Get Serial Number from macOS as String

getSerialnumber.swift

// 
//  getSerialnumber.swift
// 
//  Created by Francois 'ftiff' Levaux-Tiffreau on 18.07.16.
//  Licence = MIT (https://tldrlegal.com/license/mit-license)

/*
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 * DEALINGS IN THE SOFTWARE.
*/

import Foundation
import IOKit

func getSerialNumber() -> String {
    let platformExpert = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"))
    
        let serialNumberAsCFString = IORegistryEntryCreateCFProperty(platformExpert, kIOPlatformSerialNumberKey, kCFAllocatorDefault, 0)
    let serial = serialNumberAsCFString.takeRetainedValue() as! String
    IOObjectRelease(platformExpert)
    
    return serial
}