Determines whether the specified rectangle is empty
_WinAPI_IsRectEmpty ( $tRECT )
|$tRECT||$tagRECT structure that contains the logical coordinates of the rectangle.|
|True:||the rectangle is empty.|
|False:||the rectangle is not empty.|
An empty rectangle is one that has no area; that is, the coordinate of the right side is less than or equal
to the coordinate of the left side, or the coordinate of the bottom side is less than or equal to the
coordinate of the top side.
Search IsRectEmpty in MSDN Library.