Lazarus

Programming => General => Topic started by: loaded on January 27, 2022, 05:19:56 pm

Title: [Solved] How to search for value in pdf?
Post by: loaded on January 27, 2022, 05:19:56 pm
Hi All,
I will have to do a study on this subject soon.
For example, can I access the id value in the attached pdf using stream?
I would be very pleased if friends who have experience and knowledge express their ideas and suggestions. Respects.
Title: Re: How to search for value in pdf?
Post by: winni on January 27, 2022, 06:48:24 pm
Hi!

There is the linux tool pdftotext with this simple syntax:

Code: Bash  [Select][+][-]
  1. pdftotext some.pdf some.txt
  2.  

It is from the llinux package Xpdf.  This was ported to Windows.

The output for your sample is this:

Code: Text  [Select][+][-]
  1. Çalışma Sayfası1
  2.  
  3. Id
  4.  
  5. 9960515081
  6.  
  7. Sayfa 1
  8.  
  9. L
  10.  

Winni
Title: Re: How to search for value in pdf?
Post by: loaded on January 27, 2022, 07:03:40 pm
winni my esteemed brother,
Thank you very much for taking your precious time to reply.
I put your suggestion at the top of my to-try list.
If I can't solve it by reading binary directly or if I can't find another solution, I will definitely use it.
Title: Re: How to search for value in pdf?
Post by: Jurassic Pork on January 28, 2022, 01:17:41 pm
hello,
it is also possible with Python4Lazarus using the module pymupdf( including mupdf library):
Script python to execute from Lazarus :
Code: Python  [Select][+][-]
  1. import sys, fitz
  2. fname = 'd:/temp/sample.pdf'  # get document filename
  3. doc = fitz.open(fname)  # open document
  4. for page in doc:  # iterate the document pages
  5.     print('==   Text  ===')
  6.     text = page.get_text("text")
  7.     print(text)
  8.     print('==   HTML  ===')
  9.     html = page.get_text("html")
  10.     print(html)
  11.  
python print is redirected in a Tmemo.

Result in attachment.

Friendly, J.P
Title: Re: How to search for value in pdf?
Post by: loaded on January 28, 2022, 01:35:36 pm
Thank you very much, Jurassic Pork, for taking the time to reply.
Another research topic (one starts before another ends) has emerged for me.
I will consider your solution.
In the meantime, I did not sit idle and in my research;
I learned that the data in the pdf is encoded as FlateDecode. I'll do some more research, it sounds like it's solvable.

Thank you very much Jurassic Pork and winni, your suggestions made me have an idea about not reinventing the wheel.
I solved my problem with ghostscript.
By the way, ghostscript can easily split, merge and rotate pdf files.Respects.


Title: Re: [Solved] How to search for value in pdf?
Post by: paweld on January 28, 2022, 03:00:54 pm
You can also use PDFium - example attached. Download libraries from: https://github.com/pvginkel/PdfiumViewer/tree/releases/2.12.0.0/Libraries/Pdfium
Title: Re: [Solved] How to search for value in pdf?
Post by: loaded on January 28, 2022, 04:42:10 pm
Dear paweld, thank you very much for the reply.
Yes, I will try your suggestion at a convenient time.
Title: Re: [Solved] How to search for value in pdf?
Post by: pcurtis on January 28, 2022, 05:54:07 pm
@paweld Perfect

Adobe / Foxit / ... can kiss my shinny metal ...
7Mb reader not 500Mb
Title: Re: [Solved] How to search for value in pdf?
Post by: alaa123456789 on February 15, 2022, 06:09:08 pm
this pdfium viwer not written in lazarus , we need a sample in lazarus if possible

thanks
Title: Re: [Solved] How to search for value in pdf?
Post by: pcurtis on February 15, 2022, 06:50:35 pm
paweld supplied a sample project
Title: Re: [Solved] How to search for value in pdf?
Post by: alaa123456789 on February 15, 2022, 07:12:12 pm
Well done , thank you  :) :) :)
Title: Re: [Solved] How to search for value in pdf?
Post by: ginoo on January 09, 2024, 11:08:18 am
Quote from: paweld on January 28, 2022, 03:00:54 pm
You can also use PDFium - example attached. Download libraries from: https://github.com/pvginkel/PdfiumViewer/tree/releases/2.12.0.0/Libraries/Pdfium

Hello,
do you also happen to have an example that works on linux?
Title: Re: [Solved] How to search for value in pdf?
Post by: paweld on January 10, 2024, 07:52:56 am
@ginoo: unfortunately no
Title: Re: [Solved] How to search for value in pdf?
Post by: madref on January 10, 2024, 10:58:53 am
Read this post (https://forum.lazarus.freepascal.org/index.php/topic,61206.0.html) and see if it can help you.

Title: Re: [Solved] How to search for value in pdf?
Post by: ginoo on January 10, 2024, 06:05:26 pm
Quote from: madref on January 10, 2024, 10:58:53 am
Read this post (https://forum.lazarus.freepascal.org/index.php/topic,61206.0.html) and see if it can help you.

Thank you for responding. I took a look but I don't think that's what I need. I wanted to be able to put text into an existing pdf. I had also tried "pdfvectorialreader" but I can't even compile it.
Title: Re: [Solved] How to search for value in pdf?
Post by: loaded on January 10, 2024, 07:04:05 pm
Quote from: ginoo on January 10, 2024, 06:05:26 pm
Thank you for responding. I took a look but I don't think that's what I need. I wanted to be able to put text into an existing pdf. I had also tried "pdfvectorialreader" but I can't even compile it.

If you want to add text to the beginning or end of the pdf, you can try ghostscript scripts. But if you want to change the text in the content of the pdf, I don't know.

https://forum.lazarus.freepascal.org/index.php/topic,65199.msg496587.html#msg496587 (https://forum.lazarus.freepascal.org/index.php/topic,65199.msg496587.html#msg496587)
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