Retrieves the x-extent and y-extent of the window for the specified device context.
#Include <WinAPIEx.au3>
_WinAPI_GetWindowExt ( $hDC )
| $hDC | Handle to the device context. |
| Success | $tagSIZE structure that contains the x- and y-extents in page-space units, that is, logical units. |
| 失败: | 返回 0 并设置 @error 标志为非 0 值. |
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