OT: Pdf info

OT: Pdf info

[Procházka Lukáš Ing. - Pontex s. r. o.]

Hello,

this question in not straightly related to Context, but Context users may have solved it and Ctx may be used to solve it.

I would need to get the following information from .pdf file(s):

- number of pages,
- common width and height of pages (provided that they are the same; otherwise the dimension can be e.g. zero).

The final goal is to use Ctx as a .pdf joining engine - to provide this, I need to know whether the .pdf to be inserted is portrait or landscape oriented, what is its size (so if to be scaled or not) etc.

So Lua inside Ctx may be used to get the required .pdf info, if necessary.

If an external program was used, it should be non-interactive (command-line oriented), free and working under Windows.

Does anyone have any experience with such a task?

Kind regards,

Lukas


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
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147 14 Praha 4

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Re: OT: Pdf info

[Taco Hoekwater]

On 07/20/11 13:21, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
> Hello,
> 
> this question in not straightly related to Context, but Context users
> may have solved it and Ctx may be used to solve it.
> 
> I would need to get the following information from .pdf file(s):
> 
> - number of pages,
> - common width and height of pages (provided that they are the same;
> otherwise the dimension can be e.g. zero).

There is the macro \getfiguredimensions which, amongst other things,
sets up \noffigurepages, \figurewidth, and \figureheight.

Here is an excerpt from a macro I have been using since 'forever':

\newcount\imgcount % to store the number of pages

\unexpanded\def\addimage#1{%
  \getfiguredimensions[#1.pdf]%
  \imgcount=\noffigurepages\relax
  \dorecurse
      {\the\imgcount}
      {\getfiguredimensions[#1.pdf][page=\recurselevel]%
       \ifdim\figurewidth>\figureheight
          ...
       \fi }}

Best wishes,
Taco
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Re: OT: Pdf info

[luigi scarso]

2011/7/20 Procházka Lukáš Ing. - Pontex s. r. o. <LPr@pontex.cz>:
> Hello,
>
> this question in not straightly related to Context, but Context users may
> have solved it and Ctx may be used to solve it.
>
> I would need to get the following information from .pdf file(s):
>
> - number of pages,
> - common width and height of pages (provided that they are the same;
> otherwise the dimension can be e.g. zero).
>
> The final goal is to use Ctx as a .pdf joining engine - to provide this, I
> need to know whether the .pdf to be inserted is portrait or landscape
> oriented, what is its size (so if to be scaled or not) etc.
>
> So Lua inside Ctx may be used to get the required .pdf info, if necessary.
>
> If an external program was used, it should be non-interactive (command-line
> oriented), free and working under Windows.
>
> Does anyone have any experience with such a task?
You can use some macros (see Taco), and for external programs
google for  mupdf and  xpdf

Tthe lua pdf library with mkiv should be also useful, but I've still
to play with it.


-- 
luigi
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Re: OT: Pdf info

[Hartmut Henkel]

> 2011/7/20 Procházka Lukáš Ing. - Pontex s. r. o. <LPr@pontex.cz>:
> > Hello,
> >
> > this question in not straightly related to Context, but Context users
> may
> > have solved it and Ctx may be used to solve it.
> >
> > I would need to get the following information from .pdf file(s):
> >
> > - number of pages,
> > - common width and height of pages (provided that they are the same;
> > otherwise the dimension can be e.g. zero).
> >
> > The final goal is to use Ctx as a .pdf joining engine - to provide this,
> I
> > need to know whether the .pdf to be inserted is portrait or landscape
> > oriented, what is its size (so if to be scaled or not) etc.
> >
> > So Lua inside Ctx may be used to get the required .pdf info, if
> necessary.
> >
> > If an external program was used, it should be non-interactive
> (command-line
> > oriented), free and working under Windows.
> >
> > Does anyone have any experience with such a task?
> You can use some macros (see Taco), and for external programs
> google for  mupdf and  xpdf
> 
> Tthe lua pdf library with mkiv should be also useful, but I've still
> to play with it.

luatex's epdf library (= poppler Lua bindings, maybe that's what Luigi meant) allows to extract all this info from a pdf file, with a bit of Lua programming.

Regards, Hartmut
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Re: OT: Pdf info

[luigi scarso]

On Wed, Jul 20, 2011 at 2:02 PM, Hartmut Henkel <hartmut_henkel@gmx.de> wrote:
> luatex's epdf library (= poppler Lua bindings, maybe that's what Luigi meant) allows to extract all this info from a pdf file, with a bit of Lua programming.
Yes, I meant the epdf library.


-- 
luigi
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Re: OT: Pdf info

[Procházka Lukáš Ing. - Pontex s. r. o.]

On Wed, 20 Jul 2011 14:02:00 +0200, Hartmut Henkel <hartmut_henkel@gmx.de> wrote:

>> The lua pdf library with mkiv should be also useful, but I've still
>> to play with it.
>
> luatex's epdf library (= poppler Lua bindings, maybe that's what Luigi meant) allows to extract all this info from a pdf file, with a bit of Lua programming.
>
> Regards, Hartmut

Hello,

would you provide a minimal example - if it is possible in the Ctx or Lua scope? Something like:

----
\startluacode
   local info = SOMETHING.getInfo("File.pdf")

   local n = info.numPages
   local w = info.width
   local h = info.height
\stopluacode
----

Best regards,

Lukas

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Re: OT: Pdf info

[Hans Hagen]

On 20-7-2011 2:02, Hartmut Henkel wrote:
>> 2011/7/20 Procházka Lukáš Ing. - Pontex s. r. o.<LPr@pontex.cz>:
>>> Hello,
>>>
>>> this question in not straightly related to Context, but Context users
>> may
>>> have solved it and Ctx may be used to solve it.
>>>
>>> I would need to get the following information from .pdf file(s):
>>>
>>> - number of pages,
>>> - common width and height of pages (provided that they are the same;
>>> otherwise the dimension can be e.g. zero).
>>>
>>> The final goal is to use Ctx as a .pdf joining engine - to provide this,
>> I
>>> need to know whether the .pdf to be inserted is portrait or landscape
>>> oriented, what is its size (so if to be scaled or not) etc.
>>>
>>> So Lua inside Ctx may be used to get the required .pdf info, if
>> necessary.
>>>
>>> If an external program was used, it should be non-interactive
>> (command-line
>>> oriented), free and working under Windows.
>>>
>>> Does anyone have any experience with such a task?
>> You can use some macros (see Taco), and for external programs
>> google for  mupdf and  xpdf
>>
>> Tthe lua pdf library with mkiv should be also useful, but I've still
>> to play with it.
>
> luatex's epdf library (= poppler Lua bindings, maybe that's what Luigi meant) allows to extract all this info from a pdf file, with a bit of Lua programming.

indeed (although we still need to fill in some gaps)

anyhow:

local MyDocument = lpdf.epdf.load("sometext.pdf")

context.starttext()

local pages    = MyDocument.pages
local dummy    = MyDocument.pages[1] -- we need lua 5.2 in order to 
avoid this

local nofpages = #MyDocument.pages

context.starttabulate { "|c|c|c|" }

context.NC() context("page")
context.NC() context("width")
context.NC() context("height") context.NR()

for i=1, nofpages do
     local page = pages[i]
     local bbox = page.CropBox or page.MediaBox
     context.NC() context(i)
     context.NC() context(bbox[4]-bbox[2])
     context.NC() context(bbox[3]-bbox[1]) context.NR()
end

context.stoptabulate()

context.stoptext()



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Re: OT: Pdf info (solved)

[Procházka Lukáš Ing. - Pontex s. r. o.]

Hello,

On Wed, 20 Jul 2011 13:29:35 +0200, luigi scarso <luigi.scarso@gmail.com> wrote:

> You can use some macros (see Taco), and for external programs
> google for  mupdf and  xpdf

I installed "Xpdf for Windows" - http://gnuwin32.sourceforge.net/packages/xpdf.htm - and "pdfinfo.exe" does the job:

----
C:\Programs.Con\Gnu4Win\XPdf\bin>pdfinfo c:\Lukas\Jobs\Drachov.PDPS\SO_126\Texts\TZ#.pdf
Creator:        pdftk 1.41 - www.pdftk.com
Producer:       itext-paulo-155 (itextpdf.sf.net-lowagie.com)
CreationDate:   05/18/11 17:15:13
ModDate:        05/18/11 17:15:13
Tagged:         no
Pages:          8
Encrypted:      no
Page size:      595 x 842 pts (A4)
File size:      119898 bytes
Optimized:      no
PDF version:    1.4
----

Thanks all for their help.

Best regards,

Lukas


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: OT: Pdf info

[Procházka Lukáš Ing. - Pontex s. r. o.]

> local MyDocument = lpdf.epdf.load("sometext.pdf")
>
> context.starttext()
>
> local pages    = MyDocument.pages
> local dummy    = MyDocument.pages[1] -- we need lua 5.2 in order to
> avoid this
>
> local nofpages = #MyDocument.pages
>
> context.starttabulate { "|c|c|c|" }
>
> context.NC() context("page")
> context.NC() context("width")
> context.NC() context("height") context.NR()
>
> for i=1, nofpages do
>      local page = pages[i]
>      local bbox = page.CropBox or page.MediaBox
>      context.NC() context(i)
>      context.NC() context(bbox[4]-bbox[2])
>      context.NC() context(bbox[3]-bbox[1]) context.NR()
> end
>
> context.stoptabulate()
>
> context.stoptext()

This code works perfectly, thank you Hans!

Best regards,

Lukas

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