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Registration-free COM is a platform feature of great interest to enterprises with locked-down servers and applications isolated on shared infrastructures.
This article walks through a working example of the registration-free activation of a native COM component by native clients and, via COM interop, by a managed client.
In Registration-free COM, the terms assembly and manifest are borrowed for ideas that are similar in concept but not identical to their . Registration-free COM uses assembly to mean a set of one or more PE modules (i.e., either native or managed) deployed, named, and versioned as a unit.
Registration-free COM uses manifest to refer to text files with the .manifest extension containing XML, which either defines the identity of an assembly (assembly manifest), together with the binding and activation details of its classes, or defines the identity of an application (application manifest), together with one or more assembly identity references.
In Class View, right-click the ISide By Side Class node and choose Add | Add Method....
In the Add Method Wizard, enter Version as the method name, choose a parameter type of BSTR*, enter p Ver as the parameter name, select the retval check box, then click Add and then click Finish.
An assembly manifest file is named for the assembly, and an application manifest file is named for the application.
The term side-by-side (Sx S) assemblies refers to the configuration of different versions of the same COM component, via manifest files, in order that they can be loaded simultaneously by different threads without needing to be registered.
The component and the native client will be presented in both Visual C and Visual Basic 6.0; the managed client will be presented in both C# and Visual Basic . You can download the source code and samples and see them in action right away or you can follow along with the walkthrough and build them yourself step-by-step. NET Framework technology will be accustomed to the term assembly, which denotes a set of one or more modules deployed, named, and versioned as a unit, with one module containing a manifest that defines the set.In the absence of corresponding registry entries, it is an activation context that provides the binding and activation information the COM run time needs.No special code is required in the COM server or in the client unless you choose to obviate the use of files by building activation contexts yourself using the activation context API.Steve White Premier Support for Developers, Microsoft UK Leslie Muller Global IT Research & Development, Credit Suisse First Boston July 2005 Summary: The Microsoft Platform SDK does an excellent job of documenting the topics of isolated applications and side-by-side assemblies.However, not everyone equates this topic with that of registration-free activation of COM components.
At this stage we have frustrated the COM runtime from finding the information it needs in the registry but we have yet to make the information available by alternative means. Step 6 In the \deployed folder, create an application manifest file (a text file) for the application and call it manifest.