Retrieves the coordinates of the rectangle that completely encloses the update region of the specified window
#include <WinAPIGdi.au3>
_WinAPI_GetUpdateRect ( $hWnd [, $bErase = True] )
| $hWnd | Handle to the window whose update region is to be retrieved. |
| $bErase | [optional] Specifies whether the background in the update region is to be erased, valid values: True - The background is erased (Default). False - The background remains unchanged. |
| Success: | $tagRECT structure that contains the coordinates of the enclosing rectangle, in device units. |
| Failure: | Sets the @error flag to non-zero. |
The update rectangle retrieved by the _WinAPI_BeginPaint() function is identical to that retrieved by
_WinAPI_GetUpdateRect()
_WinAPI_BeginPaint() automatically validates the update region, so any call to _WinAPI_GetUpdateRect() made
immediately after the call to _WinAPI_BeginPaint() retrieves an empty update region.
Search GetUpdateRect in MSDN Library.