IPortableDeviceValues::GetIUnknownValue method

The GetIUnknownValue method retrieves an IUnknown interface value (type VT_UNKNOWN) specified by a key.

Syntax

HRESULT GetIUnknownValue(
  [in]  REFPROPERTYKEY key,
  [out] IUnknown       **ppValue
);

key [in]: A REFPROPERTYKEY key that specifies the item to retrieve.
ppValue [out]: Address of a variable that receives a pointer to the retrieved IUnknown interface. The caller is responsible for calling Release on the retrieved interface.

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.
DISP_E_TYPEMISMATCH	The property specified by key is not an IUnknown interface.
HRESULT_FROM_WIN32(ERROR_NOT_FOUND)	The property specified by key is not in the collection.

Requirement	Value
Header	PortableDeviceTypes.h
Library	PortableDeviceGUIDs.lib