CRect::IsRectNull

BOOLIsRectNull()const;

Return Value

Nonzero if CRect’s top, left, bottom, and right values are all equal to 0; otherwise 0.

Remarks

Determines whether the top, left, bottom, and right values of CRect are all equal to 0. Differs from IsRectEmpty, which determines whether the rectangle is empty.

Example

CRect rectNone(0, 0, 0, 0);
CRect rectSome(35, 50, 135, 150);

ASSERT(rectNone.IsRectNull());
ASSERT(!rectSome.IsRectNull());

// note that null means _all_ zeros

CRect rectNotNull(0, 0, 35, 50);
ASSERT(!rectNotNull.IsRectNull());

CRect Overview |  Class Members |  Hierarchy Chart

See Also   CRect::IsRectEmpty, CRect::SetRectEmpty