MIDL - Microsoft Interface Definition Language

build.bat

echo "compiling MIDL..."                  ::   Make sure tools are in PATH (eg Developer Command Prompt for VS 2017)
midl myfilectl.idl /tlb myfilectl.tlb
echo "done."

myfilectl.idl

import "oaidl.idl","unknwn.idl";
[
uuid(a03d1422-b1ec-11d0-8c3a-00c04fc31d2f),
helpstring("IFace3 interface"),
pointer_default(unique),
dual,
oleautomation
] 
interface IFace3 : IUnknown
{
   HRESULT MethodC([in] long Max,
                [in, max_is(Max)] BSTR [ ],
                [out] long * pSize,
                [out, size_is( , *pSize)] BSTR  ** ppBKFST);
}; //end IFace3 def

myfilectl.tlb

library MyTypeLibraryFileLib
{
 [
  uuid(B3F6C9C4-26AE-451B-9788-75F6C648DBF4),
  helpstring("LogManager Class")
 ]
 coclass LogManager
 {
  [default] interface ILogManager;
 }; 
}