author | Lennard de Rijk <ljvderijk@gmail.com> |
Mon, 13 Jul 2009 00:53:42 +0200 | |
changeset 2616 | 9321e100a7fb |
parent 109 | 620f9b141567 |
permissions | -rw-r--r-- |
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=========================== |
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Outputting PDFs with Django |
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=========================== |
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This document explains how to output PDF files dynamically using Django views. |
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This is made possible by the excellent, open-source ReportLab_ Python PDF |
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library. |
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The advantage of generating PDF files dynamically is that you can create |
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customized PDFs for different purposes -- say, for different users or different |
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pieces of content. |
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For example, Django was used at kusports.com_ to generate customized, |
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printer-friendly NCAA tournament brackets, as PDF files, for people |
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participating in a March Madness contest. |
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.. _ReportLab: http://www.reportlab.org/rl_toolkit.html |
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.. _kusports.com: http://www.kusports.com/ |
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Install ReportLab |
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================= |
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Download and install the ReportLab library from http://www.reportlab.org/downloads.html. |
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The `user guide`_ (not coincidentally, a PDF file) explains how to install it. |
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Test your installation by importing it in the Python interactive interpreter:: |
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>>> import reportlab |
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If that command doesn't raise any errors, the installation worked. |
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.. _user guide: http://www.reportlab.com/docs/userguide.pdf |
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Write your view |
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=============== |
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The key to generating PDFs dynamically with Django is that the ReportLab API |
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acts on file-like objects, and Django's ``HttpResponse`` objects are file-like |
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objects. |
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.. admonition:: Note |
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For more information on ``HttpResponse`` objects, see |
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`Request and response objects`_. |
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.. _Request and response objects: ../request_response/ |
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Here's a "Hello World" example:: |
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from reportlab.pdfgen import canvas |
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from django.http import HttpResponse |
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def some_view(request): |
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# Create the HttpResponse object with the appropriate PDF headers. |
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response = HttpResponse(mimetype='application/pdf') |
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response['Content-Disposition'] = 'attachment; filename=somefilename.pdf' |
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# Create the PDF object, using the response object as its "file." |
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p = canvas.Canvas(response) |
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# Draw things on the PDF. Here's where the PDF generation happens. |
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# See the ReportLab documentation for the full list of functionality. |
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p.drawString(100, 100, "Hello world.") |
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# Close the PDF object cleanly, and we're done. |
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p.showPage() |
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p.save() |
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return response |
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The code and comments should be self-explanatory, but a few things deserve a |
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mention: |
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* The response gets a special mimetype, ``application/pdf``. This tells |
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browsers that the document is a PDF file, rather than an HTML file. If |
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you leave this off, browsers will probably interpret the output as HTML, |
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which would result in ugly, scary gobbledygook in the browser window. |
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* The response gets an additional ``Content-Disposition`` header, which |
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contains the name of the PDF file. This filename is arbitrary: Call it |
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whatever you want. It'll be used by browsers in the "Save as..." |
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dialogue, etc. |
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* The ``Content-Disposition`` header starts with ``'attachment; '`` in this |
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example. This forces Web browsers to pop-up a dialog box |
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prompting/confirming how to handle the document even if a default is set |
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on the machine. If you leave off ``'attachment;'``, browsers will handle |
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the PDF using whatever program/plugin they've been configured to use for |
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PDFs. Here's what that code would look like:: |
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response['Content-Disposition'] = 'filename=somefilename.pdf' |
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* Hooking into the ReportLab API is easy: Just pass ``response`` as the |
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first argument to ``canvas.Canvas``. The ``Canvas`` class expects a |
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file-like object, and ``HttpResponse`` objects fit the bill. |
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* Note that all subsequent PDF-generation methods are called on the PDF |
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object (in this case, ``p``) -- not on ``response``. |
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* Finally, it's important to call ``showPage()`` and ``save()`` on the PDF |
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file. |
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Complex PDFs |
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============ |
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If you're creating a complex PDF document with ReportLab, consider using the |
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cStringIO_ library as a temporary holding place for your PDF file. The |
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cStringIO library provides a file-like object interface that is particularly |
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efficient. Here's the above "Hello World" example rewritten to use |
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``cStringIO``:: |
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from cStringIO import StringIO |
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from reportlab.pdfgen import canvas |
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from django.http import HttpResponse |
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def some_view(request): |
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# Create the HttpResponse object with the appropriate PDF headers. |
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response = HttpResponse(mimetype='application/pdf') |
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response['Content-Disposition'] = 'attachment; filename=somefilename.pdf' |
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buffer = StringIO() |
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# Create the PDF object, using the StringIO object as its "file." |
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p = canvas.Canvas(buffer) |
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# Draw things on the PDF. Here's where the PDF generation happens. |
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# See the ReportLab documentation for the full list of functionality. |
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p.drawString(100, 100, "Hello world.") |
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# Close the PDF object cleanly. |
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p.showPage() |
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p.save() |
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# Get the value of the StringIO buffer and write it to the response. |
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pdf = buffer.getvalue() |
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buffer.close() |
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response.write(pdf) |
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return response |
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.. _cStringIO: http://www.python.org/doc/current/lib/module-cStringIO.html |
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Further resources |
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================= |
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* PDFlib_ is another PDF-generation library that has Python bindings. To |
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use it with Django, just use the same concepts explained in this article. |
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* HTMLdoc_ is a command-line script that can convert HTML to PDF. It |
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doesn't have a Python interface, but you can escape out to the shell |
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using ``system`` or ``popen`` and retrieve the output in Python. |
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* `forge_fdf in Python`_ is a library that fills in PDF forms. |
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.. _PDFlib: http://www.pdflib.org/ |
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.. _HTMLdoc: http://www.htmldoc.org/ |
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.. _forge_fdf in Python: http://www.accesspdf.com/article.php/20050421092951834 |