Small ATL Tricks: Part One

// ErrorDispatch.idl : IDL source for ErrorDispatch.dll
//

// This file will be processed by the MIDL tool to
// produce the type library (ErrorDispatch.tlb) and marshalling code.

import "oaidl.idl";
import "ocidl.idl";
	[
		object,
		uuid(82BE5480-9585-4CCD-9798-F27190766D45),
		dual,
		helpstring("IFoo Interface"),
		pointer_default(unique)
	]
	interface IFoo : IDispatch
	{
		[id(1), helpstring("Generates an error displaying the string provided")] HRESULT GenerateError(BSTR Message);
	};

[
	uuid(88DD580C-FDE6-4F43-8B81-72E95C061F37),
	version(1.0),
	helpstring("ErrorDispatch Demonstration Library")
]
library ERRORDISPATCHLib
{
	importlib("stdole32.tlb");
	importlib("stdole2.tlb");

	[
		uuid(77D24643-1922-4C42-A7C3-FBBDDA71559C),
		helpstring("Foo Class")
	]
	coclass Foo
	{
		[default] interface IFoo;
	};
};