Retrieving Digital Signature from memory?

Would like to use the digital signature (i.e. PKI) from a smart card to authorize a PDF document. Is it possible to retrieve the PKI from Windows once its read in via the smart card using some sort of C++ or Java API call to apply it to the PDF form?

It is possible to retrieve the smartcard certificate. You should post on a Windows forum for details on how to achieve this.

Thanks
Laurentiu