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IDataAdviseHolder
The IDataAdviseHolder interface creates and manages connections between an advise sink and a data
object so that the advise sink can receive notification of changes in the data
object. The IDataAdviseHolder interface also sends the notifications to the advise sinks it currently knows
about when changes occur.
The object or container wishing to receive notification of changes in your
data object creates an advise sink object with the IAdviseSink interface. The object or container application then calls your IDataObject::DAdvise method.
Typically, in your IDataObject implementation, you delegate handling of the advise sinks to the OLE-provided IDataAdviseHolder interface. This interface has methods to keep track of any IDataObject::DAdvise calls that your data object has received and to send notification back to the
advise sinks as necessary when data has changed.
When to implement
Typically, you use the OLE-provided implementation of IDataAdviseHolder to simplify your implementation of the DAdvise, DUnadvise, and EnumDAdvise methods in the IDataObject interface.
When to use
Your implementation of IDataObject can call the methods in IDataAdviseHolder. The first time you receive a call to IDataObject::DAdvise, you call the API function CreateDataAdviseHolder to create an instance of the OLE-provided implementation of IDataAdviseHolder. Then, you delegate your IDataObject implementations of the DAdvise, DUnadvise, and EnumDAdvise methods to the corresponding methods in the OLE-provided IDataAdviseHolder.
When the data of interest to an advise sink actually changes, you call IDataAdviseHolder::SendOnDataChange from your data object to carry out the necessary notifications.
Methods in VTable Order
IDataAdviseHolder Methods
| Description
| Advise
| Creates a connection between an advise sink and a data object so the advise
sink can receive notification of change in the data object.
| Unadvise
| Destroys a notification connection previously set up with the Advise method.
| EnumAdvise
| Returns an object that can be used to enumerate the current advisory
connections.
| SendOnDataChange
| Sends a change notification back to each advise sink that is currently being
managed.
|
See Also
IDataObject, IAdviseSink
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