CRect::IsRectEmpty
Determines whether CRect is empty.
BOOL IsRectEmpty( ) const throw( );
Return Value
Nonzero if CRect is empty; 0 if CRect is not empty.
Remarks
A rectangle is empty if the width and/or height are 0 or negative. Differs from IsRectNull, which determines whether all coordinates of the rectangle are zero.
备注
The rectangle must be normalized or this function may fail. You can call NormalizeRect to normalize the rectangle before calling this function.
Example
CRect rectNone(0, 0, 0, 0);
CRect rectSome(35, 50, 135, 150);
ASSERT(rectNone.IsRectEmpty());
ASSERT(!rectSome.IsRectEmpty());
CRect rectEmpty(35, 35, 35, 35);
ASSERT(rectEmpty.IsRectEmpty());
Requirements
Header: atltypes.h