Hi!

How to extract a table (or tables, if there are several) from PDF file. 

I looked at the functions on your site, and also looked for examples for extracting tables, 

but did not find anything like it.

An example of use would be desirable on Delphi, if possible, 

but it is possible on Sharpe too. 

Thanks in advance!

Each extracted table would have to be a text block in the form of a list of rows, where each row of the list is a row of the table, and the fields in these rows should be separated by a separator, for example, <TAB>.

Thanks for such a quick reply!

Your answer involves analyzing tables in the more general complex case where the code for these tables can be drawn arbitrarily. And then indeed, the cells of these tables must be calculated in a poorly formalized non-trivial way.

I consider a simpler case when the source file with standard tables is created, for example, in MS Word or OpenOffice, then it is either saved as a PDF file or printed on a virtual PDF printer, generating the same PDF file in which the structure from the original tables are stored.

Now, if you send such a PDF file to convert PDF2Word to any of the many free web services and get the “.docx” document, then the whole structure of the source tables will be completely saved in this resulting file, and they can be easily extracted from this document .

I am attaching an archive https://yadi.sk/d/nHjE9l9Xkh8HNg" rel="nofollow -

You in vain saw the irony in my previous post!

I really sincerely thanked you for your prompt reply!

Regarding the substance of the issue under discussion:

It could be a false impression that the method for extracting the tables discussed above applies exclusively to tables created in MSWord or OpenOffice documents sent to a virtual PDF printer.

However, if you create a PDF file with a table directly, exclusively using CreateTable () in DebenuPDFLibrary, as, for example, in the  http://www.quickpdf.org/forum/create-table-exactly-like-this-sample_topic1907.html" rel="nofollow - http://www.quickpdf.org/forum/create-table-exactly-like-this-sample_topic1907.html , it is also easy to extract this table from it using the same technology:

1. Send the created file (table.pdf) from this demo to a web service, for example,  https://www.pdf2go.com/pdf-to-word" rel="nofollow - https://www.pdf2go.com/pdf-to-word  and get the MS Word document back.

Obviously, DebenuPDFLibrary lacks the reverse functionality to CreateTable () - ExtractTable () or something like that!

Since the test file table.pdf created directly does not store any data about the table as an independent object (as inside .docx: in document.xml, where each table is really a separate table with the <w:tbl> tag), it’s easy to see , looking at its contents in any text viewer (both table.pdf and document.xml), the question arose - what will happen when extracting the tables when there are several of them in the pdf-file and they are partially overlapped?

To clarify this issue, we will conduct the following experiment: make small changes to the program - after the original string:

    QP.DrawTableRows (tableID, 50, 50, 400, 1, 0);

insert the lines:

    QP.DrawTableRows (TableID, 70, 210, 400, 1, 0); // 2-nd table shift <right / down>

    QP.DrawTableRows (TableID, 30, 300, 400, 1, 0); // 3-rd table shift <left / up> - partially overlaps 2-nd table

If you comment out the last row, we will have 2 tables and they will be successfully recognized and extracted from the pdf-file, despite the fact that the 2nd table is partially shifted horizontally and vertically relative to the first.

However, if we uncomment the third row, the third table partially overlaps the second table, and after recognizing and extracting them, we get an amazing picture: the first table is successfully recognized and can be extracted, but the second and third tables are glued into one complex composite table! 

This fully confirmed our assumption when examining the contents of a pdf file that it does not store any data about the table as an independent object and the pdf2word-algorithm actually performs non-trivial canvas calculations to recognize the table.

PS: Excuse me for my google-translate english 

Using this kind of code:

I Get:

Question:

How to decode stream using QuickPDF Library ?

and now ..... I see that there are in this test.pdf      Tj as a glyph not a simple text.