Determines which, if any, of the child windows belonging to the specified parent window contains the specified point
#include <WinAPISysWin.au3>
_WinAPI_ChildWindowFromPointEx ( $hWnd, $tPOINT [, $iFlags = 0] )
| $hWnd | Handle to the parent window. |
| $tPOINT | $tagPOINT structure that defines the client coordinates (relative to hwndParent) of the point to be checked. |
| $iFlags | [optional] The flags that specify which child windows to skip. This parameter can be one or more of the following values: $CWP_ALL (Default) $CWP_SKIPINVISIBLE $CWP_SKIPDISABLED $CWP_SKIPTRANSPARENT |
| Success: | Handle to the first child window. If the point is within the parent window but not within any child window that meets the criteria, the return value is a handle to the parent window. If the point lies outside the parent window, the return value is 0. |
| Failure: | 0. |
The system maintains an internal list that contains the handles of the child windows associated with a parent window.
The order of the handles in the list depends on the Z order of the child windows.
If more than one child window contains the specified point, the system returns a handle to the first window in the list that contains the point and meets the criteria specified by $iFlags.
Search ChildWindowFromPointEx in MSDN Library.