如何生成在文档查看器中工作的纯文本源代码PDF示例？ [英] How to generate plain-text source-code PDF examples that work in a document viewer?

问题描述

我刚刚找到了 Adob​​e论坛：简单文字字串范例中的规格破碎，因此我有兴趣找到纯文本源代码PDF示例。

I just found the post Adobe Forums: Simple Text String Example in specification broken., so I got interested in finding plain-text source code PDF examples.

所以，通过那篇文章，我终于找到了：

So, through that post, I eventually found:

• a href =http://www.adobe.com/devnet/pdf/pdf_reference.html =nofollow> PDF参考和Adobe扩展到PDF规范| Adobe开发人员连接;其中包含：
  
  
  
  • PDF 文档管理 - 可移植文档格式 - 第1部分：PDF 1.7，第一版（PDF32000_2008.pdf）
  
  
  • The webpage PDF Reference and Adobe Extensions to the PDF Specification | Adobe Developer Connection ; which contains:
    • The PDF Document Management – Portable Document Format – Part 1: PDF 1.7, First Edition (PDF32000_2008.pdf)

    PDF 1.7规格在第699页附录_Annex H（informative）PDF档案范例;并从那里，我想尝试H.3简单文本字符串示例（经典Hello World）。

    The PDF 1.7 spec has on page 699 appendix "_Annex H (informative) Example PDF files"; and from there, I wanted to try "H.3 Simple Text String Example" (the "classic Hello World").

    所以我试图将它保存为 hello.pdf （_except注意，当您从PDF32000_2008.pdf，您可能会得到％PDF-1。4 - 即在 1。 be removed_）：

    So I tried to save this as hello.pdf (_except note when you copy from the PDF32000_2008.pdf, you may get "%PDF-1. 4" - that is, a space inserted after 1., which must be removed_) :

    %PDF-1.4
    1 0 obj
      << /Type /Catalog
          /Outlines 2 0 R
          /Pages 3 0 R
      >>
    endobj
    
    2 0 obj
      << /Type /Outlines
          /Count 0
      >>
    endobj
    
    3 0 obj
      << /Type /Pages
          /Kids [ 4 0 R ]
          /Count 1
      >>
    endobj
    
    4 0 obj
      << /Type /Page
          /Parent 3 0 R
          /MediaBox [ 0 0 612 792 ]
          /Contents 5 0 R
          /Resources << /ProcSet 6 0 R
          /Font << /F1 7 0 R >>
      >>
    >>
    endobj
    
    5 0 obj
      << /Length 73 >>
    stream
      BT
        /F1 24 Tf
        100 100 Td
        ( Hello World ) Tj
      ET
    endstream
    endobj
    

    ...我正尝试打开它：

    ... and I'm trying to open it:

    evince hello.pdf
    

    ...但是，evince无法打开它：无法打开文档/ PDF文档已损坏;还有：

    ... however, evince cannot open it: "Unable to open document / PDF document is damaged"; and also:

    Error: PDF file is damaged - attempting to reconstruct xref table...
    Error: Couldn't find trailer dictionary
    Error: Couldn't read xref table
    

    a href =http://qpdf.sourceforge.net/files/qpdf-manual.html =nofollow> qpdf ：

    I also check with qpdf:

    $ qpdf --check hello.pdf
    WARNING: hello.pdf: file is damaged
    WARNING: hello.pdf: can't find startxref
    WARNING: hello.pdf: Attempting to reconstruct cross-reference table
    hello.pdf: unable to find trailer dictionary while recovering damaged file
    

    我在哪里出错？

    非常感谢任何答案，
    
    干杯！

    Many thanks in advance for any answers,
    Cheers!

    推荐答案

    您应该在（语法正确的） xref 和 trailer 文件。这意味着：PDF中的每个对象在外部参照表中都需要一行，即使字节偏移没有正确说明。然后Ghostscript，pdftk或qpdf可以重新建立正确的外部参照并渲染文件：

    You should append a (syntactically correct) xref and trailer section to the end of the file. That means: each object in your PDF needs one line in the xref table, even if the byte offset isn't correctly stated. Then Ghostscript, pdftk or qpdf can re-establish a correct xref and render the file:

    [...]
    endobj
    xref 
    0 8 
    0000000000 65535 f 
    0000000010 00000 n 
    0000000020 00000 n 
    0000000030 00000 n 
    0000000040 00000 n 
    0000000050 00000 n 
    0000000060 00000 n 
    0000000070 00000 n 
    trailer 
    <</Size 8/Root 1 0 R>> 
    startxref 
    555 
    %%EOF 
    

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