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I am trying to extract text from PDF files using Perl. I have been using pdftotext.exe from command line (i.e using Perl system function) for extracting text from PDF files, this method works fine.
The problem is that we have symbols like α, β and other special characters in the PDF files which are not being displayed in the generated txt file. Also few extra spaces are being added randomly in the text.
Perl is one of the most popular Unix programming languages. It doesn't matter much which language you learn first because once you know how one works, it is much easier to learn others. Among languages, there is often a distinction between interpreted (e.g. Perl, Python, Ruby) and compiled (e.g. C, C, Java) languages. In this part of the Perl tutorial we are going to see how to read from a file in Perl. At this time, we are focusing on text files. In this article we see how to do this with core perl, but there are more modern and nicer ways to do this using Path::Tiny to read files. There are two common ways to. Posted on 2011-12-19 12:27-08 by jesseb Hi, I'm somewhat new to PERL and new to CAM-PDF. I'm trying to read the CAM-PDF documentation to learn how to parse pdfs, but it's a struggle. PDF files are not ASCII-based, so you cannot read a PDF file directly with basic Perl commands. But a Perl module is available that has commands you can use to read PDF file. 1.Install the CAM::PDF Module. Open a command shell with Start All Programs Accessories Command Prompt. Type “cpan” and press Enter to get the cpan prompt. In this part of the Perl tutorial we are going to see how to read from a file in Perl. At this time, we are focusing on text files. In this article we see how to do this with core perl, but there are more modern and nicer ways to do this using Path::Tiny to read files. There are two common ways to.
Is there a better and more reliable way to extract text from PDF files such that the text will include all the symbols like α, β etc and the text will exactly match the text in the PDF (i.e without extra spaces)?
brian d foy
Pawan RaoPawan Rao9 Answers
These modules you can acheive the extract text from pdf
From CPAN
This module attempts to extract sequential text from a PDF page. This is not a robust process, as PDF text is graphically laid out in arbitrary order. This module uses a few heuristics to try to guess what text goes next to what other text, but may be fooled easily by, say, subscripts, non-horizontal text, changes in font, form fields etc.
All those disclaimers aside, it is useful for a quick dump of text from a simple PDF file.
joejoeYou may never get an appropriate solution to your problem. The PDF format can encode text either as ASCII values with a font applied, or it can encode it as a bitmap. If the tool that created your PDF decided to encode the special characters as a bitmap, you will be out of luck (unless you want to get into OCR solutions, of course).
Andrew BarnettAndrew BarnettI'm not a Perl user but I imagine you'll struggle to find a better free text extractor than pdftotext.
pdftotext usually recognises non-ASCII characters fine, is it possible it's extracting them ok but the app you're using to view the text file isn't using the correct encoding? If pdftoetxt on windows is the same as the one on my linux system, then it defaults to exporting as utf-8.
Sinan ÜnürWell, I tried 2-3 perl modules like CAM::PDF, API2 but the problem remains the same! I'm parsing a pdf file containing main pages. Cam or API2 parses the plain text very well. However, they are not able to parse the code snippet [code snippet usually are in different font & encoding than plain text].
harschwarePDF2TXT.pyThis is what I use, although it is Python, it works flawlessly.
Ryan WardRyan WardJames Healy is correct. After trying CAM::PDF and PDF::API2, the former of which I've had some success reading text, downloading pdftotext worked great for a number of my implementations.
If on windows go here and download xpdf precompiled binary:http://www.foolabs.com/xpdf/download.html
Then, if you need to run this within perl use system, e.g.,:system('C:Utilitiesxpdfbin-win-3.04bin64pdftotext.exe $saveName');
where $saveName is the full path to your PDF file.
This hopefully leaves you with a text file you can open and parse in perl.
harschwarei tried this module which is working fine for special characters of pdf.
Take a look at PDFBox. It is a library but i think that it also comes with some tool to do text extracting.
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Perl is a programming language developed by Larry Wall, especially designed for text processing. It stands for Practical Extraction and Report Language. It runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial provides a complete understanding on Perl.
Why to Learn Perl?
Perl is a stable, cross platform programming language.
Though Perl is not officially an acronym but few people used it as Practical Extraction and Report Language.
It is used for mission critical projects in the public and private sectors.
Perl is an Open Source software, licensed under its Artistic License, or the GNU General Public License (GPL).
Perl was created by Larry Wall.
Perl 1.0 was released to usenet's alt.comp.sources in 1987.
At the time of writing this tutorial, the latest version of perl was 5.16.2.
Perl is listed in the Oxford English Dictionary.
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PC Magazine announced Perl as the finalist for its 1998 Technical Excellence Award in the Development Tool category.
Perl Features
Perl takes the best features from other languages, such as C, awk, sed, sh, and BASIC, among others.
Perls database integration interface DBI supports third-party databases including Oracle, Sybase, Postgres, MySQL and others.
Perl works with HTML, XML, and other mark-up languages.
Perl supports Unicode.
Perl is Y2K compliant.
Perl supports both procedural and object-oriented programming.
Perl interfaces with external C/C++ libraries through XS or SWIG.
Perl is extensible. There are over 20,000 third party modules available from the Comprehensive Perl Archive Network (CPAN).
The Perl interpreter can be embedded into other systems.
Hello World using Perl.
Just to give you a little excitement about Perl, I'm going to give you a small conventional Perl Hello World program, You can try it using Demo link.
Applications of Perl
As mentioned before, Perl is one of the most widely used language over the web. I'm going to list few of them here:
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Perl used to be the most popular web programming language due to its text manipulation capabilities and rapid development cycle.
Perl is widely known as 'the duct-tape of the Internet'.
Perl can handle encrypted Web data, including e-commerce transactions.
Perl can be embedded into web servers to speed up processing by as much as 2000%.
Perl's mod_perl allows the Apache web server to embed a Perl interpreter.
Perl's DBI package makes web-database integration easy.
Audience
This Perl tutorial has been prepared for beginners to help them understand the basic to advanced concepts related to Perl Scripting languages.
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Prerequisites
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Before you start practicing with various types of examples given in this reference, we are making an assumption that you have prior exposure to C programming and Unix Shell.