Find empty space

  • Hi,

    I managed to find an empty space in my PDF document.
    But I have another problem. I want to add a barcode to a PDF. I have a special Barcode-Font. This works on PDFs which are created on the Pc but not on scanned PDFs. On scanned PDFs I get an eror in Adobe Reader "Font ?????? could not be displayed".
    Has anyone an idea?