Swift

Send a 16-bit Integer over a Socket

Demonstrates Socket.SendInt16, which sends the low 16 bits of a value as a two-byte integer in the selected byte order.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

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Swift


func chilkatTest() {
    var success: Bool = false

    let socket = CkoSocket()!

    //  Connect to the server using TLS.
    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
    }

    //  Send the low 16 bits of the value as a two-byte integer.  Use true for network byte order
    //  (big-endian) or false for little-endian.
    var bBigEndian: Bool = true
    success = socket.sendInt16(value: 1024, bigEndian: bBigEndian)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    print("16-bit integer sent.")

}