Tuesday, November 25, 2008

PdfPoster - a simple fix for Windows

I have tried a couple of times over the last 3 months to use PdfPoster on some Erwin documents. Unfortunately, I am using Windows XP on my work PC. It was clearly documented that I needed to install PyPdf 1.11 or higher, so I did easy_setup to install 1.12. Recently, I tried "C:\test>pdfposter -vvv -s 2.0 SCHEDULING.pdf scheduling_2x.pdf" ... and received a nice traceback (see below). This led me on a wild goose chase, under the assumption that my PyPDF library was not installed correctly. After a while, I decided to start python in immediate mode and just exercise PyPdf. It worked fine, but I noticed that the example opened a file using "rb" mode (read only, binary). So, I opened pdfposter/__init__.py under my site library directory, scrolled down to the bottom and changed the 3rd line of "def main" from "inpdf = PdfFileReader(open(infilename))" to "inpdf = PdfFileReader(open(infilename, "rb"))". Problem solved! So if you ever have problem with a python application, where it works under Linux but not under WinXP, try opening files in binary mode.

Mediasize : 1x1 a4
595.00 842.00 dots
Postersize: 1x1 a4
595.00 842.00 dots
---- processing page 1 -----
input dimensions: 612.00 792.00 (trimbox of input page)
output dimensions: 595.00 842.00 (poster size)
Calculated page scaling factor: 0.972222
output dimensions: 595.00 770.00 (calculated)
Pages w/o rotation 1 x 1
Pages w/ rotation 1 x 2
Decided for rotation: no
Deciding for 1 columns and 1 rows of portrait pages.
Traceback (most recent call last):
File "C:\Python25\Scripts\pdfposter-script.py", line 8, in
load_entry_point('pdftools.pdfposter==0.4.5', 'console_scripts', 'pdfposter'
File "C:\Python25\lib\site-packages\pdftools\pdfposter\cmd.py", line 119, in r
main(opts, *args)
File "C:\Python25\lib\site-packages\pdftools\pdfposter\__init__.py", line 298,
in main
posterize(outpdf, page, opts.media_size, opts.poster_size, opts.scale)
File "C:\Python25\lib\site-packages\pdftools\pdfposter\__init__.py", line 251,
in posterize
_scale_pdf_page(page, scale)
File "C:\Python25\lib\site-packages\pdftools\pdfposter\__init__.py", line 235,
in _scale_pdf_page
content = ContentStream(page["/Contents"].getObject(), page.pdf)
File "c:\docume~1\rtate\locals~1\temp\easy_install-gpolew\pyPdf-1.12-py2.5-win
32.egg.tmp\pyPdf\pdf.py", line 1114, in __init__
File "c:\docume~1\rtate\locals~1\temp\easy_install-gpolew\pyPdf-1.12-py2.5-win
32.egg.tmp\pyPdf\generic.py", line 165, in getObject
File "c:\docume~1\rtate\locals~1\temp\easy_install-gpolew\pyPdf-1.12-py2.5-win
32.egg.tmp\pyPdf\pdf.py", line 549, in getObject
File "c:\docume~1\rtate\locals~1\temp\easy_install-gpolew\pyPdf-1.12-py2.5-win
32.egg.tmp\pyPdf\generic.py", line 67, in readObject
File "c:\docume~1\rtate\locals~1\temp\easy_install-gpolew\pyPdf-1.12-py2.5-win
32.egg.tmp\pyPdf\generic.py", line 539, in readFromStream
File "c:\docume~1\rtate\locals~1\temp\easy_install-gpolew\pyPdf-1.12-py2.5-win
32.egg.tmp\pyPdf\pdf.py", line 544, in getObject
KeyError: 0

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