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QGIS Python Programming Cookbook

You're reading from   QGIS Python Programming Cookbook Over 140 recipes to help you turn QGIS from a desktop GIS tool into a powerful automated geospatial framework

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Product type Paperback
Published in Mar 2015
Publisher
ISBN-13 9781783984985
Length 340 pages
Edition 1st Edition
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Author (1):
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Joel Lawhead Joel Lawhead
Author Profile Icon Joel Lawhead
Joel Lawhead
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Toc

Table of Contents (11) Chapters Close

Preface 1. Automating QGIS FREE CHAPTER 2. Querying Vector Data 3. Editing Vector Data 4. Using Raster Data 5. Creating Dynamic Maps 6. Composing Static Maps 7. Interacting with the User 8. QGIS Workflows 9. Other Tips and Tricks Index

Accessing the script path from within your script

Sometimes, you need to know exactly where the current working directory is so that you can access external resources.

Getting ready

This code uses the Python built-in library and can be used in any context. We will run this recipe in the QGIS Python console.

How to do it…

In this recipe, we will get the current working directory of the Python console, which can change with configuration:

  1. Start QGIS.
  2. From the Plugins menu, select Python Console.
  3. In the Python console, run the following code:
    import os
    os.getcwd()

How it works…

QGIS relies heavily on file system paths to run the application and to manage external data. When writing cross-platform QGIS code, you cannot assume the working directory of your script.

There's more…

On his blog, one of the QGIS developers has an excellent post about the various aspects of path variables in QGIS beyond just the execution directory; you can check it out at http://spatialgalaxy.net/2013/11/06/getting-paths-with-pyqgis/.

You have been reading a chapter from
QGIS Python Programming Cookbook
Published in: Mar 2015
Publisher:
ISBN-13: 9781783984985
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