电脑控制面板调节亮度c++代码

using System;
using System.Windows.Forms;
using System.Management;
using System.Runtime.InteropServices;
namespace brightness
{
    static class Program
    {
        private static IntPtr hdc;
        private static byte CurrentBrightness;
        [DllImport("user32.dll")]
        private static extern IntPtr GetDC(IntPtr hWnd);
        [DllImport("user32")]
        private static extern IntPtr SendMessage(IntPtr hWnd, uint wMsg, uint wParam, int lParam);
        [DllImport("gdi32.dll")]
        private unsafe static extern bool SetDeviceGammaRamp(IntPtr hdc, void* ramp);
        [STAThread]
        static void Main()
        {
            hdc = GetDC(IntPtr.Zero);
            CurrentBrightness = GetBrightness();
            SetBrightness(CurrentBrightness);
            System.Timers.Timer timer1=new System.Timers.Timer();;
            timer1.Enabled = true;
            timer1.Interval = 1;
            timer1.Elapsed = new System.Timers.ElapsedEventHandler(timer1_Elapsed);
            System.Timers.Timer timer2 = new System.Timers.Timer(); ;
            timer2.Enabled = true;
            timer2.Interval = 1000;
            timer2.Elapsed = new System.Timers.ElapsedEventHandler(timer2_Elapsed);
            Application.Run();
        }
        static void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            byte k = GetBrightness();
            if (CurrentBrightness != k)
            {
                SetBrightness(k);
                CurrentBrightness = k;
            }
        }
        static void timer2_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            SetBrightness(GetBrightness());
        }
        static byte GetBrightness()
        {
            ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\wmi");
            ObjectQuery query = new ObjectQuery("Select * from WmiMonitorBrightness");
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
            foreach (ManagementObject m in searcher.Get())
            {
                
                 return (byte)m["CurrentBrightness"];
            }
            return (byte)0x64;
        }
        public static unsafe bool SetBrightness(byte brightness)
        {
            short* gArray = stackalloc short[3 * 256];
            short* idx = gArray;
            for (int j = 0; j < 3; j )
            {
                for (int i = 0; i < 256; i )
                {
                    int k = i * (50 brightness / 2) * 256 / 100;
                    *idx = (short)(k < 32768 ? k : k - 65536);
                    idx ;
                }
            }
            return SetDeviceGammaRamp(hdc, gArray);
        }
    }
}