title: Library to read ms-office Doc(doc, docx, etc.), pdf, hwp, ... on C++
body: <p>I need library to read text from files such as doc, docx, xls, xlsx, hwp, pdf, etc. on c++.</p>
  
  <p>I think there is a library to support this function but i have googled it and found none.</p>
  
  <p>I'll keep searching but can somebody introduce any library to me?</p>