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To load and unload DLLs, you must determine a CLSID of an object in the DLL, the DLL's location, and keep track of its module handle after you load it The CLSID is a moving target if you don't set the DLL's compatibility level to the project or binary level There are several ways to determine the CLSID You can use a low-level type library browser (such as OleViewExe), the TLI (TypeLib Information) objects included with VB, or a utility called DumpClassDataExe included with the book DumpClassData generates a CLSID constant for each creatable class in a type library and a runtime license key for licensed objects in

CORBA Technology Projection methods, a pre_init and a post_init method, which are invoked before and after the initialization of the ORB respectively.

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class Client_ORBInitializer : public virtual PortableInterceptor::ORBInitializer { public: void pre_init (PortableInterceptor::ORBInitInfo_ptr) throw (CORBA::SystemException) {} void post_init (PortableInterceptor::ORBInitInfo_ptr info) throw(CORBA::SystemException) { PortableInterceptor::ClientRequestInterceptor_var interceptor (new Foo_ClientRequestInterceptor); info->add_client_request_interceptor (interceptor); } };

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a DLL or OCX Run DumpClassData by specifying a file on the command line or by selecting one in a dialog In either case, the utility generates clipboard data that looks something like this 'Target control Private Const strCLSID_Target As String = _ "{C33A1760-A296-IID3-BBF5-D41203C10000}" Private Const RTLic_Target As String = "mkjmmmrlhmknmo" Once you have obtained the CLSID, you can use this calling code to load and unload the DLL This code loads from a single DLL, and doesn't cache the class factory You can modify the code to track multiple DLLs or cache the class factory Const strDllObjectCLSID As String = _ "{C33A1760-A296-IID3-BBF5-D41203C10000}" Dim CLSID_DllObject As CLSID Dim m_hModMyDll As Long Sub CreateMyDllObject(RelPath As String) As MyDllObject Dim pCF As IClassFactory If m_hModMyDll = 0 Then 'Load or reload the DLL CLSID_DllObject = GUIDFromString(strDllObjectCLSID) Set pCF = GetDLLClassObject(AppPath & "\" & _ RelPath, CLSID_DllObject, m_hModMyDll) Else Set pCF = GetDllClassObject(vbNullString, _ CLSID_DllObject, m_hModMyDll) End If 'Create the instance IID_IUnknown is declared in 'COMDllLoaderBas Set CreateMyDllObject = _ pCFCreateInstance(Nothing, IID_IUnknown) End Sub Sub UnloadDll() TestUnloadDll m_hModMyDll End Sub

is no different. Making an educated decision not to implement a technology is one thing. Ignoring the threat altogether because you think you know better is another. One real good example of a piece of BlackBerry malware is BBProxy. By far, this is the most well-known BlackBerry vulnerability. If BBProxy were running on one of your BlackBerrys, would you want to know about it and remove it This simple example can put to rest the idea that BlackBerrys are not vulnerable to malware. Remember malware doesn t have to be sent via an email attachment to get onto a device. Someone can gain physical access to a BlackBerry and load the program. The manner in which it gets there can differ; the fact that it s on there needs to be addressed.

The ORB initializer is registered with the ORB library before a actual ORB instance is created by CORBA::ORB_init.

You should control the DLL loading only if the application's single-threaded or if the DLL supports apartment threading Do not use the "load-it-yourself" code to violate COM's apartment rules If the target DLL is single-threaded, COM creates all objects on a single thread and provides a proxy object instead of a directly created object Fortunately, it is trivially easy to change a project property and make VB-created DLLs apartment threaded

PortableInterceptor::ORBInitializer_var initializer (new Client_ORBInitializer); PortableInterceptor::register_orb_initializer (initializer.in()); CORBA::ORB_var orb = CORBA::ORB_init (argc, argv, "");

N OT E The next chapter, Hacking the Supporting BlackBerry Infrastructure, provides a detailed explanation of BBProxy and how it affects the enterprise.

Activation strategies The simplest and most straightforward usage of the POA is that for STATIC INSTANCES: activation of remote objects at server application start-up time. CORBA servant managers have already been mentioned above in the context of the POA. They are used when the trivial activation of servants at start-up time, such as the case of STATIC INSTANCES, is not sufficient. This happens typically in servers that have to deal with a huge number of remote object instances. Servant managers are a separate concept of interception when compared with portable interceptors: they are specialized for servant activation and deactivation, and are historically a much older concept than portable interceptors.

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