Imports System Imports System.Runtime.InteropServices Module ScreenBrightnessAdjustement <DllImport("user32")> _ Private Function GetDC(ByVal Handle As IntPtr) As IntPtr End Function <DllImport("user32")> _ Private Function ReleaseDC(ByVal Handle As IntPtr, ByVal DeviceContext As IntPtr) As Integer End Function <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi)> _ Private Structure RAMP <MarshalAs(UnmanagedType.ByValArray, SizeConst:=256)> Public Red() As UShort <MarshalAs(UnmanagedType.ByValArray, SizeConst:=256)> Public Green() As UShort <MarshalAs(UnmanagedType.ByValArray, SizeConst:=256)> Public Blue() As UShort End Structure <DllImport("gdi32")> _ Private Function GetDeviceGammaRamp(ByVal DeviceContext As IntPtr, ByRef lpv As RAMP) As Integer End Function <DllImport("gdi32")> _ Private Function SetDeviceGammaRamp(ByVal DeviceContext As IntPtr, ByRef lpv As RAMP) As Integer End Function Public Function GetBrightness() As Byte Dim Brightness As Byte = 0 Dim gammaDC As IntPtr = GetDC(IntPtr.Zero) If Not gammaDC = IntPtr.Zero Then Dim gammaArray As RAMP = New RAMP() Call GetDeviceGammaRamp(gammaDC, gammaArray) Brightness = CByte(gammaArray.Red(1) - 128) End If Call ReleaseDC(IntPtr.Zero, gammaDC) Return Brightness End Function Public Sub SetBrightness(ByVal Brightness As Byte) Dim gammaDC As IntPtr = GetDC(IntPtr.Zero) If Not gammaDC = IntPtr.Zero Then Dim gammaArray As RAMP = New RAMP() gammaArray.Red = CType(Array.CreateInstance(GetType(UShort), 256), UShort()) gammaArray.Green = CType(Array.CreateInstance(GetType(UShort), 256), UShort()) gammaArray.Blue = CType(Array.CreateInstance(GetType(UShort), 256), UShort()) For i As Int16 = 0 To 255 Dim arrayValue As UShort = CUShort(Math.Min(i * (Brightness + 128), UShort.MaxValue)) gammaArray.Red(i) = arrayValue gammaArray.Green(i) = arrayValue gammaArray.Blue(i) = arrayValue Next i Call SetDeviceGammaRamp(gammaDC, gammaArray) End If Call ReleaseDC(IntPtr.Zero, gammaDC) End Sub End Module
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