src/Carnac.Logic/ScreenManager.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using Carnac.Logic.Native;

namespace Carnac.Logic
{
    public class ScreenManager : IScreenManager
    {
        [DllImport("user32.dll")]
        private static extern bool EnumDisplayDevices(string lpDevice, uint iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);

        [DllImport("User32.dll")]
        private static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);

        public IEnumerable<DetailedScreen> GetScreens()
        {
            var screens = new List<DetailedScreen>();

            int index = 1;
            var d = new DISPLAY_DEVICE();
            d.cb = Marshal.SizeOf(d);
            try
            {
                for (uint id = 0; EnumDisplayDevices(null, id, ref d, 0); id++)
                {
                    d.cb = Marshal.SizeOf(d);

                    var x = new DISPLAY_DEVICE();
                    x.cb = Marshal.SizeOf(x);

                    //Get the actual monitor
                    EnumDisplayDevices(d.DeviceName, 0, ref x, 0);

                    if (string.IsNullOrEmpty(x.DeviceName) || string.IsNullOrEmpty(x.DeviceString))
                        continue;

                    var screen = new DetailedScreen { FriendlyName = x.DeviceString, Index = index++ };

                    var mode = new DEVMODE();
                    mode.dmSize = (ushort)Marshal.SizeOf(mode);
                    if (EnumDisplaySettings(d.DeviceName, -1, ref mode))
                    {
                        screen.Width = (int)mode.dmPelsWidth;
                        screen.Height = (int)mode.dmPelsHeight;
                        screen.Top = mode.dmPosition.y;
                        screen.Left = mode.dmPosition.x;
                    }

                    screens.Add(screen);
                }
            }
            catch (Exception)
            {
                //log this
            }

            var biggestScreen = screens.OrderByDescending(s => s.Width).FirstOrDefault();
            if (biggestScreen != null)