Creates a connection between an advise sink and a data object for receiving notifications.


IDataObject * pDataObject,
//Specifies the data object for which notifications are requested
FORMATETC * pFormatetc,
//Description of data that is of interest to the advise sink
DWORD advf,
//Flags that specify how the notification takes place
IAdviseSink * pAdvSink,
//The advise sink requesting notification
DWORD * pdwConnection
//Identifies the connection for future calls to the Unadvise method



[in]Points to the data object for which notifications are requested. If data in this object changes, a notification is sent to the advise sinks that have requested notification.


[in]Points to the specified format, medium, and target device that is of interest to the advise sink requesting notification. For example, one sink may want to know only when the bitmap representation of the data in the the data object changes. Another sink may be interested in only the metafile format of the same object. Each advise sink is notified when the data of interest changes. This data is passed back to the advise sink when notification occurs.


[in]Contains a group of flags for controlling the advisory connection. Valid values are from the enumeration ADVF. However, only some of the possible ADVF values are relevant for this method. The following table briefly describes the relevant values; a more detailed description can be found in the description of the ADVF enumeration.

ADVF Value
Asks that no data be sent along with the notification.
Causes the advisory connection to be destroyed after the first notification is sent. An implicit call to IDataAdviseHolder::Unadvise is made on behalf of the caller to remove the connection.
Causes an initial notification to be sent regardless of whether or not data has changed from its current state.
When specified with ADVF_NODATA, this flag causes a last notification with the data included to be sent before the data object is destroyed. When ADVF_NODATA is not specified, this flag has no effect.


[in]Points to the advisory sink that receives the change notification.


[in]Points to the location of a returned token that identifies this connection and can later be used to delete the advisory connection. It deletes the connection by passing it to IDataAdviseHolder::Unadvise. If this value is zero, the connection was not established.

Return Values


The advisory connection was created.


One or more arguments are invalid.


Through the connection established through this method, the advisory sink can receive future notifications in a call to IAdviseSink::OnDataChange.

An object issues a call to IDataObject::DAdvise to request notification on changes to the format, medium, or target device of interest. This data is specified in the pFormatetc parameter. The DAdvise method in turn calls IDataAdviseHolder::Advise and delegates the task of setting up and tracking a connection to the advise holder. When the format, medium, or target device in question changes, the data object calls IDataAdviseHolder::SendOnDataChange to actually send the necessary notifications.

The established connection can be deleted by passing the value in pdwConnection to IDataAdviseHolder::Unadvise.

See also

ADVF, CreateDataAdviseHolder, FORMATETC, IDataAdviseHolder::Unadvise, IDataObject::DAdvise

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