Hi Zyx
Thanks for the input which got me to write the following code. I cannot get
it to work fully. I get the correct page size with lines, but actual pages
are not copied over.
Perhaps you can spot my error? Also it's not clear which pointers I should
delete, as documentation does not state this.
PoDoFo::PdfMemDocument* PdfPageAppender::createSinglePageDocument(const
PoDoFo::PdfMemDocument& sourceDocument, const bool drawPageSeparatorLine)
{
PdfMemDocument* document = new PdfMemDocument();
// first pass to find size of destination single page
PdfRect rect;
for (int idx = 0, count = sourceDocument.GetPageCount(); idx < count; idx++)
{
const PdfPage* spage = sourceDocument.GetPage(idx);
const PdfRect pagesize = spage->GetPageSize();
if (pagesize.GetWidth() > rect.GetWidth())
rect.SetWidth(pagesize.GetWidth());
rect.SetHeight(rect.GetHeight() + pagesize.GetHeight());
}
PdfPage* page = document->CreatePage(rect);
PdfPainter painter;
painter.SetPage(page);
// second pass to copy source pages to destination single page
double dY = 0;
for (int idx = 0, count = sourceDocument.GetPageCount(); idx < count; idx++)
{
PdfPage* spage = sourceDocument.GetPage(idx);
try
{
// PdfXObject* xobj = new PdfXObject(spage->GetObject()); // <- Exception:
ePdfError_InvalidDataType (20)
PdfXObject* xobj = new PdfXObject(spage->GetContentsForAppending()); // <-
Nothing, except the lines, gets drawn on target, but Acrobat Reader shows
an error when opening destination PDF
painter.DrawXObject(0, dY, xobj);
if (drawPageSeparatorLine)
{
// TODO: set color and line settings (dashed)
painter.DrawLine(0, dY, rect.GetWidth(), dY);
}
dY += spage->GetPageSize().GetHeight();
}
catch (const PdfError& ex)
{
logEvent(EID_ERROR,
StringHelp::local8ToText(PdfError::ErrorMessage(ex.GetError())));
}
}
painter.FinishPage();
return document;
}
Thanks in advance!
/Jacob
On Mon, Feb 18, 2019 at 8:46 AM zyx <z...@gmx.us> wrote:
> On Fri, 2019-02-15 at 13:14 +0100, Jacob Pedersen wrote:
> > Can this type of merge be done?
>
> Hi,
> yes, it can be done.
>
> I guess you want a bit more detailed response, thus: you can use the
> original pages as XObject-s and draw them into your new pages. Drawing
> a line is a primitive operation supported by the PDF standard.
>
> I do not know whether any of the PoDoFo tools or examples provide any
> such code, I'm sorry. [1]
> Bye,
> zyx
>
> [1] Something similar, but not the same, is here:
> https://litepdf.sourceforge.io/pagesperpage.cpp.html
>
>
>
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