monitor-switcher/NativeMethods.cs at main · flyrobin620/monitor-switcher · GitHub

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using System;
using System.Runtime.InteropServices;

namespace MonitorSwitcher
{
    // All Win32 P/Invoke signatures, structs and constants used by the app.
    internal static class NativeMethods
    {
        // ---- Display enumeration / change (user32) ----
        public const int ENUM_CURRENT_SETTINGS = -1;

        public const uint DM_POSITION = 0x00000020;

        public const uint CDS_UPDATEREGISTRY = 0x00000001;
        public const uint CDS_SET_PRIMARY = 0x00000010;
        public const uint CDS_NORESET = 0x10000000;

        public const uint DISPLAY_DEVICE_ATTACHED_TO_DESKTOP = 0x00000001;
        public const uint DISPLAY_DEVICE_PRIMARY_DEVICE = 0x00000004;
        public const uint DISPLAY_DEVICE_MIRRORING_DRIVER = 0x00000008;

        public const int DISP_CHANGE_SUCCESSFUL = 0;

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern bool EnumDisplayDevices(string lpDevice, uint iDevNum,
            ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);

        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum,
            ref DEVMODE lpDevMode);

        // Overload that passes a DEVMODE by reference (queue a change for one display).
        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, ref DEVMODE lpDevMode,
            IntPtr hwnd, uint dwflags, IntPtr lParam);

        // Overload with a null DEVMODE (used to apply all queued changes at once).
        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
        public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, IntPtr lpDevMode,
            IntPtr hwnd, uint dwflags, IntPtr lParam);

        // ---- Global hotkeys (user32) ----
        public const int WM_HOTKEY = 0x0312;
        public const uint MOD_ALT = 0x0001;
        public const uint MOD_CONTROL = 0x0002;
        public const uint MOD_SHIFT = 0x0004;
        public const uint MOD_WIN = 0x0008;
        public const uint MOD_NOREPEAT = 0x4000;

        [DllImport("user32.dll")]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);

        [DllImport("user32.dll")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        // ---- DPI awareness (user32) ----
        [DllImport("user32.dll")]
        public static extern bool SetProcessDPIAware();

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct DISPLAY_DEVICE
        {
            public int cb;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string DeviceName;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string DeviceString;
            public uint StateFlags;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string DeviceID;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
            public string DeviceKey;
        }

        // DEVMODEW laid out for the *display* branch of its internal union.
        // Total marshaled size must be 220 bytes; dmSize is set to that at runtime.
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        public struct DEVMODE
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string dmDeviceName;
            public ushort dmSpecVersion;
            public ushort dmDriverVersion;
            public ushort dmSize;
            public ushort dmDriverExtra;
            public uint dmFields;

            public int dmPositionX;          // POINTL dmPosition.x
            public int dmPositionY;          // POINTL dmPosition.y
            public uint dmDisplayOrientation;
            public uint dmDisplayFixedOutput;

            public short dmColor;
            public short dmDuplex;
            public short dmYResolution;
            public short dmTTOption;
            public short dmCollate;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string dmFormName;

            public ushort dmLogPixels;
            public uint dmBitsPerPel;
            public uint dmPelsWidth;
            public uint dmPelsHeight;
            public uint dmDisplayFlags;
            public uint dmDisplayFrequency;
            public uint dmICMMethod;
            public uint dmICMIntent;
            public uint dmMediaType;
            public uint dmDitherType;
            public uint dmReserved1;
            public uint dmReserved2;
            public uint dmPanningWidth;
            public uint dmPanningHeight;
        }
    }
}