Good question, Leonard.
If someone were to attempt to use the approach I recommended to extract text
from a locked and encrypted PDF, rather than from the PS print file, he/she
would be doomed to failure, as the regex engine that would be used in the
match/substitution would be unable to find the target text fragments.
The context of the OP's question suggested he was trying to read text content
from a PDF with a program. Naturally, the procedure I recommended requires the
user to be able to open the PDF with Reader and print it to a PS file.
I don't understand your question about "read it to just read it" in the context
of the OP's question. I think we're talking about text extraction. Please
rephrase your question.
BTW, this issue was thoroughly discussed on comp.text.pdf about 4-5 years ago.
Cheers,
Bill Segraves
----- Original Message -----
From: Leonard Rosenthol
To: Post all your questions about iText here
Sent: Sunday, October 07, 2007 6:57 PM
Subject: Re: [iText-questions] u guys konw how to read the data from pdfusing
java itext ?
Why would using this approach fail on a PDF that is locked with a
password? In order to print the PDF, you have to have the ability to
READ it ;). And if you can read it in order to print it, you can
read it to just read it...Right?
Leonard
On Oct 7, 2007, at 11:05 AM, [EMAIL PROTECTED] wrote:
> If the PDF is locked with a password, but still printable, the
> approach offered by this author is one that would work, while
> attempting to use this approach on the original PDF would fail.
> This author was simply trying to help the poster with an approach
> that would avoid the frustration that would ensue if he tried to
> work with an original locked PDF.
>
>
> Of course, the approach espoused by the esteemed sage would be
> easier, for both unlocked and unlocked PDFs. OTOH, this author
> doesn't count easier to fail as an acceptable approach.
>
>
> Cheers,
>
> Bill Segraves
>
> -------------- Original message from Leonard Rosenthol
> <[EMAIL PROTECTED]>: --------------
>
>
> > Why would working through the PostScript be easier than doing
> this on
> > the original PDF?
> >
> > You can get to all the PDF operators just fine.
> > Font & text information is more easily referenceable from the PDF
> > PostScript also has "XObjects", Patterns, etc. that may contain
> text.
> > etc.
> >
> > Not understanding the logic :(.
> >
> > Leonard
> >
> >
> > On Oct 6, 2007, at 4:53 PM, [EMAIL PROTECTED] wrote:
> >
> > > Yes; but it is not practicable with iText. You could, however, as
> > > long as the PDF is printable, use the following procedure:
> > >
> > > 1. Print to a PS file.
> > >
> > > 2. Scan the PS file from step1 above, droppin g all lines that
> > > do not end with Tj or TJ.
> > >
> > > 3. Use a regular expression (together with Substitution or
> > > Match) to extract the instances of "text fragment" from within
> > > multiple instances of "(text fragment)Tj", printing the resulting
> > > text fragments to STDOUT.
> > >
> > > Bruno has given an excellent example of why you should not expect
> > > the resulting output to make sense, i.e., the text fragments may
> > > not appear in the order in which you'd like for them to appear.
> > >
> > > Cheers,
> > >
> > > Bill Segraves
> > >
> > > -------------- Original message from krammark
> > > : --------------
> > >
> > >
> > > >
> > > > so , how we read the data from pdf ?
> > > > i mean , can we read them line by line from the specific pages ?
> > & gt; &g t;
> > > > thanks buddy.
> > > >
> > > >
> > > > Bruno Lowagie (iText) wrote:
> > > > >
> > > > > krammark wrote:
> > > > >> hey gusy,
> > > > >> do u guys have a idea how to read the data from pdf pages
> > > using itext ?
> > > > >> basically, i want to read the data from table and write them
> > > into excel
> > > > >> files.
> > > > >> is that possible ?
> > > > >
> > > > > There is no such thing as 'a table' in plain PDF.
> > > > > It's just lines and words painted on a canvas,
> > > > > possible in an arbitrary order.
> > > > >
> > > > > Unless your tables cells are form fields, or your
> > > > ; > PDF contains specific table structures (Tagged PDF),
> > > > > iText probably won't help you.
> & gt; > > >
> > > > > br,
> > > > > Bruno
> > > > >
> > > > >
> > >
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> > > > --
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> > > > http://www.nabble.com/u-guys-konw -how-t o-read-the-data-from-
> pdf-
> > > using-java-itext
> > > > ---tf4572506.html#a13067937
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