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class and can't shut down properly To break the circular reference without holding an unsafe reference on the aggregated object itself, the aggregate releases a reference on the controlling IUnknown and puts the reference count back during teardown before releasing the aggregated object (See "Safe Weak Referencing of Secondary Interfaces" in 10 for more information on balanced weak references) It is very dangerous to combine adNoDelegator with adWeakRefBalanced because the returned reference holds no reference count on the controlling IUnknown and can easily cause a crash adWeakRefRaw tells the aggregator to simply hold the reference as a raw
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weak reference The controlling IUnknown should hold a reference on weakly referenced objects The same comments regarding adNoDelegator apply to adWeakRefRaw as to adWeakRefBalanced AggregateUnknown The AggregateUnknown function builds an aggregate on top of an existing IUnknown by hooking the vtable of the controlling IUnknown The hook remains in place until the UnknownHook object returned by AggregateUnknown is set to Nothing Generally, the UnknownHook object itself is owned by the controlling IUnknown, which can teardown correctly even if the hook is still active This enables you to aggregate with code in Class_Initialize only Here are the parameters for AggregateUnknown pUnk (ByVal stdoleIUnknown) is the object that should act as the control-
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ling IUnknown Do not use SafeUnknown when passing to this parameter; the IUnknown QI resulting from the pass to IUnknown is expected and required You will generally pass Me to this parameter pData (AggregateData array) fies the layout of the aggregate pIIDs (VBGUID array) is the list of IIDs pointed to by the FirstIID and LastIID is the array of AggregateData items that speci-
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fields in pData This array may be empty, but you must provide it ppOwner (UnknownHook, out parameter) takes a member variable declared
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as long as UnknownHook remains in scope You can remove the hook at any time by setting the variable to Nothing 'Aggregate a Form with a collection object, then retrieve 'the collection from the form and display an item Private m_Hook As UnknownHook Private Sub Commandl_Click() Dim Coll As Collection Set Coll = Me MsgBox Coll(l) If TypeOf Coll Is Form Then MsgBox "(with a new identity)" End If End Sub Private Sub Form_Initialize() Dim Coll As Collection Dim pIIDs() As VBGUID Dim AggData(0) As AggregateData Set Coll = New Collection CollAdd "I'm alive!" With AggData(0) Set pObject = Coll Flags = adIgnoreIIDs End With VBoostAggregateUnknown Me, AggData, pIIDs, m_Hook End Sub
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CreateAggregate CreateAggregate aggregates using the same data as AggregateUnknown, but it creates a new controlling IUnknown object instead of hooking an existing one CreateAggregate returns a stdoleIUnknown reference, which you can then assign to a more specific object type pData pIIDs same as AggregateUnknown same as AggregateUnknown is an optional parameter that lets you track
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pOwner (Optional, ByVal Long)
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whether your aggregate object is still alive Specifying pOwner lets you return an
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existing aggregate rather than creating a new one on every request If you want such a capability, pass the VarPtr of a member variable of one of the objects you specify in a pObject field in the pData array When the aggregate object is destroyed, this memory address is zeroed Since the aggregate holds a reference on the pObject objects you send with pData, this memory address is guaranteed to be valid during the lifetime of the aggregate 'CreateExternal is a specific version of the function shown in 'in "Hierarchical Object Models" section of 6 In 'this scenario, a Child object has a weak reference on its 'parent object When the Child object is passed to an 'external client, it needs to protect its parent This is 'easily done with CreateAggregate by establishing the child 'as a blindly aggregated object and the parent as a reference 'that isn't queried 'Child is the main object, ParentPtr is the ObjPtr of its 'parent, and ExternalPtr is a member variable of Child This 'function is in ExternalChildBas on the CD Function CreateExternal(ByVal Child As IUnknown, _ ByVal ParentPtr As Long, ExternalPtr As Long) As IUnknown Dim AggData(l) As AggregateData Dim IIDs () As VBGUID If ExternalPtr Then VBoostAssignAddRef CreateExternal, ExternalPtr Else 'Defer all QueryInterface calls to the child With AggData(0) Set pObject = Child Flags = adIgnoreIIDs End With 'Let the aggregator hold the parent reference for us, 'but don't forward QueryInterface calls to it With AggData(l) VBoostAssignAddRef pObject, ParentPtr Flags = adDontQuery End With Set CreateExternal = VBoostCreateAggregate( _ AggData, IIDs, VarPtr(ExternalPtr))
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