通过NVIDIA驱动程序在显示器上编程设置亮度

本文关键字：编程 设置 亮度 显示器 NVIDIA 驱动程序 通过 | 更新日期: 2023-09-27 18:04:26

我想有可能改变显示器的亮度从一个。net桌面应用程序。(运行在win7和nvidia gpu上)

我发现这个winapi函数:https://msdn.microsoft.com/en-us/library/windows/desktop/dd692972 (v = vs.85) . aspx

有一些SO问题的例子，但调用这个对我没有任何帮助。

但是我发现我的nvidia控制面板允许用滑块调节亮度。

所以我想知道是否有一个API来使用这个功能?如果有人有一些关于如何访问它的示例代码?

通过NVIDIA驱动程序在显示器上编程设置亮度

我用AMD卡运行win7，下面的例子对我有用。SetBrightness期望参数在0-100范围内。我只有一个显示器要测试，所以我只设置第一个显示器的亮度。

using System;
using System.Runtime.InteropServices;
namespace SampleBrightness
{
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct PHYSICAL_MONITOR
    {
        public IntPtr hPhysicalMonitor;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
        public string szPhysicalMonitorDescription;
    }
    public class BrightnessController : IDisposable
    {
        [DllImport("user32.dll", EntryPoint = "MonitorFromWindow")]
        public static extern IntPtr MonitorFromWindow([In] IntPtr hwnd, uint dwFlags);
        [DllImport("dxva2.dll", EntryPoint = "DestroyPhysicalMonitors")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool DestroyPhysicalMonitors(uint dwPhysicalMonitorArraySize, ref PHYSICAL_MONITOR[] pPhysicalMonitorArray);
        [DllImport("dxva2.dll", EntryPoint = "GetNumberOfPhysicalMonitorsFromHMONITOR")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetNumberOfPhysicalMonitorsFromHMONITOR(IntPtr hMonitor, ref uint pdwNumberOfPhysicalMonitors);
        [DllImport("dxva2.dll", EntryPoint = "GetPhysicalMonitorsFromHMONITOR")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetPhysicalMonitorsFromHMONITOR(IntPtr hMonitor, uint dwPhysicalMonitorArraySize, [Out] PHYSICAL_MONITOR[] pPhysicalMonitorArray);
        [DllImport("dxva2.dll", EntryPoint = "GetMonitorBrightness")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetMonitorBrightness(IntPtr handle, ref uint minimumBrightness, ref uint currentBrightness, ref uint maxBrightness);
        [DllImport("dxva2.dll", EntryPoint = "SetMonitorBrightness")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetMonitorBrightness(IntPtr handle, uint newBrightness);
        private uint _physicalMonitorsCount = 0;
        private PHYSICAL_MONITOR[] _physicalMonitorArray;
        private IntPtr _firstMonitorHandle;
        private uint _minValue = 0;
        private uint _maxValue = 0;
        private uint _currentValue = 0;
        public BrightnessController(IntPtr windowHandle)
        {
            uint dwFlags = 0u;
            IntPtr ptr = MonitorFromWindow(windowHandle, dwFlags);
            if (!GetNumberOfPhysicalMonitorsFromHMONITOR(ptr, ref _physicalMonitorsCount))
            {
                throw new Exception("Cannot get monitor count!");
            }
            _physicalMonitorArray = new PHYSICAL_MONITOR[_physicalMonitorsCount];
            if (!GetPhysicalMonitorsFromHMONITOR(ptr, _physicalMonitorsCount, _physicalMonitorArray))
            {
                throw new Exception("Cannot get phisical monitor handle!");
            }
            _firstMonitorHandle = _physicalMonitorArray[0].hPhysicalMonitor;
            if (!GetMonitorBrightness(_firstMonitorHandle, ref _minValue, ref _currentValue, ref _maxValue))
            {
                throw new Exception("Cannot get monitor brightness!");
            }
        }    
        public void SetBrightness(int newValue)
        {
            newValue = Math.Min(newValue, Math.Max(0, newValue));
            _currentValue = (_maxValue - _minValue) * (uint)newValue / 100u + _minValue;
            SetMonitorBrightness(_firstMonitorHandle, _currentValue);
        }
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (_physicalMonitorsCount > 0)
                {
                    DestroyPhysicalMonitors(_physicalMonitorsCount, ref _physicalMonitorArray);
                }
            }
        }
    }
}

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