Compartilhar via

IPortableDeviceContent::GetObjectIDsFromPersistentUniqueIDs

  • Artigo

banner art

Previous Next

IPortableDeviceContent::GetObjectIDsFromPersistentUniqueIDs

The GetObjectIDsFromPersistentUniqueIDs method retrieves the current object ID of one or more objects, given their persistent unique IDs (PUIDs).

Syntax

  HRESULT GetObjectIDsFromPersistentUniqueIDs(
  IPortableDevicePropVariantCollection*  pPersistentUniqueIDs,
  IPortableDevicePropVariantCollection**  ppObjectIDs
);

Parameters

pPersistentUniqueIDs

[in]  Pointer to an IPortableDevicePropVariantCollection interface that contains one or more persistent unique ID (PUID) string values (type VT_LPWSTR).

ppObjectIDs

[out]  Pointer to an IPortableDevicePropVariantCollection interface pointer that contains the retrieved object IDs, as type VT_LPWSTR. The retrieved IDs will be in the same order as the submitted PUIDs; if a value could not be found, it is indicated by an empty string. The caller must release this interface when it is done with it.

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.
E_POINTER At least one of the required arguments was a NULL pointer.

Remarks

Windows Portable Devices Object IDs are unique across the device, but may be different across sessions. (An Object ID can change when the application reconnects to the device.)

Certain applications, such as synchronization engines, require a way to identify the object across connection sessions. Every object has a WPD_OBJECT_PERSISTENT_UNIQUE_ID property, which indicates an identifier that is persistent across sessions. Applications can read and save this property in their initial session, by calling the Properties method.

Requirements

Header: Defined in PortableDeviceApi.h

Library: PortableDeviceGUIDs.lib

See Also

Previous Next