IAdviseSink - OLE Programmer's Reference

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IAdviseSink

The IAdviseSink interface enables containers and other interested 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.

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 one or more of the following: IOleObject::Advise, IDataObject::DAdvise, or IViewObject::SetAdvise. Objects implementing IOleObject must support all of these methods.

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

When to Implement
Objects, such as container applications, compound documents, and client sites implement IAdviseSink to receive notification of changes in data, presentation, name, or state of their linked and embedded objects. Implementors register for one or more types of notification, depending on their needs.

Notifications for an embedded object originate in the object application and flow to the container by way of the object handler. If the object is a linked object, the OLE link object intercepts the notifications from the object handler and notifies the container directly. All containers, the object handler, and the OLE link object register for OLE notifications. The typical container also registers for view notifications. Data notifications are usually sent to the OLE link object and object handler.

When to Use
Objects call IAdviseSink to notify other objects with whom they have an advisory connection of changes in data, view, name, or state.

Note Making synchronous calls within asynchronous methods is not valid, so you cannot make synchronous calls within any of the the IAdviseSink interface's methods. For example, an implementation of IAdviseSink::OnDataChange cannot contain a call to IDataObject::GetData.

Methods in Vtable Order

IUnknown Methods	Description
QueryInterface	Returns pointers to supported interfaces.
AddRef	Increments reference count.
Release	Decrements reference count.

IAdviseSink Methods	Description
OnDataChange	Advises that data has changed.
OnViewChange	Advises that view of object has changed.
OnRename	Advises that name of object has changed.
OnSave	Advises that object has been saved to disk.
OnClose	Advises that object has been closed.

See Also
IAdviseSink2, IDataAdviseHolder, IOleAdviseHolder, IOleObject::Advise, IOleObject::Unadvise, IOleObject::EnumAdvise

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