method increments the reference count for a the calling interface on an
object. It should be called for every new copy of a pointer to an interface on a
Returns an integer from 1 to n, the value of the new reference count. This
information is meant to be used for diagnostic/testing purposes only, because, in
certain situations, the value may be unstable.
Objects use a reference counting mechanism to ensure that the lifetime of the
object includes the lifetime of references to it. You use IUnknown::AddRef
to stabilize a copy of an interface pointer. It can also be called when the
life of a cloned pointer must extend beyond the lifetime of the original
pointer. The cloned pointer must be released by calling IUnknown::Release.
Objects must be able to maintain (2 (31) )-1 outstanding pointer references. Therefore, the internal reference counter
maintains must be a 32-bit unsigned integer.
Notes to Callers
Call this function for every new copy of an interface pointer that you make.
For example, if you are passing a copy of a pointer back from a function, you
must call IUnknown::AddRef
on that pointer. You must also call IUnknown::AddRef
on a pointer before passing it as an in-out parameter to a function; the
function will call IUnknown::Release
before copying the out-value on top of it.
- Software for developers
Software for Android Developers
- More information resources
Unix Manual Pages