Function

Summary

Increments the reference count of a COM interface pointer.

Package

com

Signature

add-ref interface-ptr => ref-count

Arguments

interface-ptr

A COM interface pointer.

Values

ref-count

The new reference count.

Description

Each COM interface pointer has a reference count which is used by the server to control its lifetime. The function add-ref should be called whenever an extra reference to the interface pointer is being made. The function invokes the COM method IUnknown::AddRef so the form (add-ref ptr) is equivalent to using call-com-interface as follows:

(call-com-interface (ptr i-unknown add-ref))

Example

(add-ref p-foo)

See also

release
interface-ref
query-interface
call-com-interface