DDCMonitorManager/Native.cs

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

namespace DDCMonitorManager
{
    class NativeCalls
    {
        [DllImport("user32.dll", EntryPoint = "MonitorFromWindow", SetLastError = true)]
        public static extern IntPtr MonitorFromWindow(
            [In] IntPtr hwnd, uint dwFlags);

        [DllImport("dxva2.dll", EntryPoint = "GetNumberOfPhysicalMonitorsFromHMONITOR", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetNumberOfPhysicalMonitorsFromHMONITOR(
            IntPtr hMonitor, ref uint pdwNumberOfPhysicalMonitors);

        [DllImport("dxva2.dll", EntryPoint = "GetPhysicalMonitorsFromHMONITOR", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetPhysicalMonitorsFromHMONITOR(
            IntPtr hMonitor,
            uint dwPhysicalMonitorArraySize,
            [Out] NativeStructures.PHYSICAL_MONITOR[] pPhysicalMonitorArray);

        [DllImport("dxva2.dll", EntryPoint = "DestroyPhysicalMonitors", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool DestroyPhysicalMonitors(
            uint dwPhysicalMonitorArraySize, [Out] NativeStructures.PHYSICAL_MONITOR[] pPhysicalMonitorArray);

        [DllImport("dxva2.dll", EntryPoint = "GetMonitorTechnologyType", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetMonitorTechnologyType(
            IntPtr hMonitor, ref NativeStructures.MC_DISPLAY_TECHNOLOGY_TYPE pdtyDisplayTechnologyType);

        [DllImport("dxva2.dll", EntryPoint = "GetMonitorCapabilities", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetMonitorCapabilities(
            IntPtr hMonitor, ref uint pdwMonitorCapabilities, ref uint pdwSupportedColorTemperatures);

        [DllImport("dxva2.dll", EntryPoint = "SetMonitorBrightness", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetMonitorBrightness(
            IntPtr hMonitor, short brightness);

        [DllImport("dxva2.dll", EntryPoint = "GetMonitorBrightness", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetMonitorBrightness(
            IntPtr hMonitor, ref short pdwMinimumBrightness, ref short pdwCurrentBrightness, ref short pdwMaximumBrightness);
    }
    public class NativeConstants
    {
        public const int MONITOR_DEFAULTTOPRIMARY = 1;

        public const int MONITOR_DEFAULTTONEAREST = 2;

        public const int MONITOR_DEFAULTTONULL = 0;
    }

    public class NativeStructures
    {
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct PHYSICAL_MONITOR
        {
            public IntPtr hPhysicalMonitor;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string szPhysicalMonitorDescription;
        }

        public enum MC_DISPLAY_TECHNOLOGY_TYPE
        {
            MC_SHADOW_MASK_CATHODE_RAY_TUBE,

            MC_APERTURE_GRILL_CATHODE_RAY_TUBE,

            MC_THIN_FILM_TRANSISTOR,

            MC_LIQUID_CRYSTAL_ON_SILICON,

            MC_PLASMA,

            MC_ORGANIC_LIGHT_EMITTING_DIODE,

            MC_ELECTROLUMINESCENT,

            MC_MICROELECTROMECHANICAL,

            MC_FIELD_EMISSION_DEVICE,
        }
    }
}