# IPersistMemory::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.

Remarks

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 IPersistMemory::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.

See Also

IPersistMemory::Save