import Foundation

let name: String = "my name"
let age: UInt32 = 100
let myData: Data = "helloworld".data(using: .utf8)!
let properties: [String: Any] = [
    "name": name,
    "age": age,
    "data": myData
]

do {
    // pack
    let packedData = try PropertyListSerialization.data(fromPropertyList: properties, format: .binary, options: 0)
 
    // unpack
    let unpackedProps = try PropertyListSerialization.propertyList(from: packedData, options: [], format: nil)
 
    guard let newProperties = unpackedProps as? [String: Any] else {
        fatalError("error: not a dictionary type")
    }


    for item in newProperties {
        print("# \(item.key) => \(item.value)")
    }

    print("name:", newProperties["name"] as! String)
    print("age:", newProperties["age"] as! UInt32)
    print("data:", String(data: newProperties["data"] as! Data, encoding: .utf8)!)
 
} catch {
    print("serialize message error: \(error)")
    exit(0)
}

$ ~/swift-4.2.4-RELEASE-ubuntu18.04/usr/bin/swift sr-8115.swift
# age => 100
# name => my name
# data => 10 bytes
name: my name
age: 100
data: helloworld