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IRootStorage
The IRootStorage 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
necessary.
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 with IID_IRootStorage to obtain a pointer to the IRootStorage interface.
Methods in Vtable Order
IRootStorage Method
| Description
| SwitchToFile
| Copy the file underlying this root storage object, then associate this storage
with the copied file.
|
See Also
IStorage, StgCreateDocfile
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