Alright, I've made a bit more progress on debugging this, but its only
gotten stranger. I believe the root cause is that a couple of objects
are being duplicated (9 and 11 I think in the document I attached). The
weird part is that it seems like the duplicates come all the way from
PdfDocument::Append which is strange because the code there should be
the same for both the PdfMemDocument and PdfStreamedDocument. Yet the
duplicate detecting code I added in PdfVecObjects::push_back doesn't
complain when I'm using a PdfMemDocument to merge into. I'm really
perplexed here and any insight will be helpful.
- Mike Slegeir
Mike Slegeir wrote:
> I've narrowed this down a little. It looks like the problem is writing
> out the XRef and Trailer. The XRef overlaps itself at a few points
> (that's valid though, right?) and so the trailer's listed size comes
> from the last XRef subsection's first object and count (which is wrong
> because the last subsection was a short, overlapping subsection). I'm
> attaching a PDF generated from the PdfStreamedDocument merging. If
> someone with a better understanding could take a look at the XRef, I'd
> appreciate it. Thanks.
>
> - Mike Slegeir
>
> Mike Slegeir wrote:
>
>> I'm trying to use PdfStreamedDocument like so:
>>
>>
>>> PoDoFo::PdfStreamedDocument doc(out_filename);
>>>
>>> for(int i=0; i<num_inputs; ++i) {
>>> doc.Append( PoDoFo::PdfMemDocument(in_filenames[i]) );
>>> }
>>>
>>> doc.Close();
>>>
>>>
>> but the result is just two blank pages. I'm currently doing something
>> like this:
>>
>>
>>> PoDoFo::PdfMemDocument doc;
>>>
>>> for(int i=0; i<num_inputs; ++i) {
>>> doc.Append( PoDoFo::PdfMemDocument(in_filenames[i]) );
>>> }
>>>
>>> doc.Write(out_filename);
>>>
>>>
>> which works perfectly fine. Is anyone able to offer some insight on why
>> this doesn't work or any technical reasons that it shouldn't? I'd like
>> to be able to use PdfStreamedDocument for this as merging lots of
>> documents can take up a lot of memory seemingly unnecessarily.
>>
>> - Mike Slegeir
>>
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