> a)should I create the ITest interface using CoCreateInstance or can I use
> CComPtr?
> b)should I do an AddRef on the newly created ITest interface * when
passing
> the interface?

> interface ITestCreator : IDispatch
>  {
>   [id(1), helpstring("method callme")]HRESULT callme([out,retval] ITest **
> testObject);
>  };
>  interface ITest : IDispatch
>  {
>   [propget, id(1), helpstring("property testid")] HRESULT testid([out,
> retval] long *pVal);
>   [propput, id(1), helpstring("property testid")] HRESULT testid([in] long
> newVal);
>   };

> say in the implementation of
> STDMETHODIMP CTestCreator::callme(ITest ** test)
> {

> > Hi,
> > I have the following defenitions of the two interfaces to be used by a
VB
> > client ,I have two questions,

> > a)should I create the ITest interface using CoCreateInstance or can I
use
> > CComPtr?
> > b)should I do an AddRef on the newly created ITest interface * when
> passing
> > the interface?

> > interface ITestCreator : IDispatch
> >  {
> >   [id(1), helpstring("method callme")]HRESULT callme([out,retval] ITest
**
> > testObject);
> >  };
> >  interface ITest : IDispatch
> >  {
> >   [propget, id(1), helpstring("property testid")] HRESULT testid([out,
> > retval] long *pVal);
> >   [propput, id(1), helpstring("property testid")] HRESULT testid([in]
long
> > newVal);
> >   };

> > say in the implementation of
> > STDMETHODIMP CTestCreator::callme(ITest ** test)
> > {
>          // You can use raw pointer ...
>         ::CoCreateInstance(CLSID_Test, NULL, CLSCTX_ALL, IID_ITest, (void
> **)test);
>         // and call interface methods if you'd like ...
>         // i.e. test->someInterfaceMethod(...)

>         // ... or CComPtr<> ...
>         CComPtr<ITest> ptrTest;
>         ptrTest.CoCreateInstance(CLSID_Test);
>         // and call interface methods if you'd like ...
>         // i.e. test->someInterfaceMethod(...);
>         *test = ptrTest.Detach();

>         // ... or CComObject<> ...
>         CComObject<CTest>* pTest = NULL;
>         CComObject<CTest>::CreateInstance(&pTest);
>         pTest->AddRef();
>         // ... and call methods or set members of a class which implements
> ITest interface
>         // i.e. pTest->m_someIntMember = 5, pTest->someMethod(...)
>         pTest->QueryIterface(IID_ITest, (void **)test);
>         pTest->Release();

>         // I prefer he last one method - of course if
>         // ITest and ITestCreated are located in the same library -
>         // if not use first or second approach
> > }