User32.cs

using System;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;

namespace KimeraCS
{
    class User32
    {
        internal const string DLLName = "USER32.DLL";

        [StructLayout(LayoutKind.Sequential)]
        public struct DEVMODE
        {
            private const int CCHDEVICENAME = 0x20;
            private const int CCHFORMNAME = 0x20;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmDeviceName;
            public short dmSpecVersion;
            public short dmDriverVersion;
            public short dmSize;
            public short dmDriverExtra;
            public int dmFields;
            public int dmPositionX;
            public int dmPositionY;
            public ScreenOrientation dmDisplayOrientation;
            public int dmDisplayFixedOutput;
            public short dmColor;
            public short dmDuplex;
            public short dmYResolution;
            public short dmTTOption;
            public short dmCollate;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmFormName;
            public short dmLogPixels;
            public int dmBitsPerPel;
            public int dmPelsWidth;
            public int dmPelsHeight;
            public int dmDisplayFlags;
            public int dmDisplayFrequency;
            public int dmICMMethod;
            public int dmICMIntent;
            public int dmMediaType;
            public int dmDitherType;
            public int dmReserved1;
            public int dmReserved2;
            public int dmPanningWidth;
            public int dmPanningHeight;
        }


        [DllImport(DLLName, EntryPoint = "GetDC", SetLastError = true)]
        public static extern IntPtr GetDC(IntPtr hwnd);

        [DllImport(DLLName, EntryPoint = "ReleaseDC")]
        public static extern Int32 ReleaseDC(IntPtr hWnd, IntPtr hDC);

        [return: MarshalAs(UnmanagedType.Bool)]
        [DllImport(DLLName, EntryPoint = "BlockInput", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern void BlockInput([In, MarshalAs(UnmanagedType.Bool)] bool fBlockIt);

        [DllImport(DLLName)]
        public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);


        // FolderBrowserDialogEx
        [DllImport(DLLName, EntryPoint = "SendMessageW")]
        public static extern IntPtr SendMessageW(IntPtr hWnd, uint msg, int wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);
        [DllImport(DLLName, EntryPoint = "FindWindowExW")]
        public static extern IntPtr FindWindowExW(IntPtr hWndParent, IntPtr hWndChildAfter, [MarshalAs(UnmanagedType.LPWStr)] string lpszClass, [MarshalAs(UnmanagedType.LPWStr)] string lpszWindow);
        [DllImport(DLLName, EntryPoint = "GetActiveWindow")]
        public static extern IntPtr GetActiveWindow();
        [DllImport(DLLName, EntryPoint = "SendMessage")]
        public static extern int SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
    }
}