Windows screen brightness fine tune (autohotkey)

brightness.ahk

#,::
  AdjustScreenBrightness(-3)
  Return
  
#.::
  AdjustScreenBrightness(3)
  Return
  
AdjustScreenBrightness(step) {
    service := "winmgmts:{impersonationLevel=impersonate}!\\.\root\WMI"
    monitors := ComObjGet(service).ExecQuery("SELECT * FROM WmiMonitorBrightness WHERE Active=TRUE")
    monMethods := ComObjGet(service).ExecQuery("SELECT * FROM wmiMonitorBrightNessMethods WHERE Active=TRUE")
    minBrightness := 5  ; level below this is identical to this

    for i in monitors {
        curt := i.CurrentBrightness
        break
    }
    if (curt < minBrightness)  ; parenthesis is necessary here
        curt := minBrightness
    toSet := curt + step
    if (toSet > 100)
        return
    if (toSet < minBrightness)
        toSet := minBrightness
        
    

    for i in monMethods {
        i.WmiSetBrightness(1, toSet)
        break
    }
}

Updated Script for AHK v2. I could not get the OS brightness popup to work, So I implemented my own tooltip.

; Brightness Control ;

+WheelDown::
{
  AdjustScreenBrightness(-3)
  return
}

+WheelUp::
{
  AdjustScreenBrightness(3)
  return
}

AdjustScreenBrightness(step) {
    service := "winmgmts:{impersonationLevel=impersonate}!\\.\root\WMI"
    monitors := ComObjGet(service).ExecQuery("SELECT * FROM WmiMonitorBrightness WHERE Active=TRUE")
    monMethods := ComObjGet(service).ExecQuery("SELECT * FROM wmiMonitorBrightNessMethods WHERE Active=TRUE")
    minBrightness := 0

    curt := 0 
    for monitor in monitors {
        curt := monitor.CurrentBrightness
        break
    }
    if (curt < minBrightness) {  
        curt := minBrightness
    }
    toSet := curt + step
    if (toSet > 100) {
        ToolTip "Brightness: 100%"
        return
    }
    if (toSet < minBrightness) {
        toSet := minBrightness
    }

    for method in monMethods {
        method.WmiSetBrightness(1, toSet)
        break
    }
    ToolTip "Brightness: " toSet "%"
    SetTimer RemoveToolTip, -1000  ; Remove tooltip after 1 second
}

RemoveToolTip(){
	ToolTip  ; Clears the tooltip
	return
}

@venturqx, @Rabelaiss
Here is my updated code with windows GUI brightness overlay... working on my Lenovo laptop with Win 10.

#SingleInstance, Force

; Mouse scroll up and down holding shift
+WheelDown::
{
	AdjustScreenBrightness(-10)
	BrightnessOSD()
	return
}

+WheelUp::
{
	AdjustScreenBrightness(10)
	BrightnessOSD()
	return
}

AdjustScreenBrightness(step) {
    service := "winmgmts:{impersonationLevel=impersonate}!\\.\root\WMI"
    monitors := ComObjGet(service).ExecQuery("SELECT * FROM WmiMonitorBrightness WHERE Active=TRUE")
    monMethods := ComObjGet(service).ExecQuery("SELECT * FROM wmiMonitorBrightNessMethods WHERE Active=TRUE")
    minBrightness := 0

    curt := 0 
    for monitor in monitors {
        curt := monitor.CurrentBrightness
        break
    }
    if (curt < minBrightness) {  
        curt := minBrightness
    }
    toSet := curt + step
    if (toSet > 100) {
        return
    }
    if (toSet < minBrightness) {
        toSet := minBrightness
    }

    for method in monMethods {
        method.WmiSetBrightness(1, toSet)
        break
    }
}

BrightnessOSD() {
	static PostMessagePtr := DllCall("GetProcAddress", "Ptr", DllCall("GetModuleHandle", "Str", "user32.dll", "Ptr"), "AStr", A_IsUnicode ? "PostMessageW" : "PostMessageA", "Ptr")
	 ,WM_SHELLHOOK := DllCall("RegisterWindowMessage", "Str", "SHELLHOOK", "UInt")
	static FindWindow := DllCall("GetProcAddress", "Ptr", DllCall("GetModuleHandle", "Str", "user32.dll", "Ptr"), "AStr", A_IsUnicode ? "FindWindowW" : "FindWindowA", "Ptr")
	HWND := DllCall(FindWindow, "Str", "NativeHWNDHost", "Str", "", "Ptr")
	IF !(HWND) {
		try IF ((shellProvider := ComObjCreate("{C2F03A33-21F5-47FA-B4BB-156362A2F239}", "{00000000-0000-0000-C000-000000000046}"))) {
			try IF ((flyoutDisp := ComObjQuery(shellProvider, "{41f9d2fb-7834-4ab6-8b1b-73e74064b465}", "{41f9d2fb-7834-4ab6-8b1b-73e74064b465}"))) {
				DllCall(NumGet(NumGet(flyoutDisp+0)+3*A_PtrSize), "Ptr", flyoutDisp, "Int", 0, "UInt", 0)
				 ,ObjRelease(flyoutDisp)
			}
			ObjRelease(shellProvider)
		}
		HWND := DllCall(FindWindow, "Str", "NativeHWNDHost", "Str", "", "Ptr")
	}
	DllCall(PostMessagePtr, "Ptr", HWND, "UInt", WM_SHELLHOOK, "Ptr", 0x37, "Ptr", 0)
}

If there was a way to adjust the brightness through "hovering the mouse on the top part of screen and then using the mouse wheel", instead of pressing the Shift key on the keyboard while using the mouse wheel would be a great, speedy action and yet more practical to my mind.
Could the current code be written this way? I did not have the knowledge to write it myself :(