How to read ISBN from eBooks on CHM or PDF files

Question

I'm doing a database for storing my eBook collection.
Most of them have the ISBN within the text of the book itself.
How can I access this contents?
Is there any sourcecode or DLLs for doing that?

Answer 1

I did it for eBook library app. First of all you need to extract text from chm or pdf file. There are a lot of utilities\libraries to do it. Here is an article on CodeProject on how to extract content from CHM files. For PDF files I used pdftotext utility. When you get plain text from eBook parse it using regular expression to find ISBN10/13 code.