Swift

Poll a Socket for Available Data

Demonstrates Socket.PollDataAvailable, which performs a nonblocking check for readable activity and returns whether data or another read-ready condition is present.

Background. This lets an application check for incoming data without blocking, for example in an event loop that services multiple tasks.

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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
    }

    //  Perform a nonblocking check for readable data.  Returns true when data or another read-ready
    //  condition is present, and false when nothing is immediately available.
    var bAvailable: Bool = socket.pollDataAvailable()
    if bAvailable != true {
        print("No data is immediately available.")
    }
    else {
        print("Data is available to read.")
    }


}