Retrieves the size of the content area for the background defined by the visual style.
#Include <WinAPIEx.au3>
_WinAPI_GetThemeBackgroundContentRect ( $hTheme, $iPartId, $iStateId, $hDC, $tRECT )
| $hTheme | Handle to a window's specified theme data. |
| $iPartId | The part that contains the content area. |
| $iStateId | The state of the part. |
| $hDC | Handle to the device context to use when drawing. |
| $tRECT | $tagRECT structure that contains the total background rectangle. This is the area inside the borders or margins. |
| Success | $tagRECT structure that contains the content area background rectangle. |
| 失败: | 返回 0 并设置 @error 标志为非 0 值, @extended 标志可能包含一个系统错误代码. |
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