Serial port lister for OS X in Swift

SerialPortLister.swift

//
//  GetSerialPortList.swift
//  serialTestsIokitSwift
//
//  Created by h on 17/08/2015.
//  Copyright © 2015 h. All rights reserved.
//
//      Simple function returns array of serial port
//      paths as Strings
//






import Foundation
import IOKit
import IOKit.serial

func getSerialPortList() -> [String] {
    var mySerialPortNameArray = [String]()

    var portIterator: io_iterator_t = 0
    let kernResult = findSerialDevices(kIOSerialBSDModemType, serialPortIterator: &portIterator)
    if kernResult == KERN_SUCCESS {
        var serialService: io_object_t
        
        
        
        repeat {
            serialService = IOIteratorNext(portIterator)
            if (serialService != 0) {
                let key: CFString! = "IOCalloutDevice"
                let bsdPathAsCFtring: AnyObject? = IORegistryEntryCreateCFProperty(serialService, key, kCFAllocatorDefault, 0).takeUnretainedValue()
                let bsdPath = String(bsdPathAsCFtring!)
                //serialListButton.addItemWithTitle(bsdPath)
                mySerialPortNameArray.append(bsdPath)
            }
        } while serialService != 0
    }

    
    
    
    
    return mySerialPortNameArray
    
}

func findSerialDevices(deviceType: String, inout serialPortIterator: io_iterator_t ) -> kern_return_t {
    var result: kern_return_t = KERN_FAILURE
    let classesToMatch = IOServiceMatching(kIOSerialBSDServiceValue) //.takeUnretainedValue()
    let classesToMatchCFDictRef = classesToMatch as CFDictionaryRef
    result = IOServiceGetMatchingServices(kIOMasterPortDefault, classesToMatchCFDictRef, &serialPortIterator);
    return result
}