IDirectWriterLock interface

The IDirectWriterLock interface enables a single writer to obtain exclusive write access to a root storage object opened in direct mode while allowing concurrent access by multiple readers. This single-writer, multiple-reader mode does not require the overhead of making a snapshot copy of the storage for the readers.

When to implement

Generally, you do not implement this interface unless you are defining a new storage scheme for your system. COM provides a compound file implementation of the IDirectWriterLock interface. For more information on the system-provided implementation, see IDirectWriterLock - Compound File Implementation.

When to use

Use this interface to obtain exclusive write access to a storage object in direct mode.

Call IDirectWriterLock::WaitForWriteAccess to obtain exclusive write access to the storage object. Call IDirectWriterLock::ReleaseWriteAccess to release exclusive write access.

IDirectWriterLock::HaveWriteAccess indicates whether the storage is currently locked.

Members

The IDirectWriterLock interface inherits from the IUnknown interface. IDirectWriterLock also has these types of members:

• Methods

Methods

The IDirectWriterLock interface has these methods.

Requirements

See also

IStorage

StgCreateDocfile