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get an IPersistStreamInit interface, it tries to get an IPersistPropertyBag interface IPersistPropertyBag also has an InitNew method ObjCreateOlb includes interface definitions that allow you to initialize objects by using these standard interfaces If you know the object you're creating does nothing in InitNew, you can skip the initialization code The following snippet uses the CreateClassFactory function I showed you earlier, but this time it also attempts to initialize the object 'Calling Code, even closer to CreateObject Dim MyObj As MyObject Dim MyObjCF As IClassFactory Dim IID_IUnknown As IID Dim pInit As IPersistStreamInit IID_IUnknown = IIDFromString(strIID_IUnknown) Set MyObjCF = CreateClassFactory(CLSIDFromProgID( _ "MyProjMyObj")) Set MyObj = MyObjCFCreateInstance(Nothing, IID_IUnknown) On Error Resume Next Set pInit = MyObj On Error GoTo 0 If Not pInit Is Nothing Then pInitInitNew
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Although you can duplicate all the steps that CoGetClassObject goes through to retrieve a class factory from a DLL, there is no inherent reason for you to rely on a registry entry to locate and load a DLL There are two big advantages to loading a COM object based on the path of the executable rather than on a path in the system registry The first advantage is that you can use the DLL in the same thread without registering it with COM The distribution and versioning advantages of this approach are numerous You can distribute multiple versions of the same DLL and isolate each version to completely eliminate any chance of compromising a previously installed application that uses the same DLL You must register the type library if you plan to pass an object between threads or processes, but even in this case you don't need to use the registry to locate and load the DLL
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The second advantage is that you can load multiple equivalent DLLs and use the same code to control their objects You can easily give multiple DLLs the same set of CLSIDs and IIDs by using the same binary-compatible file for multiple DLL projects This allows you to define a standard set of interfaces for adding capabilities to the main application, and then add pieces to the application dynamically by adding or removing DLLs from a directory or data file in the application's directory By loading the DLLs directly, you can also unload and upgrade them directly, allowing you to update pieces of the application without shutting it down Just be sure to use nonconflicting base addresses for each DLL The MSDN documentation says that CoLoadLibrary function uses the bAutoFree parameter to specify that the DLL is unloaded automatically if it is no longer in use when the CoFreeUnusedLibraries API is called Don't believe the documentation (except for the part that says you shouldn't call CoLoadLibrary directly) If you step through the API call with system symbols in place, you'll see that the bAutoFree parameter is ignored CoLoadLibrary is nothing more than a thin wrapper on LoadLibraryEx CoGetClassObject maintains the list of loaded libraries for CoFreeUnusedLibraries without using CoLoadLibrary Since direct loading doesn't use CoGetClassObject, this means that you can't use CoFreeUnusedLibraries to implicitly free the DLL The one special thing that CoLoadLibrary does is to call LoadLibraryEx with the LOAD_WITH_ALTERED_SEARCH_PATH flag When you specify a full path for the DLL, this flag tells Windows to search for dependent DLLs starting with the DLLs directory not in the directory of the application that is using it Using the DLL search path can be especially important if you call LoadLibraryEx from another DLL rather than from an EXE
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You can use LoadLibrary[Ex] indirectly to specify a DLL path for Declare calls, This can be especially useful in DLL projects, which attempt to resolve the library names relative to the path of the EXE that loaded them A Declare statement in a DLL doesn't even pick up another DLL in the same directory unless the directory is also part of the application path If you are not sure that a DLL will be located on the path but you know the path relative to the EXE or DLL,
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