HOW CAN WE SEARCH PDF ?

<p>Hi, Im doing a small project in C++ in LINUX PLATFORM.i need to search 10 or more PDF files and find required data.how can i do so?. i will make my question more clear with following eg</p> <p>suppose i have ten text books all about c++ and i need info about the topic array and how i can search the pdf and find data?</p> <p>thanks in advance</p>