COM in plain C, Part 2

// The IDL file for IExample2.DLL
//
// {4370990C-5481-4901-BF01-CF0F298D923C} = Type library's GUID
// {30D789C0-553A-4f36-A13B-807A3003FDC0} = IExample2 object's GUID
// {112BD761-DE08-4e94-95F7-473E3CEFE26A} = IExample2 VTable's GUID

[uuid(4370990C-5481-4901-BF01-CF0F298D923C), version(1.0), helpstring("IExample2 COM server")]
library IExample2
{
	importlib("STDOLE2.TLB");

	[uuid(112BD761-DE08-4e94-95F7-473E3CEFE26A), dual, oleautomation, hidden, nonextensible]
	interface IExample2VTbl : IDispatch
	{
		[helpstring("Sets the test string.")]
		[id(1), propput] HRESULT Buffer([in] BSTR);
		[helpstring("Gets the test string.")]
		[id(1), propget] HRESULT Buffer([out, retval] BSTR *);
	};

	[uuid(30D789C0-553A-4f36-A13B-807A3003FDC0), helpstring("IExample2 object."), appobject]
	coclass IExample2
	{
		[default] interface IExample2VTbl;
	}
}