Using VB COM object in VC++

[Jim Owen]

Hi,

I have a COM object that I'm trying to use from within a VC++ dll. I'm
pretty sure that the COM object was written in VB although we didn't write
it. I registered the dll and have been able to successfully use it from
within a VB.NET program.

I need to be able to access it from within a VC++ dll that will end up being
an extended stored procedure. I've been able to get the dll loaded and
apparently executing but never returning anything other than a zero value to
the calling routines.

Any help on what I'm doing wrong is welcome.

Here's what the code looks like:

HRESULT hr = CoInitialize(NULL);
if ( FAILED(hr))
{ Return error }

_bstr_t bClr = "value B";
_bstr_t bPd = "Value C;

ICPSQLPtr pICPPd ( __uuidof( CPSQL ) );

VARIANT_BOOL retBool = pICPPd->ValueIsValid(bClr,bPd);

CoUninitialize();

The signature for the method in the class is ( _bstr_t, _bstr_t ) and
returns a VARIANT_BOOL as shown.

I'm passing values in that return a true value when the same COM object is
executed from a VB.NET program, yet I can not get anything other than a zero
to return back to the program.

Any hints?

TIA, Jim