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How to read ISBN from e-books on CHM or PDF files

I am making a database to store my collection of e-books.
Most of them have ISBN in the text of the book itself.
How can I access this content? Is there any source code or DLLs for this?

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I did this for the eBook library application. First of all, you need to extract the text from the chm or pdf file. There are many utilities \ libraries for this. The following is an article in a CodeProject article on how to extract content from CHM files. For pdf files, I used the pdftotext utility . When you get plain text from an eBook, use its regular expression to find the code ISBN10 / 13.

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Extracting text from CHM and PDF is the first step. Then you can find the regular expression ISBN .

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