blocks|key|316544|text|关于xactpro的PDF+File+Parser文章似乎正是您所需要的。它解释了PDF的格式，并附带了解析器的完整源代码(以及用于模型可视化的另一个项目)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|316545|解析器使用特定于格式的术语，但您可以很容易地使用可视化工具来了解要查找的内容。|316546|entityMap|0|LINK|mutability|MUTABLE|url|http://www.xtractpro.com/articles/PDF-File-Parser.aspx^0|A|F|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

The <a href="http://www.xtractpro.com/articles/PDF-File-Parser.aspx" rel="noreferrer">PDF File Parser</a> article on xactpro seems to be exactly what you need. It explains the format of the PDF and comes with full source code for a parser (and another project for visualisation of the model).

The parser uses format-specific terms, but you could easily use the visualiser to learn what to look for.

blocks|key|4381768|text|你也可以看看Xpdf+(http://www.foolabs.com/xpdf/download.html)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4381769|entityMap|0|LINK|mutability|MUTABLE|url|http://www.foolabs.com/xpdf/download.html^0|C|15|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can also take a look at Xpdf (<a href="http://www.foolabs.com/xpdf/download.html" rel="nofollow noreferrer">http://www.foolabs.com/xpdf/download.html</a>)

blocks|key|1025932|text|不确定它是否支持您需要的功能，但我们已经成功地使用了abcPDF。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1025933|entityMap|0|LINK|mutability|MUTABLE|url|http://www.websupergoo.com/products.htm#pd^0|Q|6|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Not sure if it supports the functionality you need, but we've been using <a href="http://www.websupergoo.com/products.htm#pd" rel="nofollow noreferrer">abcPDF</a> with some success.

blocks|key|316613|text|查看pdfbox|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316614|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

blocks|key|4381850|text|abcPDF确实允许您提取注释，它们在帮助中有一个非常好的部分，但处理它的代码通常是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4381851|++++for+(int+objectIndex+=+0;+objectIndex+<+theDoc.ObjectSoup.Count;+objectIndex%2B%2B)
++++++++{
++++++++++++try
++++++++++++{
++++++++++++++++IndirectObject+element+=+theDoc.ObjectSoup.ElementAt(objectIndex);

++++++++++++++++string+elementType+=+element.GetType().ToString();
++++++++++++++++switch+(elementType)
++++++++++++++++{
++++++++++++++++++++case+"WebSupergoo.ABCpdf8.Objects.Annotation":
+++++++++++++++++++++++//process+the+annotation,+which+could+be+all+kinds+of+stuff
++++++++++++++++++++++++WebSupergoo.ABCpdf8.Objects.Annotation+annotation+=+(WebSupergoo.ABCpdf8.Objects.Annotation)element;+

++++++++++++++++++++++++ProcessAnnotation(annotation);|code-block|syntax|javascript|4381852|..。|4381853|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

abcPDF does let you extract annotations, they have a very good section in the help for it, but the code to handle it is generally : 

<pre><code> for (int objectIndex = 0; objectIndex &lt; theDoc.ObjectSoup.Count; objectIndex++)
 {
 try
 {
 IndirectObject element = theDoc.ObjectSoup.ElementAt(objectIndex);

 string elementType = element.GetType().ToString();
 switch (elementType)
 {
 case "WebSupergoo.ABCpdf8.Objects.Annotation":
 //process the annotation, which could be all kinds of stuff
 WebSupergoo.ABCpdf8.Objects.Annotation annotation = (WebSupergoo.ABCpdf8.Objects.Annotation)element; 

 ProcessAnnotation(annotation);
</code></pre>

...

blocks|key|3534477|text|我不知道这些PDF解析器的所有功能，但Aspose有一个相当全面的功能。不幸的是，我们确实遇到了两个bug，我已经等了很长时间才能修复它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3534478|ITextSharp似乎是.Net最常见的开源解析器。|3534479|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I don't know all the features of these PDF parsers, but Aspose has a pretty comprehensive one. We did, unfortunately, come across two bugs, and I've been waiting a long time for them to be fixed.

ITextSharp seems to be the most common open source PDF parser for .Net.

Does anyone know of a PDF file parser that I could use to pull out sections of text from the plaintext pdf file? Specifially I want a way to be able to reliably pull out the section of text specific to annotations?

Delphi, C# RegEx I dont mind.

Looking for a PDF file parser

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有没有人知道一个PDF文件解析器，我可以用它来从纯文本pdf文件中提取部分文本？具体地说，我希望有一种方法能够可靠地拉出特定于注释的文本部分。Delphi，C# RegEx我不介意。

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