API for Poker Tables

We need Visual C++ V6 compatible library that provides an API to poker web sites. Initially it is to work with PartyPoker but we intend to ultimately support many other tables. Preferable screen-scraping should not be used. If this is not possible the solution must be such that it can be modified relatively easily by us if the site changes. API must provide all information visible on table for all players and must be interactive, i.e. allow bet/call/fold etc at any point.