Lite leksaker till Salim

Program.cs

using System;
using System.Runtime.InteropServices;

namespace SalimsLekstuga
{
    class Program
    {
        static void Main(string[] args)
        {
            var lek = new SalimsLeksak();
            Console.WriteLine(lek.DeviceInfo.InstalledMemory);
            lek.TunePlayer.PlayTune();
            Console.ReadKey();
        }
    }
        
    public class SalimsLeksak
    {
        public TunePlayerImpl TunePlayer = new TunePlayerImpl();
        public DevInfoImpl DeviceInfo = new DevInfoImpl();

        public class TunePlayerImpl
        {
            [DllImport("kernel32")]
            static extern bool Beep(UInt32 frequency, UInt32 duration);

            public void PlayTune()
            {
                Beep(Tones.C4, ToneLenths.Full);
                Beep(Tones.C4, ToneLenths.Full);
                Beep(Tones.C4, ToneLenths.Full);
                Beep(Tones.E4, ToneLenths.Full);

                Beep(Tones.D4, ToneLenths.Full);
                Beep(Tones.D4, ToneLenths.Full);
                Beep(Tones.D4, ToneLenths.Full);
                Beep(Tones.F4, ToneLenths.Full);

                Beep(Tones.E4, ToneLenths.Full);
                Beep(Tones.E4, ToneLenths.Full);
                Beep(Tones.D4, ToneLenths.Full);
                Beep(Tones.D4, ToneLenths.Full);

                Beep(Tones.C4, ToneLenths.Quarter);

            }

            public void Beep(int tone, int length)
            {
                Beep(tone, length);
            }

            public static class ToneLenths
            {
                public static UInt32 Quarter = 2000;
                public static UInt32 Full = 500;
                public static UInt32 Half = 250;
            }

            public static class Tones
            {
                public static UInt32 C4 = 261;
                public static UInt32 D4 = 293;
                public static UInt32 E4 = 329;
                public static UInt32 F4 = 349;
                public static UInt32 G4 = 392;
                public static UInt32 A4 = 440;
                public static UInt32 B4 = 493;
                public static UInt32 C5 = 523;

            }

        }

        public class DevInfoImpl
        {
            // http://www.geoffchappell.com/studies/windows/win32/kernel32/api/

            [DllImport("kernel32")]
            [return: MarshalAs(UnmanagedType.Bool)]
            static extern bool GetPhysicallyInstalledSystemMemory(out long TotalMemoryInKilobytes);

            public string InstalledMemory
            {
                get
                {
                    GetPhysicallyInstalledSystemMemory(out long memKb);
                    var gb = (memKb / 1024 / 1024);
                    return $"{gb} GB of RAM installed.";
                }
            }

        }

    }

}