I am using apache pdfbox framework to read pdf text content.
I have to get the content from "Table of Content" page (if present in the pdf), should be able to identify the Table of content page through pdfbox api.
kindly provide your suggestions.
The table of content in a PDF file is not easily identified by any structure you can just pull from the PDF document. You will have to do text extraction and identify the table of content by its properties.
PDF in general doesn't contain content structure such as table of contents, chapters, headers, footers or even paragraphs or lines of text.
Related
I use SQLite to search reference information of products related to a PDF Catalog file. Present the results in a Table View and when the user select one, show the PDF Catalog in the page of the product selected.
The problem is how i can highlight the reference found (is text)? I show the PDF file with WebKit.
I am trying to create a PDF in BIRT and I need to have bookmarks linking from a summary page to each detail page. The links work fine in the HTML preview and a similar http link works in published PDFs. However, the internal links do not work in the PDF format.
What I have tried so far is setting the bookmark property to "detail_" + row["nodeid"] and setting the hyperlink to the same. As stated, this works for the HTML preview, but not the PDF export.
The PDF has automatically generated TOC items that I would prefer to leverage off, but I don't know how to link to those.
Is there a way that I can get the PDF output to contain the required links using either bookmark properties, or the generated TOC items?
Sample PDF output (Customer data removed, alternate locations selected)
The solution to the problem lies not in the format of the bookmark/hyperlink, but in the placement of the bookmark.
The problem was, I was placing the bookmark on the row of the table I wanted to link to. Instead, the bookmark needed to be on the label in the first column of the row.
I believe the issue is that, in the HTML version, the table row is a <tr> tag, however in the PDF, the row doesn't physically exist, so there's nothing to set the bookmark on. However the label/text item exists in both versions, so the bookmark is created correctly.
I have two pdfs both with limited data i.e. Single page. I want to merge the data of one pdf into another pdf but on the single page (It should not create the other page to append the external data). Is there any way to do this using pdfbox or pdfclown ?
I'm writing a PDF generation library and wanted to add the the ability to use other PDFs as templates. The specification notes a TemplateInstantiatedproperty on pages with the alias of the template object should be all that is needed.
Here is a gist of the pdf content:
https://gist.github.com/tyre/89c12f8203181f078001
The template itself is stored in object 16 and the page in object 19.
qpdf --check reports the PDF as invalid:
WARNING: tmp/alpaca.pdf: file is damaged
WARNING: tmp/alpaca.pdf (file position 32089): xref not found
WARNING: tmp/alpaca.pdf: Attempting to reconstruct cross-reference table
checking tmp/alpaca.pdf
PDF Version: 1.7
File is not encrypted
File is not linearized
I'm afraid your PDF document is completely and utterly broken and that you have misunderstood a number of key concepts. You cannot simply incorporate a complete PDF file into another PDF file in the way you have done and expect that to work.
The template system you are referring to is intended to include "hidden" pages - not referenced in the pages tree in the PDF file - in the context of an interactive form document (or interactive document in general). That doesn't sound like what you are intending to do. And these pages need to be valid PDF pages. You can in other words not just include the original PDF document verbatim and expect the PDF reader to sort things out; you need to insert a syntactically correct PDF page object.
What you want to do is take the content of a document and apply that as a background to a document. This most commonly is done using XObjects. Pseudo-code for this could be:
Open the original PDF document
Open the "template" document
Read the template document and copy all elements from the template page into a newly created XObject in the original PDF document.
Modify the page contents of the pages in the original PDF document to paint the new XObject at the beginning of the page description of the existing pages.
It's important to note that again, you're not supposed to simply insert the template document into the stream for the newly created XObject. You will have to create a valid XObject that contains a properly formed resources dictionary referencing all resources needed by your XObject, and that contains the content stream from your template document.
As already indicated in comments, the PDF presented by the OP is structurally defect, the cross reference table position and entries are wrong. Furthermore the transition from one PDF revision to a next update looks questionable. Essentially, therefore, the OP will have to provide a sample PDF which is at least syntactically correct.
That been said, though, the OP indicated he was
writing a PDF generation library and wanted to add the the ability to use other PDFs as templates. The specification notes a TemplateInstantiatedproperty on pages with the alias of the template object should be all that is needed.
The Named Pages mechanism is not meant for something like that. Its main current use (if it is used at all) is in the context of spawning page templates by Acroform actions.
For using pages from other PDFs, one can simply copy them (and the referenced other objects) from the source PDF if they are to be used as separate pages as is; and if multiple templates are to be put onto a single target page, one can wrap the copied sources into form xobjects and include them in the target page.
Does pdf has styles, headers and footers information as docx file have separate xml files for these?
Regular PDFs don't have styles, but different fonts (for instance Helvetica is one font, Helvetica-Bold is another font of the same family).
They don't have headers and footers, just like they don't have paragraphs, section titles, table rows or table cells. Everything you see in a PDF page, is just a bunch of glyphs and paths and shapes drawn on a canvas.
However: if your PDF is a Tagged PDF, the PDF contains something that is known as the StructTreeRoot. This means that, apart from the presentation of the content, you also have a tree structure that stores the semantics of the content. This structure contains references to the content on the different pages, allowing you (for instance) to find out which lines belong together in a paragraph, which parts of the page are "artefacts" (such as a repeating header or footer), which content is organized as a table, etc...
Tagged PDF is a requirement for PDF/A Level A and PDF/UA documents. A majority of the PDF files you can find in the wild aren't tagged (properly).