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COM Interoperability

Posted Date: 10 Mar 2004	Resource Type: Articles	Category: Web Applications
Author: Kasiviswanath	Member Level: Gold
Rating:	Points: 7

COM (Component Object Model) is the binary specification for software code re-use. We can create components using VB, VC++ and .NET.

The .NET framework directly access only .NET component and it cannot access directly all other component, which is developed by VB or VC. The reason behind this is the "COM components have different internal architecture from .NET components", hence they are not innately compatible.

Creating the Runtime Callable Wrapper (RCW) is one way to access COM Component.

Two ways to create callable wrapper

1.Through the Visual Studio .NET IDE
2.Using Type Library Importer utility (tblimp.exe)

Execute the following code in the command line program.



tlbimp  COM.dll  /output:COMRCW.dll /verbose

Now the COM type library is converted into equivalent definitions for .NET wrapper assembly.

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