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utils/pdfunite.cc opens its input files with PDFDoc *doc = new PDFDoc(gfileName, NULL, NULL, NULL)</div>
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poppler/PDFDoc.h also provides PDFDoc(BaseStream *strA, GooString *ownerPassword = NULL, GooString *userPassword = NULL, void *guiDataA = NULL)</div>
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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))</div>
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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.<br>
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.</div>
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William</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> poppler <poppler-bounces@lists.freedesktop.org> on behalf of Pierre Couderc <pierre@couderc.eu><br>
<b>Sent:</b> Saturday, July 17, 2021 5:33 PM<br>
<b>To:</b> poppler@lists.freedesktop.org <poppler@lists.freedesktop.org><br>
<b>Subject:</b> Re: [poppler] How to "pdfunite" in memory...?</font>
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<div class="PlainText">On 7/17/21 8:43 PM, Oliver Sander wrote:<br>
>> I do not understand well your question. But I know that a pdf <br>
>> document contains pages.<br>
>><br>
>> I have pdf documents in memory (read from a database) and I need to <br>
>> merge these documents in memory to write them back in a database...<br>
><br>
> You need to give a few more details about what you mean by "I have pdf <br>
> documents in memory".<br>
> Does that mean that you simply copied the file content to some <br>
> allocated memory? Or have<br>
> you opened these pdf files using poppler (using code like in <br>
> poppler/qt5/demos)?<br>
><br>
> You need to do the latter to solve your problem. Open the files using <br>
> poppler,<br>
> and then copy code that unites them from pdfunite.cc (licences <br>
> permitting).<br>
><br>
> Best,<br>
> Oliver<br>
><br>
Sorry to not be clear : I upload pdf documents (with a c++ cppcms <br>
server), I get them in some std::istream, I need to manipulate pages of <br>
these documents, create new documents from these pages, store these <br>
documents in bytea postgresql db, extract text from them, retrieve them <br>
when a user ask to download them...<br>
<br>
poppler can make the job, but I do not need and I would like to avoid to <br>
use files to do all that...<br>
<br>
So my question : what is the best strategy ?<br>
<br>
I have no license problem, all is open source.<br>
<br>
Thank you<br>
<br>
PX.<br>
<br>
<br>
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