共用方式為

UlAddRef

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Applies to: Office 2010 | Outlook 2010 | Visual Studio

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

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.