Create and Use a C++ ActiveX component within a .NET environment

// CppActiveX.idl : type library source for ActiveX Control project.

// This file will be processed by the MIDL compiler tool to
// produce the type library (CppActiveX.tlb) that will become a resource in
// CppActiveX.ocx.

#include <olectl.h>
#include <idispids.h>

#define DISPID_TEST_METHOD (1025314)

[ uuid(4143F1BD-B6F2-4E6D-B45A-06399CE41154), version(1.0),
  helpfile("CppActiveX.hlp"),
  helpstring("CppActiveX ActiveX Control module"),
  control ]
library CppActiveXLib
{
	importlib(STDOLE_TLB);

	//  Primary dispatch interface for CCppActiveXCtrl

	[ uuid(CDE8EC88-7703-4021-9D19-3F23A4B7BFF0),
	  helpstring("Dispatch interface for CppActiveX Control")]
	dispinterface _DCppActiveX
	{
		properties:
		methods:

			[id(DISPID_ABOUTBOX)] void AboutBox();
            [id(DISPID_TEST_METHOD)] LONG TestMyMthod(LONG param1, LONG param2, BSTR param3);
	};

	//  Event dispatch interface for CCppActiveXCtrl

	[ uuid(DA8D1408-D0BE-48BF-961B-158C705C0AFD),
	  helpstring("Event interface for CppActiveX Control") ]
	dispinterface _DCppActiveXEvents
	{
		properties:
			//  Event interface has no properties

		methods:

            [id(1)] void EventHandlerTest(BSTR name, BSTR surname, LONG age);
    };

	//  Class information for CCppActiveXCtrl

	[ uuid(492FE2C4-EB74-4D41-8278-B4E290603118),
	  helpstring("CppActiveX Control"), control ]
	coclass CppActiveX
	{
		[default] dispinterface _DCppActiveX;
		[default, source] dispinterface _DCppActiveXEvents;
	};

};