AutoIt: Find window under mouse pointer

Question

I'm using AutoIt3 and I need a way for the user to select a window. The fastest method is, in my opinion, having them point to a window. So the question is, how do I see what window is under their mouse pointer?

Answer 1

I extrapolated this from some code I had laying around for selecting areas on the screen. This will just pop up the Window title thats under the mouse (hit Escape to exit the loop):

#include <WinAPI.au3>
#include <Misc.au3>

Func _WindowFromPoint($iX,$iY)
    Local $stInt64,$aRet,$stPoint=DllStructCreate("long;long")
    DllStructSetData($stPoint,1,$iX)
    DllStructSetData($stPoint,2,$iY)
    $stInt64=DllStructCreate("int64",DllStructGetPtr($stPoint))
    $aRet=DllCall("user32.dll","hwnd","WindowFromPoint","int64",DllStructGetData($stInt64,1))
    If @error Then Return SetError(2,@error,0)
    If $aRet[0]=0 Then Return SetError(3,0,0)
    Return $aRet[0]
EndFunc

Local $hControl, $hWin, $hOldWin, $aMousePos
$hOldWin = ""
While Not _IsPressed("1B")
    $aMousePos = MouseGetPos()
    $hControl=_WindowFromPoint($aMousePos[0],$aMousePos[1])
    ; Since _WindowFromPoint() can return 'sub' windows, or control handles, we should seek the owner window
    $hWin=_WinAPI_GetAncestor($hControl,2)
    If $hWin <> $hOldWin Then
        TrayTip("Window Info","Window under mouse = " & WinGetTitle($hWin), 1)
        $hOldWin = $hWin
    EndIf
    Sleep(10)
WEnd