IPersistStream::IsDirty

Checks the object for changes since it was last saved.

HRESULT IsDirty(void);
Return Values
S_OK

The object has changed since it was last saved.

S_FALSE

The object has not changed since the last save.

Comments
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 method.

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.