Могу дать ссылки:Hardware Interface Programming in VC++ – Part I (Port Access)И там внизу статьи еще:Driver Development Part 1: Introduction to DriversThis article will go into the basics of creating a simple driver.Driver Development Part 2: Introduction to Implementing IOCTLsThis article will go deeper into the basics of creating a simple driver.A simple demo for WDM Driver developmentWDM Driver programming introduction with three Pseudo Drivers.API hooking revealedThe article demonstrates how to build a user mode Win32 API spying system
Также следует почитать Microsoft Platform SDK Help. Вот пример оттуда для СОМ порта, для LPT наверное аналогично, сам не пробовал
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