SystemParametersInfo Issue

SystemParametersInfoIssue.cs

using System;
using System.Runtime.InteropServices;

namespace CSConsoleApplication1
{
    class Program
    {
        [UnmanagedFunctionPointer(CallingConvention.Winapi)]
        delegate bool SystemParametersInfoDelegate(uint uiAction, uint uiParam, ref uint pvParam, uint fWinIni);

        const uint SPI_GETFOREGROUNDLOCKTIMEOUT = 0x02000;

        static void Main(string[] args)
        {
            var module = Kernel32.LoadLibrary("User32.dll");

            var address = Kernel32.GetProcAddress(module, "SystemParametersInfoW");

            var proc = (SystemParametersInfoDelegate)Marshal.GetDelegateForFunctionPointer(address, typeof(SystemParametersInfoDelegate));

            var value = default(uint);

            var result = proc(SPI_GETFOREGROUNDLOCKTIMEOUT, 0, ref value, 0);

            Console.WriteLine("result={0}, value={1}", result, value);
        }
    }

    static class Kernel32
    {
        [DllImport("Kernel32")]
        public static extern IntPtr LoadLibrary(string dllToLoad);

        [DllImport("Kernel32")]
        public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);

        [DllImport("Kernel32")]
        public static extern bool FreeLibrary(IntPtr hModule);
    }
}