C#中，如何调节屏幕亮度？

[周麻子叔叔]

如图，最近在做一个工程，接触到了要调节亮度，在网上看到了用调节伽马的方法，但我用了过后屏幕出现问题，如果有谁知道的请告诉我怎么做，谢谢！

[kellerman616]

微软自身的有控制屏幕亮度的API，确实是调用SetDeviceGammaRamp()这个函数。这里有个很详细的图文教程你可看看：http://bit.ly/2EkTArr 新建一个窗体应用，拖一个滑条和一个按钮。代码发给你你可以试试：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
using System.Runtime.InteropServices; 
namespace brightnesscontrol 
{ 
   public partial class Form1 : Form 
   { 
       [DllImport("gdi32.dll")] 
       private unsafe static extern bool SetDeviceGammaRamp(Int32 hdc, void* ramp); 
       private static bool initialized = false; 
       private static Int32 hdc; 
       private static int a; 
       public Form1() 
       { 
           InitializeComponent(); 
       } 
       private static void InitializeClass() 
       { 
           if (initialized) 
               return; 
           hdc = Graphics.FromHwnd(IntPtr.Zero).GetHdc().ToInt32(); 
           initialized = true; 
       } 
       public static unsafe bool SetBrightness(int brightness) 
       { 
           InitializeClass(); 
           if (brightness > 255) 
               brightness = 255; 
           if (brightness < 0) 
               brightness = 0; 
           short* gArray = stackalloc short[3 * 256]; 
           short* idx = gArray; 
           for (int j = 0; j < 3; j++) 
           { 
               for (int i = 0; i < 256; i++) 
               { 
                   int arrayVal = i * (brightness + 128); 
                   if (arrayVal > 65535) 
                       arrayVal = 65535; 
                   *idx = (short)arrayVal; 
                   idx++; 
               } 
           } 
           bool retVal = SetDeviceGammaRamp(hdc, gArray); 
           return retVal; 
       } 
       private void trackBar1_Scroll(object sender, EventArgs e) 
       { 
       } 
       private void button1_Click(object sender, EventArgs e) 
       { 
           a = trackBar1.Value; 
           SetBrightness(a); 
       } 
   } 
}

你把滑条的值改一改试试看

[zlxd19]

也碰到同样的问题 mark

[非专业开发Five]

lz不结贴感觉好不厚道

[tansion2015]

引用 1 楼 kellerman616 的回复:

微软自身的有控制屏幕亮度的API，确实是调用SetDeviceGammaRamp()这个函数。这里有个很详细的图文教程你可看看：http://bit.ly/2EkTArr 新建一个窗体应用，拖一个滑条和一个按钮。代码发给你你可以试试：

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
using System.Runtime.InteropServices; 
namespace brightnesscontrol 
{ 
   public partial class Form1 : Form 
   { 
       [DllImport("gdi32.dll")] 
       private unsafe static extern bool SetDeviceGammaRamp(Int32 hdc, void* ramp); 
       private static bool initialized = false; 
       private static Int32 hdc; 
       private static int a; 
       public Form1() 
       { 
           InitializeComponent(); 
       } 
       private static void InitializeClass() 
       { 
           if (initialized) 
               return; 
           hdc = Graphics.FromHwnd(IntPtr.Zero).GetHdc().ToInt32(); 
           initialized = true; 
       } 
       public static unsafe bool SetBrightness(int brightness) 
       { 
           InitializeClass(); 
           if (brightness > 255) 
               brightness = 255; 
           if (brightness < 0) 
               brightness = 0; 
           short* gArray = stackalloc short[3 * 256]; 
           short* idx = gArray; 
           for (int j = 0; j < 3; j++) 
           { 
               for (int i = 0; i < 256; i++) 
               { 
                   int arrayVal = i * (brightness + 128); 
                   if (arrayVal > 65535) 
                       arrayVal = 65535; 
                   *idx = (short)arrayVal; 
                   idx++; 
               } 
           } 
           bool retVal = SetDeviceGammaRamp(hdc, gArray); 
           return retVal; 
       } 
       private void trackBar1_Scroll(object sender, EventArgs e) 
       { 
       } 
       private void button1_Click(object sender, EventArgs e) 
       { 
           a = trackBar1.Value; 
           SetBrightness(a); 
       } 
   } 
}

你把滑条的值改一改试试看

这个只是调节对比度或者屏幕颜色，压根不是调亮度，用过，不好用。

[八爻老骥]

试试这个，使用控制面板接口控制屏幕亮度。
IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS control code (Ntddvdeo.h) - Win32 apps | Microsoft Docs
https://docs.microsoft.com/en-us/windows/win32/power/ioctl-video-set-display-brightness

BOOL DeviceIoControl(
  (HANDLE) hDevice,            // handle to device
  IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS, // dwIoControlCode
  (LPVOID) lpInBuffer,         // input buffer
  (DWORD) nInBufferSize,       // size of the input buffer
  NULL,                        // lpOutBuffer
  0,                           // nOutBufferSize 
  (LPDWORD) lpBytesReturned,   // number of bytes returned
  (LPOVERLAPPED) lpOverlapped  // OVERLAPPED structure
);

[JDD1997]

windows应该没有提供这种功能, 有些显示器的厂家在windows下的控制软件可以调整包括亮度在内的各种参数,但应该都是通过私有协议完成的.

[飞天凤凰601]

收藏，好内容！

[yjchang]

引用 6 楼 JDD1997 的回复:

windows应该没有提供这种功能,
有些显示器的厂家在windows下的控制软件可以调整包括亮度在内的各种参数,但应该都是通过私有协议完成的.

Windows有API， 如楼上所说，就是使用DeviceIoControl。但只能调节内置笔记本的panel，外接显示器是没有这个接口的。