Enables containers and other objects to receive notifications of data changes, view changes, and compound-document changes occurring in objects of interest. Container applications, for example, require such notifications to keep cached presentations of their linked and embedded objects up-to-date. Calls to IAdviseSink methods are asynchronous, so the call is sent and then the next instruction is executed without waiting for the call's return.
For an advisory connection to exist, the object that is to receive notifications must implement IAdviseSink, and the objects in which it is interested must implement IOleObject::Advise and IDataObject::DAdvise. In-process objects and handlers may also implement IViewObject::SetAdvise. Objects implementing IOleObject must support all reasonable advisory methods. To simplify advisory notifications, OLE supplies implementations of the IDataAdviseHolder and IOleAdviseHolder, which keep track of advisory connections and send notifications to the proper sinks through pointers to their IAdviseSink interfaces. IViewObject (and its advisory methods) is implemented in the default handler.
As shown in the following table, an object that has implemented an advise sink registers its interest in receiving certain types of notifications by calling the appropriate method.
|Call This Method||To Register for These Notifications|
|IOleObject::Advise||When a document is saved, closed, or renamed.|
|IDataObject::DAdvise||When a document's data changes.|
|IViewObject::SetAdvise||When a document's presentation changes.|
When an event occurs that applies to a registered notification type, the object application calls the appropriate IAdviseSink method. For example, when an embedded object closes, it calls the IAdviseSink::OnClose method to notify its container. These notifications are asynchronous, occurring after the events that trigger them.
The IAdviseSink interface has these methods.
|IAdviseSink::OnClose||Called by the server to notify all registered advisory sinks that the object has changed from the running to the loaded state.|
|IAdviseSink::OnDataChange||Called by the server to notify a data object's currently registered advise sinks that data in the object has changed.|
|IAdviseSink::OnRename||Called by the server to notify all registered advisory sinks that the object has been renamed.|
|IAdviseSink::OnSave||Called by the server to notify all registered advisory sinks that the object has been saved.|
|IAdviseSink::OnViewChange||Notifies an object's registered advise sinks that its view has changed.|
|Minimum supported client||Windows 2000 Professional [desktop apps | UWP apps]|
|Minimum supported server||Windows 2000 Server [desktop apps | UWP apps]|