无亮度调节键，PowerShell调亮度脚本快捷键启动卡顿求提速方案

一、优化脚本代码，减少WMI/CIM调用开销 #

原脚本存在重复调用WMI、未处理亮度边界值的问题，优化后可降低开销并避免无效值：

亮度提升脚本： #

# 获取当前亮度并计算新值，限制在0-100区间内
$newBrightness = [Math]::Min(100, (Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightness).CurrentBrightness + 10)
# 用现代CIM替代旧WMI方法，提升调用效率
(Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightnessMethods).WmiSetBrightness(1, $newBrightness)

亮度降低脚本： #

$newBrightness = [Math]::Max(0, (Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightness).CurrentBrightness - 10)
(Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightnessMethods).WmiSetBrightness(1, $newBrightness)

二、后台常驻PowerShell，监听快捷键（彻底消除启动延迟） #

编写一个后台运行的脚本，持续监听快捷键，触发时直接执行调节逻辑，无需每次启动PowerShell：

1. 编写常驻脚本（保存为BrightnessDaemon.ps1）：

Add-Type @"
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public class HotkeyHandler {
    public static event EventHandler BrightnessUp;
    public static event EventHandler BrightnessDown;
    private static IntPtr hookId = IntPtr.Zero;
    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
    private static LowLevelKeyboardProc proc = HookCallback;

    public static void RegisterHotkeys() {
        hookId = SetHook(proc);
        Application.Run();
        UnhookWindowsHookEx(hookId);
    }

    private static IntPtr SetHook(LowLevelKeyboardProc proc) {
        using (var curProcess = System.Diagnostics.Process.GetCurrentProcess())
        using (var curModule = curProcess.MainModule) {
            return SetWindowsHookEx(13, proc, GetModuleHandle(curModule.ModuleName), 0);
        }
    }

    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam) {
        if (nCode >= 0 && wParam == (IntPtr)0x0100) {
            int vkCode = Marshal.ReadInt32(lParam);
            bool ctrl = (GetKeyState(0x11) & 0x8000) != 0;
            bool shift = (GetKeyState(0x10) & 0x8000) != 0;

            if (ctrl && shift && vkCode == 0xBB) {
                BrightnessUp?.Invoke(null, EventArgs.Empty);
                return (IntPtr)1;
            }
            if (ctrl && shift && vkCode == 0xBD) {
                BrightnessDown?.Invoke(null, EventArgs.Empty);
                return (IntPtr)1;
            }
        }
        return CallNextHookEx(hookId, nCode, wParam, lParam);
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UnhookWindowsHookEx(IntPtr hhk);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);

    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true, CallingConvention = CallingConvention.Winapi)]
    private static extern short GetKeyState(int keyCode);
}
"@ -ReferencedAssemblies System.Windows.Forms

# 绑定亮度调节事件
[HotkeyHandler]::BrightnessUp += {
    $newBrightness = [Math]::Min(100, (Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightness).CurrentBrightness + 10)
    (Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightnessMethods).WmiSetBrightness(1, $newBrightness)
}

[HotkeyHandler]::BrightnessDown += {
    $newBrightness = [Math]::Max(0, (Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightness).CurrentBrightness - 10)
    (Get-CimInstance -Namespace root/WMI -ClassName WmiMonitorBrightnessMethods).WmiSetBrightness(1, $newBrightness)
}

# 启动监听
Write-Host "亮度调节后台服务已启动，按Ctrl+C退出"
[HotkeyHandler]::RegisterHotkeys()

2. 设置开机自动启动：

• 按Win+R输入shell:startup打开启动文件夹
• 创建脚本的快捷方式，修改快捷方式目标为：

  powershell.exe -WindowStyle Hidden -ExecutionPolicy Bypass -File "C:\你的脚本路径\BrightnessDaemon.ps1"
  

  开机后脚本会静默后台运行，按下Ctrl+Shift++/Ctrl+Shift+-即可即时调节亮度。

三、将脚本编译为EXE，减少启动时间 #

使用ps2exe工具把PowerShell脚本编译为独立EXE，消除PowerShell启动开销：

1. 安装ps2exe模块：

Install-Module ps2exe -Scope CurrentUser

2. 编译脚本：

ps2exe .\BrightnessUp.ps1 .\BrightnessUp.exe -NoConsole
ps2exe .\BrightnessDown.ps1 .\BrightnessDown.exe -NoConsole

3. 给生成的EXE创建快捷方式并设置快捷键，启动速度会大幅提升。

四、优化快捷方式启动参数 #

如果不想用常驻或编译，直接修改快捷方式的PowerShell启动参数：
将快捷方式目标从powershell.exe -File "C:\脚本路径\BrightnessUp.ps1"改为：

powershell.exe -WindowStyle Hidden -ExecutionPolicy Bypass -NoProfile -Command "& 'C:\脚本路径\BrightnessUp.ps1'"

参数说明：

• -NoProfile：不加载PowerShell配置文件，减少启动耗时
• -WindowStyle Hidden：隐藏窗口，避免渲染开销
• -ExecutionPolicy Bypass：跳过执行策略检查，避免权限阻碍

修改后启动速度可从5秒缩短至1秒左右。

内容的提问来源于stack exchange，提问作者Michiel