using System;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
    unsafe class Program
    {
        [DllImport("user32")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private extern static bool SystemParametersInfo(
            UInt32 uiAction,
            UInt32 uiParam,
            [Out] out UInt32 pvParam,
            UInt32 fWinIni);

        [DllImport("user32")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private extern static bool SystemParametersInfo(
            UInt32 uiAction,
            UInt32 uiParam,
            IntPtr pvParam,
            UInt32 fWinIni);

        [DllImport("user32", EntryPoint = "SystemParametersInfoW")]
        [return: MarshalAs(UnmanagedType.Bool)]
        private extern static bool UnsafeSystemParametersInfo(
            UInt32 uiAction,
            UInt32 uiParam,
            void* pvParam,
            UInt32 fWinIni);

        private const UInt32 SPI_GETFOREGROUNDLOCKTIMEOUT = 0x2000;
        private const UInt32 SPI_SETFOREGROUNDLOCKTIMEOUT = 0x2001;


        static void Main()
        {
            UInt32 oldValue = /* dummy value*/ 5678;
            SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0u, out oldValue, 0u);       // ☆ア
            Console.WriteLine("0x{0:X8} ({0:G})", oldValue);

            // Int32 value32;
            // Int64 value64 = /* dummy value */ 0x1122334455667788;
            // IntPtr p = Marshal.AllocHGlobal(8);
            // Marshal.WriteInt64(p, value64);      // dummy value
            // SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0u, p, 0u);               // ☆イ
            // value64 = Marshal.ReadInt64(p);
            // value32 = Marshal.ReadInt32(p);
            // Console.WriteLine("0x{0:X8} ({0:G}) / 0x{1:X8} ({1:G})", value64, value32);
            // Marshal.FreeHGlobal(p);

            // oldValue = /* dummy value*/ 0xAABBCCDDu;
            // UnsafeSystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0u, &oldValue, 0u); // ☆ウ
            // Console.WriteLine("0x{0:X8} ({0:G})", oldValue);


            // SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0u, (IntPtr)20003, 1u);   //★エ
            // SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0u, (IntPtr)0x579BD, 0u); //★オ
        }
    }
}