I appreciate your kind help so much, it certainly does make sense that the majority of the code would be written in C or C++ 🙂
Thank you for such a speedy reply, I hope you have a truly wonderful rest of the day!! 🙂
In order to display a PDF, it must first be parsed. So to start you'll need to understand the internals of PDF. You can purchase the lastest ISO 32000 spec for about $170 USD.
Next, writing you're own PDF parser is an extremely daunting task. I'd suggest using one of the many fine PDF libraries out there. Many of them provide a display window of some type. So you don't even have to write that.