![combine pdfs combine pdfs](https://images.sftcdn.net/images/t_optimized,f_auto/p/44872c1c-96d6-11e6-b532-00163ed833e7/1555557912/pdfmerge-screenshot.jpg)
Hence, PDF files that have heavily nested objects, as well as those that where combined in a way that results in cyclic nesting, might explode the stack - resulting in an exception or program failure.ĬombinePDF is written natively in Ruby and should (presumably) work on all Ruby platforms that follow Ruby 2.0 compatibility.
COMBINE PDFS CODE
The CombinePDF gem runs recursive code to both parse and format the PDF files. I find it better to err on the side of caution, although for optional content PDFs an exception is avoidable using CombinePDF.load(pdf_file, allow_optional_content: true). Sometimes the CombinePDF will raise an exception even if the PDF could be parsed (i.e., when PDF optional content exists). Some encrypted PDF files (usually the ones you can't view without a password) will fail quietly instead of noisily. Some links will be lost when ripping pages out of PDF files and merging them with another PDF. Keeping this information requires merging the PDF objects rather then their pages. Some links and data (URL links and PDF "Named Destinations") are stored at the root of a PDF and they aren't linked back to from the page. You can fix this by adding content to the pages before merging the PDF files (i.e. When unifying the same TOC data more then once, one of the references will be unified with the other (meaning that if the pages look the same, both references will link to the same page instead of linking to two different pages).
![combine pdfs combine pdfs](https://static.javatpoint.com/tutorial/pdf/images/merge-pdf-files.png)
I couldn't fix this because this is how PDF forms work (filling a field fills in the data in any field with the same name), but frankly, I kinda liked the issue. When combining PDF Forms, form data might be unified.
![combine pdfs combine pdfs](https://static-ak.pdffiller.com/assets/manuals/categories/merge-page/merge-1.png)
I tried fixing this to the best of my ability, but I'm not sure it all works just yet. When reading PDF Forms, some form data might be lost. Please hit me up if you would like to join in and eventually take over. I love this gem, but I feel it's time I took a step back from maintaining it and concentrate on my music and other things I want to develop. However, during the last three years or so I have been maintaining the project for no reason at all, except that I enjoyed sharing it with the community. I wrote this gem because I needed to solve an issue with bates-numbering existing PDF documents. I need help maintaining the CombinePDF Ruby gem.