IPersistStream::IsDirty
A version of this page is also available for
4/8/2010
This method checks the object for changes since it was last saved.
Syntax
HRESULT IsDirty(void);
Parameters
None.
Return Value
If the object has changed since it was last saved, the return value is S_OK.
If the object has not changed since the last save, the return value is S_FALSE.
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 IPersistStream::Save method.
To determine whether the platform supports this interface, see Determining Supported COM APIs.
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.
Requirements
| Header | objidl.h, objidl.idl |
| Library | ole32.lib, uuid.lib |
| Windows Embedded CE | Windows CE 3.0 and later |
| Windows Mobile | Windows Mobile Version 5.0 and later |