使用iTextSharp从PDF文件提取文本时，出现此错误:&“找不到图像数据或EI&". [英] While extracting text from PDF file using iTextSharp, I am getting this error: "Could not find image data or EI"

问题描述

使用iTextSharp从PDF文件提取文本时，出现此错误:找不到图像数据或EI"

While extracting text from PDF file using iTextSharp, I am getting this error: "Could not find image data or EI"

在仅包含图像的特定页面上会发生此错误.

This error occurs on particular pages that contains image only.

原因可能是因为我试图提取文本而不检查页面中是否有文本内容?

Could the reason be because I am trying to extract the text without checking whether there is any text content in the page?

推荐答案

在PDF规范中没有很好地指定嵌入式图像.图像数据应包含在ID和EI运算符之间.但是图像数据本身可能包含"EI". 在iText(Sharp)中，读取图像数据，直到遇到<whitespace>EI<whitespace>.但是，有些PDF以EI<whitespace>作为内嵌图像数据的结尾.对于那些内联图像，iText(Sharp)会抛出此异常.

Inline images are not specified very well in the PDF specification. The image data should be contained between ID and EI operators. But there's a possibility the image data itself contains "EI". In iText(Sharp) image data is read until <whitespace>EI<whitespace> is encountered. However, there are PDFs that have EI<whitespace> as the end of inline image data. For those inline images iText(Sharp) throws this exception.

如果这是您的PDF的问题，则可以通过在以下位置将InlineImageUtils.ParseInlineImageSamples()中的found == 1更改为found <= 1来解决它: http ://sourceforge.net/p/itextsharp/code/HEAD/tree/trunk/src/core/iTextSharp/text/pdf/parser/InlineImageUtils.cs#l337

If this is the issue with your PDF, you can probably fix it by changing found == 1 to found <= 1 in InlineImageUtils.ParseInlineImageSamples() here: http://sourceforge.net/p/itextsharp/code/HEAD/tree/trunk/src/core/iTextSharp/text/pdf/parser/InlineImageUtils.cs#l337

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