Get PDF file and put text on it

Hello!
I have a PDF file - for example 10004234.pdf.
I would like to put the some text on it (in specific place - for example 4 cm from the bottom and 2cm from the left) and send it to the printer...

How to read (open) and put the text on the PDF file?

Qt does not have any direct support for reading / displaying / editing PDF files. You can print to PDF if you install a PDF printer on your system or you can use QPdfWriter to write PDF directly to a file using QPainter commands. There are third-party libraries (poppler is one) that allow you to manipulate PDF files, but these are not part of the Qt framework.