Xhtml2pdf is a cross-platform Python module that allows easy conversion of HTML or XML to PDF files. Its dependencies, ReportLab & Pisa, also have a host of very useful functions, including programmatically creating or modifying PDF content & creating barcodes.
Of particular interest to us here at Beezwax is using it to work around the lack of PDF generation functions when running server-side FileMaker scripts. But the steps below should be useful for even non-FileMaker folks who wanted to use xhtml2pdf on their system. The install instructions are not hard, but due to a few minor complications, definitely not obvious to someone unfamiliar with Python’s package management tools.
But before we can have any fun using this, we’ll need to get it installed for us to use. Below I’ll go through installation steps, which I’ve tested on Mac OS Yosemite and Mac OS El Capitan.
1 – Install XCode command line tools
An easy way to install this is to open the Terminal and run gcc . If the command line tools are not present, you will be prompted with a dialog and options to either install the full XCode tools, or just click Install for the command line tools only.
2 – Install Pip
This is a Python package manager that supplements easy_install. Newer Python installs include Pip by default, but not Apple’s version included with OS X. In particular, Pip knows how to build libjpeg, a required library. Without Pip we’d have to build this separately or fiddle with some paths in obscure xhtml2pdf files.
We use easy_install to bootstrap our pip based installs. Installation is simply
sudo easy_install pip
3 – Install xhtml2pdf
On Yosemite, this installs easily:
sudo pip install xhtml2pdf
On El Capitan, its new file system restrictions complicate the install, so we must install into a specified folder:
sudo mkdir -p /opt/Python/2.7/ sudo pip install --target=/opt/Python/2.7/ xhtml2pdf
4 – Let’s Test
First, startup Python in the Terminal.
For El Capitan, we’ll have to tell Python about our custom path:
import sys sys.path.append ("/opt/Python/2.7/")
Now paste in the following code. It should create the .pdf file and open it in Preview.
import xhtml2pdf # def convertHtmlToPdf(sourceHtml, outputFilename): resultFile = open(outputFilename, "w+b") pisaStatus = pisa.CreatePDF( sourceHtml, # the HTML to convert dest=resultFile) # file handle to recieve result resultFile.close() return pisaStatus.err # sourceHtml = "<html><body><p>To PDF or not to PDF<p></body></html>" outputFilename = "test.pdf" # pisa.showLogging() convertHtmlToPdf(sourceHtml, outputFilename) pisa.startViewer(outputFilename)
Now that we have it installed, in a later post I’ll discuss how to use it with server-side scripts in FileMaker.
A good starting point for finding out more about xhtml2pdf and Pisa is here: https://github.com/xhtml2pdf/xhtml2pdf/blob/master/doc/usage.rst
For ReportLab the main documentation site is http://reportlab.com/documentation/