OCX file integration withMatlab

I hope someone can help.I created an object in Matlab using
actxcontrol. However, I can not run methods that use a pointer to a
NULL string.

In Visual Basic this is how you would call a method.

BSTR bstrAcquDate = NULL;
long nRet = XRawfileCtrl.GetAcquisitionDate (&bstrAcquDate);


Does anyone know how to do it in Matlab? I need to declear a NULL
string and then a pointer to that string in order to run that
command. Any ideas?

Thanks
.

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