/// <summary>
/// 设置屏幕亮度
/// </summary>
/// <param name="handle"></param>
/// <param name="brightness"></param>
/// <returns></returns>
public bool SetBrightness(IntPtr handle, short brightness)
{
handle = Graphics.FromHwnd(IntPtr.Zero).GetHdc();
double value = (double)brightness / 100;
Ramp ramp = default(Ramp);
ramp.Red = new ushort[256];
ramp.Green = new ushort[256];
ramp.Blue = new ushort[256];
for (int i = 1; i < 256; i++)
{
var tmp = (ushort)(i * 255 * value);
ramp.Red[i] = ramp.Green[i] = ramp.Blue[i] = Math.Max(ushort.MinValue, Math.Min(ushort.MaxValue, tmp));
}
var deviceGammaRamp = SetDeviceGammaRamp(handle, ref ramp);
return(deviceGammaRamp);
}
private double CalAllGammaVal(Ramp ramp)
{
return(Math.Round(((CalColorGammaVal(ramp.Blue) + CalColorGammaVal(ramp.Red) +
CalColorGammaVal(ramp.Green)) / 3), 2));
}
public static extern bool SetDeviceGammaRamp(IntPtr hDc, ref Ramp lpRamp);