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VS.NET IDE also helps us generate a metadata assembly:Ĭlick on Project -> Add reference -> COM tab RCW is created on the fly whenever a component is created and it acts like managed types to COM specific data types. The metadata assembly so generated contains wrapper classes that can be used in any. Type library importer interrogates the COM DLL’s type library and translates the information therein into. Through “out” argument, we can specify the desired assembly name. Note: it internally resolves ADODB references in the COM.
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The above example generates a metadata assembly with the name “ InteropExampleRCW.dll” out of the COM component “ InteropExample.dll” using the following syntax at VS.NET command prompt:Ĭopy Code tlbimp InteropExample.dll /output:InteropExampleRCW.dll /verbose By default, the utility gives the wrapper assembly the same name as the COM DLL. Type Library Importer ( tlbimp.exe) is a command line syntax, which converts COM specific type definition in a COM type library into equivalent definitions for a. There are two ways to generate a managed metadata wrapper:
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that a client needs to know about the object. How is the Component Binding in interoperability?īinding refers to information on methods, properties, events etc. RCW manages the lifetime management of the COM component. When we make a method call, it goes onto RCW and not the object itself. It acts as managed proxy to the unmanaged COM component. NET application communicates with a COM component through a managed wrapper of the component called Runtime Callable Wrapper. The reference count is maintained through IUnknow::AddRef() and IUnknow::Release() methods, and interface discovery is handled through IUnknow::QueryInterface(). All components should implement the IUnknown interface. When this count drops down to zero, the component is unloaded. The component’s IUnknown interface helps to maintain a reference count of the number of clients using the component. It imposes a standard for the interfaces through which client code talks to component classes.
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What is COM?ĬOM stands for Component Object Model, which is a binary specification for software code re-use. NET component.īefore we move on to the core concepts, let’s have a small primer on COM. NET components believe that they are talking to just another. This is where Interoperability pitches in it’s a Runtime Callable Wrapper (RCW) that translates specific calls from managed clients into COM specific invocation requests on unmanaged COM components. These legacy components ought to be exploited by managed code in the. Most organizations, which have built their enterprise applications on COM objects for their middle tier services, cannot write off the investments on these solutions. NET components, hence they are not innately compatible. What is the need for Interoperability?ĬOM components have a different internal architecture from. In this article, we review the concepts and walk-through an example that demonstrates COM interoperability in.