unit InterfaceUtilsUnit;

interface

type
  // 自前開放管理interface基底クラス(TInterfacedObjectの代替)
  // 参考：DelWiki - 資料/インターフェイス
  //  http://delwiki.info/?%BB%F1%CE%C1%2F%A5%A4%A5%F3%A5%BF%A1%BC%A5%D5%A5%A7%A5%A4%A5%B9
  TInterfacedBase = class(TObject, IUnknown)
    function QueryInterface(const IID: TGUID; out Obj): HRESULT; stdcall;
    function _AddRef: Integer; stdcall;
    function _Release: Integer; stdcall;
  end;

implementation

function TInterfacedBase._AddRef: Integer;
begin
  Result := -1;
end;

function TInterfacedBase._Release: Integer;
begin
  Result := -1;
end;

function TInterfacedBase.QueryInterface(const IID: TGUID; out Obj): HRESULT;
const
  E_NOINTERFACE = HResult($80004002);
begin
  if GetInterface(IID, Obj) then Result := 0 else Result := E_NOINTERFACE;
end;

end.