Thank you very much !
This is what I expected : I had not search enough to find
PDFDoc(BaseStream *strA...
I start on that..
On 7/18/21 3:44 AM, William Bader wrote:
utils/pdfunite.cc opens its input files with PDFDoc *doc = new
PDFDoc(gfileName, NULL, NULL, NULL)
poppler/PDFDoc.h also provides PDFDoc(BaseStream *strA, GooString
*ownerPassword = NULL, GooString *userPassword = NULL, void *guiDataA
= NULL)
poppler/Stream.h provides MemStream(char *bufA, Goffset startA,
Goffset lengthA, Object &&dictA) that you could probably use
like MemStream *mStream = new MemStream(s->getCString(), 0,
s->getLength(), Object(objNull))
So if you are lucky, you can make a MemStream for each in-memory PDF,
then make a PDFDoc for each MemStream, and then cut-and-paste the code
in pdfunite.cc that combines the PDFDoc objects.
Running "pdfunite <(cat a.pdf) <(cat b.pdf) ab.pdf" from bash fails
with "Syntax Error: Document stream is empty" "Syntax Error: Could not
merge damaged documents ('/dev/fd/63')", so PDFDoc might require input
that is seekable, so if you are using std::istream, if the underlying
data is from a stringstream, it might work, but if it is from an
fstream, you might have to read it all into a buffer.
William
------------------------------------------------------------------------
*From:* poppler <poppler-boun...@lists.freedesktop.org> on behalf of
Pierre Couderc <pie...@couderc.eu>
*Sent:* Saturday, July 17, 2021 5:33 PM
*To:* poppler@lists.freedesktop.org <poppler@lists.freedesktop.org>
*Subject:* Re: [poppler] How to "pdfunite" in memory...?
On 7/17/21 8:43 PM, Oliver Sander wrote:
>> I do not understand well your question. But I know that a pdf
>> document contains pages.
>>
>> I have pdf documents in memory (read from a database) and I need to
>> merge these documents in memory to write them back in a database...
>
> You need to give a few more details about what you mean by "I have pdf
> documents in memory".
> Does that mean that you simply copied the file content to some
> allocated memory? Or have
> you opened these pdf files using poppler (using code like in
> poppler/qt5/demos)?
>
> You need to do the latter to solve your problem. Open the files using
> poppler,
> and then copy code that unites them from pdfunite.cc (licences
> permitting).
>
> Best,
> Oliver
>
Sorry to not be clear : I upload pdf documents (with a c++ cppcms
server), I get them in some std::istream, I need to manipulate pages of
these documents, create new documents from these pages, store these
documents in bytea postgresql db, extract text from them, retrieve them
when a user ask to download them...
poppler can make the job, but I do not need and I would like to avoid to
use files to do all that...
So my question : what is the best strategy ?
I have no license problem, all is open source.
Thank you
PX.
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