El 15/06/2019 a las 13:56, Graeme Geldenhuys via lazarus escribió:
On 14/06/2019 6:19 pm, Rogério Martins via lazarus wrote:
Is there a function for read info about a pdf file ? I need to know the
number of pages in a given pdf file.
I don't know of a Object Pascal library you can you, but there is an
alternative. The PDF fromat is a mixture of text and binary. You can
search for text as follows:
/Type /Pages
/Count 45
After the "/Type /Pages" there should be a "/Count <n>" line which
contains the page count. Hope that helps.
It is not completely reliably.
I used to search "/Type /Pages", but a day I couldn't find it, after
digging a little in the PDF, I discovered that the number of pages was
stored in a compressed stream. PDF can sore any data in a compressed
stream and they decided to compress page information. And since then I
have begun to find it more frequently. I suppose that once you have the
frame work to compress stream, why not compress everything. I can't see
what are the advantages of compressing a few bytes, but it's there.
Now I try to search "/Type /Pages" and if I can't find it I call a
external utility "pdftk"
--
Saludos
Santiago A.
--
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