ARTICLE UNDER CONSTRUCTION

Notes

  • [[final]]
  • Open files for export or modification
  • Files larger than 2 GibiByte (2^31 2.147.483.648 bytes)
  • Error handling

Reading existing PDF files

Version 6.1.0

In this article

  • xxx

PDFsharp allows you to open and parse existing PDF files. You can do this for two reasons:

  • Open an existing document for modification.
  • Open an existing document for importing one or more of its pages and add them to another document.
  • Open an existing document for importing the content of one of its pages and draw its content like an image on a page of another document.

General

PDFReader.Open

Special behavior

PDFsharp does not preserve the object numbers of the original files.

Although PDF is a very well-specified format, some creator application create PDF files that do not comply with these specifications in every detail. PDFsharp nevertheless tries to read such documents. Here is a (incomplete) list of modifications PDFsharp makes to a document.

  • If more than one object with the same ID exists, the latest (highest offset in file) one is used.
  • If a document contains cross reference streams, all objects in such streams are converted into top level objects. When you save such a document again, it may be much larger than the original document.

Password protected documents

TODO