Yes. COM components are accessed from the .NET runtime via a RuntimeCallable Wrapper (RCW). This wrapper turns the COM interfaces exposed by
the COM component into .NET-compatible interfaces. For oleautomation
interfaces, the RCW can be generated automatically from a type library. For
non-oleautomation interfaces, it may be necessary to develop a custom RCW
which manually maps the types exposed by the COM interface to .NETcompatible
types.
Here’s a simple example for those familiar with ATL. First, create an ATL
component which implements the following IDL:

import “oaidl.idl”;
import “ocidl.idl”;
[
object,
uuid(EA013F93-487A-4403-86EC-FD9FEE5E6206),
helpstring(“ICppName Interface”),
pointer_default(unique),
oleautomation
]
interface ICppName : IUnknown
{
[helpstring(“method SetName”)] HRESULT SetName([in] BSTR name);
[helpstring(“method GetName”)] HRESULT GetName([out,retval] BSTR *pName );
};
[
uuid(F5E4C61D-D93A-4295-A4B4-2453D4A4484D),
version(1.0),
helpstring(“cppcomserver 1.0 Type Library”)
]
library CPPCOMSERVERLib
{
importlib(“stdole32.tlb”);
importlib(“stdole2.tlb”);
[
uuid(600CE6D9-5ED7-4B4D-BB49-E8D5D5096F70),
helpstring(“CppName Class”)
]
coclass CppName
{
[default] interface ICppName;
};
};
When you’ve built the component, you should get a typelibrary. Run the
TLBIMP utility on the typelibary, like this:
tlbimp cppcomserver.tlb
If successful, you will get a message like this:
Typelib imported successfully to CPPCOMSERVERLib.dll
You now need a .NET client – let’s use C#. Create a .cs file containing the
following code:
Satish Marwat Dot Net Web Resources satishcm@gmail.com 24 Page
using System;
using CPPCOMSERVERLib;
public class MainApp
{
static public void Main()
{
CppName cppname = new CppName();
cppname.SetName( “bob” );
Console.WriteLine( “Name is ” + cppname.GetName() );
}
}
Compile the C# code like this:
csc /r:cppcomserverlib.dll csharpcomclient.cs
Note that the compiler is being told to reference the DLL we previously
generated from the typelibrary using TLBIMP. You should now be able to run
csharpcomclient.exe, and get the following output on the console: