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before you delete its memory The CopyMemory call transfers ownership to the heap allocation, so you take ownership of the object's scope This makes you responsible for freeing contained pointer references before the structure goes out of scope at the CoTaskMemFree call There are two ways to do this The first is to use brute force in-line code This code assigns all strings to vbNullString (not ""), sets all objects to Nothing, and erases all arrays This is a hassle for a complex object and a potential source of memory leak bugs The alternative is to write a helper sub that makes VB clean the structure for you This procedure is used in place of the CoTaskMemFree call in the Release function Private Sub DeleteThis(This As AnyStruct) Dim tmp As AnyStruct Dim pThis As Long pThis = VarPtr(This) CopyMemory ByVal VarPtr(tmp), ByVal pThis, LenB(This) CoTaskMemFree pThis End Sub DeleteThis uses the temporary structure variable to do the work you prevented VB from doing way back in the creation function DeleteThis transfers ownership of the This structure back to a VB local variable, making VB free the structure members when the procedure exits Note that a ZeroMemory call after the CopyMemory is redundant because the This memory is about to be freed Of course, if you like to clean your garbage before throwing it out, you're welcome to make the ZeroMemory call Stack-Allocated Lightweight Objects The memory-allocation and data-transfer work forms the majority of the code in the heap-based LightEmpty example This code is greatly simplified when the lightweight object gets stack or embedded memory on which to build the object The nonheap lightweight case actually splits into two cases In the first case, the COM object needs to run code when the object is destroyed In the second case, no termination code is required In either case, the memory on which the COM object is built is cleaned and freed automatically when the structure it is built on goes out of scope Let's look at LightEmpty code for these two cases.

CORBA::PolicyList policies (1); policies.length (1); policies[0] = rtorb->create_priority_model_policy ( RTCORBA::CLIENT_PROPAGATED, DEFAULT_PRIORITY /* For non-RT ORBs */); PortableServer::POA_var my_poa = root_poa->create_POA ("My_POA", PortableServer::POAManager::_nil (), policies); // Activate a servant my_poa->activate_object (my_servant);

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When configuring your options, think of it this way If you simply want to restrict all third-party applications from making connections, you can select Connections and choose the Deny option But consider using Custom When using custom, you can then go into Options Advanced Applications and set specific settings for each application This would allow you to not explicitly deny every application from getting connectivity; it could simply let you know that applications are trying to get connectivity and you can decide whether to allow that connection I will cover the Options Advanced Applications settings later in this section When configuring the other options, I recommend erring on the side of security and denying all of the connections for third-party applications, especially if you didn t personally load any third-party applications.

Note that the CLIENT_PROPAGATED policy is set on the server and exported to the client as part of the ABSOLUTE OBJECT REFERENCE. Knowing how to configure for end-to-end priorities, we also need to know how to change CORBA priorities at the client. How can RTCORBA client applications change the priority of operations The solution is to use the RTCurrent LOCAL OBJECT to change the priority of the current thread explicitly, which is accessed in a similar way to the Current LOCAL OBJECT mentioned on page 301 and page 322. As the Current LOCAL OBJECT represents the current thread logically in regular CORBA, the RTCurrent LOCAL OBJECT represents the current thread logically in RT-CORBA. An RTCurrent can also be used to query the priority. The values are expressed in the CORBA priority range and the behavior of RTCurrent is thread-specific.

Private Type LightEmptyVTable VTable(2) As Long End Type Private m_VTable As LightEmptyVTable Private m_pVTable As Long Public Type LightEmpty pVTable As Long cRefs As Long End Type Public Function InitializeLightEmpty(Struct As LightEmpty) _ As IUnknown 'Make sure we have a vtable If m_pVTable = 0 Then With m_VTable VTable(0) = FuncAddr(AddressOf QueryInterface) VTable(l) = FuncAddr(AddressOf AddRef) VTable(2) = FuncAddr(AddressOf Release) m_pVTable = VarPtr(VTable(0)) End With End If 'Initialize the structure With Struct pVTable = m_pVTable cRefs = 1 End With 'Assign the pointer to the structure to 'the function name VBoostAssign InitializeLightEmpty, VarPtr(Struct) End Function Private Function QueryInterface(This As LightEmpty, _ riid As Long, pvObj As Long) As Long 'Just fail (I'll discuss QI later in the chapter) pvObj = 0 QueryInterface = E_NOINTERFACE End Function

CORBA::Object_var obj = orb->resolve_initial_references ("RTCurrent"); RTCORBA::RTCurrent_var rt_current = RTCORBA::RTCurrent::_narrow (obj); rt_current->the_priority (10/*VERY_HIGH_PRIORITY*/); // Invoke the request at <VERY_HIGH_PRIORITY> priority foo->bar ();

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