interface provides methods for an object to load and save itself in a disk
file, instead of saving itself to a storage object. Because the information
needed to open a file varies greatly from one application to another, the object
must be responsible for opening its disk file.
When to Implement
interface is implemented by any object or container application that can be
linked through a file moniker, including the following:
- Any object that supports links to its files or to pseudo-objects within its files
- A container application that supports links to component objects within its
Typically, you implement the IPersistFile
interface as part of an aggregate object that includes other interfaces that
are appropriate for the type of moniker binding that is supported.
For example, in either of the cases mentioned above, the moniker for the
linked object can be a composite moniker. In the first case, a composite moniker
identifies the pseudo-object contained within the file. In the second case, a
composite moniker identifies the embedded object contained within the compound
file. In either case of composite monikers, you must implement the IPersistFile
interface as part of same object that also implements the IOleItemContainer
interface. Then, when the application for the linked object is run, OLE
queries for the IOleItemContainer
interface to locate the embedded object or the pseudo-object contained in the
As another example, if the moniker is a simple file moniker (i.e., the link is
to the entire file), OLE queries for the interface that the initiator of the
bind operation requested. Typically, this is one of the compound document
interfaces, such as IOleObject
, or IPersistStorage
When to Use
You call methods in the IPersistFile
interface to load or save a linked component object in a specified file.
When the application for the linked object is run, OLE calls the IPersistFile::Load
method. Once the file is loaded, OLE calls IPersistFile::QueryInterface
to get another interface pointer to the loaded object. The IPersistFile
interface is typically part of an aggregate object that offers other
Note that OLE calls only the IPersistFile::Load
method. It does not call any of the other IPersistFile
methods. Typically, applications do not call these methods either. The IPersistFile::Load
method enables OLE to load a file on behalf of a container application when
the container needs to run the application for the linked object. The other IPersistFile
methods support saving a component to a file, but container applications do
not tell a linked object to save itself. It is entirely up to the end user and
the application for the linked object to decide when the component should be
saved. This differs from the situation for an embedded component, in which the
container application uses the IPersistStorage
interface to provide the storage and to tell the component when to save
Methods in Vtable Order
||Checks an object for changes since it was last saved to its current file.
||Opens the specified file and initializes an object from the file contents.
||Saves the object into the specified file.
||Notifies the object that it can revert from NoScribble mode to Normal mode.
||Gets the current name of the file associated with the component.
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