interface contains a single method that switches a storage object to a
different underlying file and saves the storage object to that file. The save
operation occurs even with low memory conditions and uncommitted changes to the
storage object. A subsequent call to IStorage::Commit
is guaranteed to not consume any additional memory.
When to Implement
Storage objects that are based on a file should implement IRootStorage
in addition to the IStorage
interface. For storage objects that are not file-based, this interface is not
OLE provides an implementation of a storage object, including the IRootStorage
interface, as part of its compound file implementation.
When to Use
The primary use for the IRootStorage
interface is to save a storage object to a file during low memory conditions.
Typically, the container application calls the IRootStorage
interface to switch to a new file.
You can call IStorage::QueryInterface
to obtain a pointer to the IRootStorage
Methods in Vtable Order
||Copy the file underlying this root storage object, then associate this storage
with the copied file.
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