Is there any method to get system's current brightness in c#

Question

Is there any way to get system's current brightness using c# program. I want to adjust system brightness by c# program. I tried so many ways but they are just for set system brightness and using a predefined value but i want to get current brightness and adjust accordingly. there is the code which i am using but not getting the required result.

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace BrightnessApp
{
public partial class Form1 : Form
{
private int _gammaValue;
private RAMP _ramp;
public Form1()
{
InitializeComponent();
}
public Form1(IContainer container)
{
container.Add(this);
InitializeComponent();
}
[Description("Brightness Gamma Value")]
[Category("Brightness")]
public int SetGammaValue
{
get { return _gammaValue; }
set { _gammaValue = value; }
}
private void Form1_Load(object sender, EventArgs e)
{ 
}
[DllImport("gdi32.dll")]
public static extern bool SetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);
[DllImport("user32.dll")]
private static extern IntPtr GetDC(IntPtr hWnd);
public void ApplyGamma()
{
double gValue = _gammaValue;
gValue = Math.Floor(Convert.ToDouble((gValue / 2.27)));
_gammaValue = Convert.ToInt16(gValue);
if (_gammaValue != 0)
{
_ramp.Red = new ushort[256];
_ramp.Green = new ushort[256];
_ramp.Blue = new ushort[256];
for (int i = 1; i < 256; i++)
{
_ramp.Red[i] = _ramp.Green[i] = _ramp.Blue[i] = (ushort)(Math.Min(65535, Math.Max(0, Math.Pow((i + 1) / 256.0, (_gammaValue + 5) * 0.1) * 65535 + 0.5)));
}
SetDeviceGammaRamp(GetDC(IntPtr.Zero), ref _ramp);
}
}
#region Nested type: RAMP
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct RAMP
{
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)] public UInt16[] Red;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)] public UInt16[] Green;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)] public UInt16[] Blue;
}
#endregion
private void button1_Click(object sender, EventArgs e)
{
_gammaValue += 10;
ApplyGamma();
}
private void button2_Click(object sender, EventArgs e)
{
_gammaValue--;
ApplyGamma();
}
}
}

If you have any better way please let me now. Thanks:)

What is the version of Windows OS you are targeting? – zaitsman Nov 08 '17 at 07:23 — zaitsman, Nov 08 '17 at 07:23
windows 7 and later versions. – Shubham Sharma Nov 08 '17 at 07:26 — Shubham Sharma, Nov 08 '17 at 07:26

score 0 · Answer 1 · answered Nov 08 '17 at 07:26

0

Gamma and Brightness are subtly different things, Gamma is actually more like contrast than brightness. For monitor brightness, you may want to have a look at https://msdn.microsoft.com/en-us/library/windows/desktop/dd692972%28v=vs.85%29.aspx.

answered Nov 08 '17 at 07:26

David Brunning

575
7
18

yes that content was informative but i am using c#. I want to know that can we use c++ method in c#. please help me.......:) – Shubham Sharma Nov 08 '17 at 09:42
In the code sample you posted, you use `[DllImport]` to pinvoke your call to unmanaged components. Do the same with the brightness, just change the call you're making. OR look at the answer to https://stackoverflow.com/questions/18083982/how-to-query-getmonitorbrightness-from-c-sharp - it is specifically about achieving this in C#... Maybe read the replies? – David Brunning Nov 09 '17 at 08:16

Is there any method to get system's current brightness in c#

1 Answers1