如何使用PDF / A格式编程构建PDF [英] How to programmaticaly construct PDFs with PDF/A format

问题描述

我需要编写一个.NET应用程序，它将从数据库中获取各种数据并构建一个PDF，由于公司标准，它必须是PDF / A格式。

I need to write a NET application that will take various data from databases and construct a PDF which must be in PDF/A format because of the companies standards.

到目前为止，我已经查看了PDFSharp和iTextSharp

So far I have looked at PDFSharp and iTextSharp

我在PDFSharp论坛中看到一个主题 http://forum.pdfsharp.net/viewtopic.php?p=1293#p1293 讨论这个话题，他们多年前已经说过PDF / A支持在他们的待办事项列表中，但没有任何结果。

I see a topic in PDFSharp forums http://forum.pdfsharp.net/viewtopic.php?p=1293#p1293 dicussing this very topic and they have said years ago that PDF/A support is in their todo list, but nothing came of it.

我找不到任何有关使用这些库的PDF / A格式的信息。我是否需要在满足PDF / A限制的同时构建PDF？我不知道如何验证文件是PDF / A格式......

I cannot find any information about PDF/A format using these libraries. Do I need to build the PDFs while meeting PDF/A restrictions? I do not know how to verify a file is in PDF/A format...

推荐答案

参见发行说明和更改日志。

您可以创建PDF / A-1（A级/ B级），PDF / A-2和使用iTextSharp的PDF / A-3文件。但是，我们仅在PDF / A-1的创建过程中检查一致性。如果您创建PDF / A-2和PDF / A-3文件，作为开发人员，您有责任不介绍破坏PDF / A一致性的内容。在未来的版本中，iText会为您检查。

You can create PDF/A-1 (level A / level B), PDF/A-2 and PDF/A-3 files using iTextSharp. However, we only check conformance during the creation process for PDF/A-1. If you create PDF/A-2 and PDF/A-3 files, it's your responsibility as a developer not to introduce something that breaks PDF/A conformance. In future versions, iText will check that for you.

带有iText的PDF / A-3 让您了解所需内容（示例是Java中的，但将它们移植到C＃应该不是问题）。确保使用 PdfAWriter 类而不是 PdfWriter ，并确保您拥有最新版本。

PDF/A-3 with iText gives you an idea of what is needed (the examples are in Java, but it shouldn't be a problem to port them to C#). Make sure you use the PdfAWriter class instead of PdfWriter, and make sure you have the latest version.

请注意，创建PDF / A Level A是一项挑战。您必须在代码中设置每个元素（段落， Anchor ，...）的角色。通常，使用XFA模板，填充XFA数据，然后让iText的XFA工作人员将其展平，就容易得多。

Note that creating PDF/A Level A is a challenge. You have to set the role of every element (Paragraph, Anchor,...) in your code. Often it's much easier to use an XFA template, fill it with XFA data, and then have iText's XFA Worker flatten it.

iText不会对现有PDF进行验证一个文件。重要的是要知道文档顶部显示的蓝条，说文档是PDF / A，是不够的。您需要验证文档，例如使用Adobe Acrobat（预检功能）。

iText doesn't do verification of existing PDF/A files. It's important to know that the 'blue bar' shown on top of the document, saying that the document is PDF/A, isn't sufficient. You need to verify the document, for instance using Adobe Acrobat (Preflight functionality).

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