Python (pyuno) "Hello World" Addon for OpenOffice
In my last few posts about pyuno (SSConverter, OORunner) we used pyuno to convert spreadsheets to CSV files by running OpenOffice from Python using pyuno as the bridge between the two processes. In this post we're going to get inside OpenOffice and use pyuno as the bridge between OpenOffice and an embedded Python interpreter (embedded inside OpenOffice).
As is the law, our first program when doing something new has to be a "Hello World" program. The idea here is to add an option to the OpenOffice menu which will insert "Hello World" into the first cell of a spreadsheet. As a starting point for this example I used an example from the pyuno udk site (the second "Hello World" example on the page).
The example there does essentially the same thing as the example here except there it inserts "Hello World" into a Writer (Word Processor) document rather than a spreadsheet. One would assume that it would be a fairly easy conversion, and once I knew the answer it was. The hard part was figuring out how to get the "spreadsheet" object and then how to get a "cell" object from it. And it wasn't so much hard as just time consuming trying to find the right information in the documentation.
After a few hours of searching and a few false starts I came across the two needed interfaces: XSpreadsheetDocument and XCell. These gave me what I needed to modify the example to work with a spreadsheet:
1 import uno 2 import unohelper 3 4 from com.sun.star.task import XJobExecutor 5 6 # Implement an UNO component by deriving from the standard 7 # unohelper.Base class and from the interface(s) you want to implement. 8 class HelloWorldJob(unohelper.Base, XJobExecutor): 9 def __init__(self, ctx): 10 # store the component context for later use 11 self.ctx = ctx 12 13 def trigger(self, args): 14 # Retrieve the desktop object 15 desktop = self.ctx.ServiceManager.createInstanceWithContext("com.sun.star.frame.Desktop", self.ctx) 16 17 # Get the spreadsheet. 18 spreadsheet = desktop.getCurrentComponent() 19 20 # Get the collection of sheets in the spreadsheet. 21 sheets = spreadsheet.getSheets() 22 23 # Get the first cell in the first sheet. 24 cell = sheets.getByIndex(0).getCellByPosition(0, 0) 25 26 # Modify its contents. 27 if cell.getFormula(): 28 cell.setFormula("Hello " + cell.getFormula()) 29 else: 30 cell.setFormula("Hello world") 31 32 33 # pythonloader looks for a static g_ImplementationHelper variable 34 g_ImplementationHelper = unohelper.ImplementationHelper() 35 36 g_ImplementationHelper.addImplementation( \ 37 HelloWorldJob, # UNO object class 38 "org.openoffice.comp.pyuno.demo.HelloWorld", # Implementation name 39 ("com.sun.star.task.Job",),) # List of implemented services
The meat of the example is the trigger method of the HelloWorldJob class. This method is called when the add-on is invoked. Trigger performs the following steps:
- It gets the top-level desktop object.
- From the desktop object it gets the current component. The current component in this case is a SpreadsheetDocument.
- From the spreadsheet object it gets the collection of all the sheets in the spreadsheet.
- From the sheets collection it gets the first sheet and then the first Cell from that sheet.
- Using the cell, if the cell is empty it inserts "Hello World". If the sheet contains something then it prefixes the old contents with "Hello ".
The rest of the code is essentially a copy of the code from the original example.
Now that we have the code we need to integrate it into OpenOffice. We do that by creating a zip file of the code and a XML file that describes the add-on. The XML file is, again, essentially just a copy from the original example:
<?xml version="1.0" encoding="UTF-8"?> <oor:node xmlns:oor="http://openoffice.org/2001/registry" xmlns:xs="http://www.w3.org/2001/XMLSchema" oor:name="Addons" oor:package="org.openoffice.Office"> <node oor:name="AddonUI"> <node oor:name="AddonMenu"> <node oor:name="org.openoffice.comp.pyuno.demo.HelloWorld" oor:op="replace"> <prop oor:name="URL" oor:type="xs:string"> <value>service:org.openoffice.comp.pyuno.demo.HelloWorld?insert</value> </prop> <prop oor:name="ImageIdentifier" oor:type="xs:string"> <value>private:image/3216</value> </prop> <prop oor:name="Title" oor:type="xs:string"> <value xml:lang="en-US">Insert Hello World</value> </prop> </node> </node> </node> </oor:node>
In addition to creating the zip file containing these two files you need to run unopkg to register the add-on with OpenOffice. The following bash script does the zipping and the packaging and then runs OpenOffice so that you can test it:
#!/bin/bash unopkg_bin=/usr/bin/unopkg oocalc_bin=/usr/bin/oocalc addons=Addons.xcu python_file=hello_world_oocalc.py zip_file=hello_world.zip rm $zip_file zip $zip_file $addons $python_file $unopkg_bin remove $zip_file $unopkg_bin add $zip_file #export PYUNO_LOGLEVEL=CALL export PYUNO_LOGLEVEL=ARGS export PYUNO_LOGTARGET=stdout $oocalc_bin
When you run the script it will start OpenOffice and you should see the following option in the "Tools" menu:
If you select the option the add-on should modify the spreadsheet and you should now have:
If you select the option again you should get:
Mitch Frazier is an Associate Editor for Linux Journal.
|Contrast Security's Contrast Enterprise||Aug 30, 2016|
|illusive networks' Deceptions Everywhere||Aug 29, 2016|
|Happy Birthday Linux||Aug 25, 2016|
|ContainerCon Vendors Offer Flexible Solutions for Managing All Your New Micro-VMs||Aug 24, 2016|
|Updates from LinuxCon and ContainerCon, Toronto, August 2016||Aug 23, 2016|
|NVMe over Fabrics Support Coming to the Linux 4.8 Kernel||Aug 22, 2016|
- Contrast Security's Contrast Enterprise
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- illusive networks' Deceptions Everywhere
- Happy Birthday Linux
- What I Wish I’d Known When I Was an Embedded Linux Newbie
- New Version of GParted
- Tech Tip: Really Simple HTTP Server with Python
- All about printf
- ContainerCon Vendors Offer Flexible Solutions for Managing All Your New Micro-VMs
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide