Checks the object for changes since it was last saved.
The object has changed since it was last saved.
The object has not changed since the last save.
This method checks whether an object has changed since it was last saved so
you can avoid losing information in objects that have not yet been saved. The
dirty flag for an object is conditionally cleared in the IPersistStream::Save
Notes to Callers
You should treat any error return codes as an indication that the object has
changed. In other words, unless this method explicitly returns S_FALSE, you must
assume that the object needs to be saved.
Note that the OLE-provided implementations of the IPersistStream::IsDirty
method in the OLE-provided moniker interfaces always return S_FALSE because
their internal state never changes.
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