How to read value from slider control? - user-interface

Question

I used simplespy.au3 to target a slider control in the Windows settings window using _UIA_action(). Asking the user to input a value I send left and right keys for the slider to move.
But I don't know how to get the current value of my slider. I tried GUICtrlRead() but it doesn't work. How do I get the current value of a slider control?
My code:
#RequireAdmin
#include <IE.au3>
#include <MsgBoxConstants.au3>
#include <GuiSlider.au3>
#include <GUIConstants.au3>
#include "UISpy\UIAWrappers\UIAWrappers.au3"
Slider()
Func Slider()
;User Input
$Default = ""
$input = ""
While 1
$input = InputBox("Brightness", "Set Brightness to:", "", " M", -1, -1)
If #error Then ExitLoop
If $input < 0 Or $input > 100 Then
MsgBox(48, "Error!", "Minimum value for brightness is 0 and the Maximum brightness is 100")
$Default = $input
ContinueLoop
ElseIf StringLen($input) > 0 Or $input < 100 Then
ExitLoop
EndIf
If #error = 1 Then
Exit
EndIf
WEnd
;Start automation
Local $iTimeout = 1
Local $hWnd = WinWait("[Class:Shell_TrayWnd]", "", "[CLASS:Button; INSTANCE:1]")
ControlClick($hWnd, "", "[CLASS:Button; INSTANCE:1]") ;open the start menu
Send("Display Settings", 10) ;Type the Display Settings in the start menu
Sleep(1000)
Send("{ENTER}")
AutoItSetOption("MustDeclareVars", 1)
Local $oP2 = _UIA_getObjectByFindAll($UIA_oDesktop, "Title:=Settings;controltype:=UIA_WindowControlTypeId;class:=ApplicationFrameWindow", $treescope_children)
_UIA_Action($oP2, "setfocus")
Local $oP1 = _UIA_getObjectByFindAll($oP2, "Title:=Settings;controltype:=UIA_WindowControlTypeId;class:=Windows.UI.Core.CoreWindow", $treescope_children)
_UIA_Action($oP1, "setfocus")
Local $oP0 = _UIA_getObjectByFindAll($oP1, "Title:=;controltype:=UIA_PaneControlTypeId;class:=ScrollViewer", $treescope_children)
;First find the object in the parent before you can do something
; $oUIElement=_UIA_getObjectByFindAll("Changebrightness.mainwindow", "title:=Change brightness;ControlType:=UIA_SliderControlTypeId", $treescope_subtree)
Local $oUIElement = _UIA_getObjectByFindAll($oP0, "title:=Change brightness;ControlType:=UIA_SliderControlTypeId", $treescope_subtree)
_UIA_action($oUIElement, "setfocus")
Send("{LEFT $input}"`enter code here`)
Sleep(1000)
Local $value = GUICtrlRead($oUIElement)
MsgBox($MB_SYSTEMMODAL, "", "Brightness is at: " & $value, $iTimeout)
Local $setValue = GUICtrlSetData($oUIElement, 50)
;UI for verification
MsgBox(0, "Change Brightness", "Brightness Changed.", $iTimeout)
Sleep(1000)
WinClose("Settings") ;Close the active window
EndFunc ;==>Slider

Answer 1

Don't manipulate the slider. Use the WinAPI instead: _WinAPI_SetDeviceGammaRamp.