better-genshin-impact/BetterGenshinImpact/Helpers/Device/Resolution.cs

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using BetterGenshinImpact.GameTask;
using BetterGenshinImpact.GameTask.Common;

namespace BetterGenshinImpact.Helpers.Device;

public class Resolution
{
    public int autoWidth = PrimaryScreen.WorkingArea.Width;
    public int autoHeight = PrimaryScreen.WorkingArea.Height;

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public struct DEVMODE
    {
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        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 int dmDisplayOrientation;
        public int 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 short dmLogPixels;
        public short 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;
    }

    // 平台调用的申明
    [DllImport("user32.dll")]
    public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE devMode);

    [DllImport("user32.dll")]
    public static extern int ChangeDisplaySettings(ref DEVMODE devMode, int flags);

    // 控制改变屏幕分辨率的常量
    public const int ENUM_CURRENT_SETTINGS = -1;
    public const int CDS_UPDATEREGISTRY = 0x01;
    public const int CDS_TEST = 0x02;
    public const int DISP_CHANGE_SUCCESSFUL = 0;
    public const int DISP_CHANGE_RESTART = 1;
    public const int DISP_CHANGE_FAILED = -1;

    // 控制改变方向的常量定义
    public const int DMDO_DEFAULT = 0;
    public const int DMDO_90 = 1;
    public const int DMDO_180 = 2;
    public const int DMDO_270 = 3;

    /// <summary>
    /// 修改屏幕分辨率
    /// </summary>
    /// <param name="width">屏幕宽度</param>
    /// <param name="height">屏幕高度</param>
    public void ChangeResolution(int width, int height)
    {
        // 初始化 DEVMODE结构
        DEVMODE devmode = new DEVMODE();
        devmode.dmDeviceName = new String(new char[32]);
        devmode.dmFormName = new String(new char[32]);
        devmode.dmSize = (short)Marshal.SizeOf(devmode);

        if (EnumDisplaySettings(null, ENUM_CURRENT_SETTINGS, ref devmode) != 0)
        {
            devmode.dmPelsWidth = width;
            devmode.dmPelsHeight = height;

            // 改变屏幕分辨率
            int iRet = ChangeDisplaySettings(ref devmode, CDS_TEST);

            if (iRet == DISP_CHANGE_FAILED)
            {
                System.Windows.Forms.MessageBox.Show("不能执行你的请求", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                iRet = ChangeDisplaySettings(ref devmode, CDS_UPDATEREGISTRY);

                switch (iRet)
                {
                    // 成功改变
                    case DISP_CHANGE_SUCCESSFUL:
                    {
                        break;
                    }
                    case DISP_CHANGE_RESTART:
                    {
                        System.Windows.Forms.MessageBox.Show("你需要重新启动电脑设置才能生效", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        break;
                    }
                    default:
                    {
                        System.Windows.Forms.MessageBox.Show($"改变屏幕分辨率失败，目标{width}x{height}，错误码：{iRet}", "信息", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        break;
                    }
                }
            }
        }
    }
}