Github: https://github.com/CHNMaxGor/AjustScreenBrightness

	 

	方法一: 使用网上常说的 Gdi32.dll 下的 SetDeviceGammaRamp (修改系统Gamma)

	
DllImport("gdi32.dll")]
public static extern bool GetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);


	
[DllImport("gdi32.dll")]
public static extern bool SetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);


	方法二: 使用MSDN上的 dxva2.dll SetMonitorBrightness

	

		
	
 1 [DllImport("dxva2.dll")]
 2 public static extern bool GetNumberOfPhysicalMonitorsFromHMONITOR(IntPtr hMonitor, ref uint pdwNumberOfPhysicalMonitors);
 3 
 4 [DllImport("dxva2.dll")]
 5 public static extern bool GetPhysicalMonitorsFromHMONITOR(IntPtr hMonitor,
 6                 uint dwPhysicalMonitorArraySize, [Out] PhysicalMonitor[] pPhysicalMonitorArray);
 7 
 8 [DllImport("dxva2.dll")]
 9 public static extern bool DestroyPhysicalMonitors(uint dwPhysicalMonitorArraySize,
10                 [Out] PhysicalMonitor[] pPhysicalMonitorArray);
11 
12 [DllImport("dxva2.dll")]
13 public static extern bool GetMonitorTechnologyType(IntPtr hMonitor,
14                 ref McDisplayTechnologyType pdtyDisplayTechnologyType);
15 
16 [DllImport("dxva2.dll")]
17 public static extern bool GetMonitorCapabilities(IntPtr hMonitor, ref uint pdwMonitorCapabilities,
18                 ref uint pdwSupportedColorTemperatures);
19 
20 [DllImport("dxva2.dll")]
21 public static extern bool SetMonitorBrightness(IntPtr hMonitor, short brightness);
22 
23 [DllImport("dxva2.dll")]
24 public static extern bool SetMonitorContrast(IntPtr hMonitor, short contrast);
25 
26 [DllImport("dxva2.dll")]
27 public static extern bool GetMonitorBrightness(IntPtr hMonitor, ref short pdwMinimumBrightness,
28                 ref short pdwCurrentBrightness, ref short pdwMaximumBrightness);
29 
30 [DllImport("dxva2.dll")]
31 public static extern bool GetMonitorContrast(IntPtr hMonitor, ref short pwdMinimumContrast,
32                 ref short pwdCurrentContrast, ref short pwdMaximumContrast);
	

		


	 

	方法三: 使用 C:\Windows\System32\DriverStore\FileRepository\igdlh64.inf_amd64_neutral_3daeca3838e011e0\igfxDHLib.dll (这是驱动的文件,不同机器有自己对应的驱动文件)

	
DataHandlerClass _cls = new DataHandlerClass();
_CUI_COLOR_DEVICES _screenModel = default(_CUI_COLOR_DEVICES);

public AjustScreenByIgfxDHLib()
{
    CUI_SUPPORTED_CONFIG cui_SUPPORTED_CONFIG = default(CUI_SUPPORTED_CONFIG);
    uint num = _cls.get_SupportedConfig(ref cui_SUPPORTED_CONFIG);
    var id = cui_SUPPORTED_CONFIG.DeviceConfig[0].DispDev[0];
    uint[] array = new uint[3];
    var a = _cls.get_GetDeviceList(id, array);
    _screenModel.ulDevices = array[0];
    _screenModel.Device = new _CUI_COLOR_INFO[3];
    _screenModel.Device[0].Brightness.color = _COLOR_TYPE.NumColors;
    _screenModel.Device[0].Contrast.color = _COLOR_TYPE.NumColors;
    _screenModel.Device[0].Gamma.color = _COLOR_TYPE.NumColors;
    _screenModel.Command = _CUI_COLOR_COMMAND.GET_COLOR;
    _cls.get_color(_screenModel.ulDevices, ref _screenModel);
}



	　　

	注意事项 该方法使用时请注意好参数的范围,比如说把对比度设置太低时屏幕会完全黑掉 什么都看不到,然后你就不能直接把对比度调回来了.