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UlAddRef

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Applies to: Outlook 2013 | Outlook 2016

Provides an alternative way to invoke the OLE method IUnknown::AddRef.

Property Value
Header file:
Mapidefs.h
Implemented by:
MAPI
Called by:
Client applications and service providers 
ULONG UlAddRef(
  LPVOID punk
);

Parameters

punk

[in] Pointer to an interface derived from the IUnknown interface, in other words any MAPI interface.

Return value

S_OK

The call succeeded and has returned the expected value or values.

MAPI_E_CALL_FAILED

An error of unexpected or unknown origin prevented the operation from completing.

Remarks

UlAddRef returns the value returned by the IUnknown::AddRef method, which is the new value of the reference count for the interface. The value is nonzero.

For more information about IUnknown::AddRef, see Implementing the IUnknown Interface.