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IPortableDeviceValues::GetIUnknownValue

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IPortableDeviceValues::GetIUnknownValue

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

Syntax

  HRESULT GetIUnknownValue(
  REFPROPERTYKEY  key,
  IUnknown**  ppValue
);

Parameters

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.

Return Values

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.

Requirements

Header: Defined in PortableDeviceTypes.h

Library: PortableDeviceGUIDs.lib

See Also

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