoStringBuilder()!
    sb.append(value: "SET temperature 21\r\n")

    success = socket.sendSb(sb: sb)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    print("Message sent.")

}