#Requires AutoHotkey v2

Loop {
    ToolTip A_Index
    wnd := Gui()
    if InStr(Format('{:#x}', wnd.hwnd), '0xffffffff') {
        MsgBox Format('{:#x}', wnd.hwnd)
    }
    wnd.Destroy()
}

if DllCall("oleacc\AccessibleObjectFromWindow", "Ptr", hWnd, "UInt", idObject, "Ptr", &IID, "PtrP", pAcc) = 0

if DllCall("oleacc\AccessibleObjectFromWindow", "uptr", hWnd, "UInt", idObject, "Ptr", &IID, "PtrP", pAcc) = 0

ChromeAccObj := GetAccObjFromChrome( WinExist("ahk_class Chrome_WidgetWin_1 ahk_exe chrome.exe") )

ChromeAccObj := GetAccObjFromChrome( WinExist("ahk_class Chrome_WidgetWin_1 ahk_exe chrome.exe", "Chrome Legacy Window") )

F2::
{
	ROLE_SYSTEM_PAGETABLIST := 0x0000003c
	STATE_SYSTEM_SELECTED   := 0x00000002

	ChromeAccObj := GetAccObjFromChrome( WinExist("ahk_class Chrome_WidgetWin_1 ahk_exe chrome.exe") )
	AccTabList := SearchElement(ChromeAccObj, {Role: ROLE_SYSTEM_PAGETABLIST})
	AccTabs := AccTabList.accChild(1)
	tabsCount := activeTabNumber := 0
	Loop % AccTabs.accChildCount()
	{
	   if (AccTabs.accChild(A_Index).accRole(0) = 37)   ; ROLE_SYSTEM_PAGETAB
	   {
	      if (activeTabNumber = 0) and (AccTabs.accChild(A_Index).accState(0) & STATE_SYSTEM_SELECTED)
	         activeTabNumber := A_Index
	      tabsCount++
	   }
	}
	MsgBox, % "Всего вкладок: "    . tabsCount . "`n"
	        . "Активная вкладка: " . activeTabNumber
	Return
}

GetAccObjFromChrome(hWnd) {
   static WM_GETOBJECT := 0x3D, AccArray := []
   if !AccArray[hWnd] {
      try SendMessage, WM_GETOBJECT, 0, 1, Chrome_RenderWidgetHostHWND1, ahk_id %hWnd%
      if !AccChrome := AccObjectFromWindow(hWnd)
         throw "Failed to get accessible object from hWnd " . Format("{:#x}", hWnd)
      AccArray[hWnd] := AccChrome
   }
   Return AccArray[hWnd]
}

AccObjectFromWindow(hWnd, idObject = 0) {
   static IID_IDispatch   := "{00020400-0000-0000-C000-000000000046}"
        , IID_IAccessible := "{618736E0-3C3D-11CF-810C-00AA00389B71}"
        , OBJID_NATIVEOM  := 0xFFFFFFF0, VT_DISPATCH := 9, F_OWNVALUE := 1
        , h := DllCall("LoadLibrary", "Str", "oleacc", "Ptr")
        
   VarSetCapacity(IID, 16), idObject &= 0xFFFFFFFF, AccObject := 0
   DllCall("ole32\CLSIDFromString", "Str", idObject = OBJID_NATIVEOM ? IID_IDispatch : IID_IAccessible, "Ptr", &IID)
   if DllCall("oleacc\AccessibleObjectFromWindow", "Ptr", hWnd, "UInt", idObject, "Ptr", &IID, "PtrP", pAcc) = 0
      AccObject := ComObject(VT_DISPATCH, pAcc, F_OWNVALUE)
   Return AccObject
}

SearchElement(parentElement, params)
{ ; params — object like {Role: ROLE_SYSTEM_PUSHBUTTON := 0x2B, Name: "5"}
   found := true
   for k, v in params {
      try {
         if (k = "State")
            (!(parentElement.accState(0)    & v) && found := false)
         else if (k ~= "^(Name|Value)$")
            (!(parentElement["acc" . k](0) ~= v) && found := false)
         else if (k = "ChildCount")
            (parentElement["acc" . k]      != v  && found := false)
         else
            (parentElement["acc" . k](0)   != v  && found := false)
      }
      catch 
         found := false
   } until !found
   if found
      Return parentElement
   
   for k, v in AccChildren(parentElement)
      if obj := SearchElement(v, params)
         Return obj
}

AccChildren(Acc) {
   if ComObjType(Acc, "Name") != "IAccessible" {
      ErrorLevel := "Invalid IAccessible Object"
      Return
   }
   try childCount := Acc.accChildCount
   if !childCount
      Return
   Children := []
   VarSetCapacity(varChildren, childCount*(8 + A_PtrSize*2), 0)
   res := DllCall("oleacc\AccessibleChildren", "Ptr", ComObjValue(Acc), "Int", 0
                                             , "Int", childCount, "Ptr", &varChildren, "IntP", childCount)
   if (res != 0) {
      ErrorLevel := "winapi AccessibleChildren failed"
      Return
   }
   Loop % childCount  {
      offset := (A_Index - 1)*(A_PtrSize*2 + 8)
      _child := NumGet(varChildren, offset + 8)
      if NumGet(varChildren, offset) != (VT_DISPATCH := 9)
         child := _child
      else
         child := AccQuery(_child), ObjRelease(_child)
      Children.Push(child)
   }
   Return Children
}

AccQuery(Acc) {
   static IAccessible := "{618736e0-3c3d-11cf-810c-00aa00389b71}", VT_DISPATCH := 9, F_OWNVALUE := 1
   try Return ComObject(VT_DISPATCH, ComObjQuery(Acc, IAccessible), F_OWNVALUE)
}