Feature request #4920

Add python actions examples to documentation

Added by Giovanni Manghi over 8 years ago. Updated about 8 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Documentation and Help
Pull Request or Patch supplied:Yes Resolution:fixed
Easy fix?:No Copied to github as #:14726

Description

I have two good examples of python actions that I believe are good to be included in the Manual.

The first two are about opening files with external programs: usually
you have to use absolute paths, or relative paths... relative to the
position of the external program executable.

What about if you need to use relative paths relative to the selected
layer (file based)?

command = "eog"; imagerelpath = "immagini/tav_01.jpg"; layer =
qgis.utils.iface.activeLayer(); import os.path; layerpath =
layer.source() if layer.providerType() 'ogr' else
(qgis.core.QgsDataSourceURI(layer.source()).database() if
layer.providerType() 'spatialite' else None); path =
os.path.dirname(str(layerpath)); image = os.path.join(path,
imagerelpath); import subprocess; subprocess.Popen( [command, image ] );

and what about if the relative path need to be relative to the (saved)
project file?

command = "eog"; imagerelpath = "immagini/tav_01.jpg"; projectpath =
qgis.core.QgsProject.instance().fileName(); import os.path; path =
os.path.dirname(str(projectpath)) if projectpath != '' else None; image = os.path.join(path, imagerelpath); import subprocess;
subprocess.Popen( [command, image ] );

He also suggested me a way to add new layers to a project trough an
action:

qgis.utils.iface.addVectorLayer('/home/user/%column_name.shp','%
NAME', 'ogr')

qgis.utils.iface.addRasterLayer('/home/user/%column_name.tif','%NAME')

working_with_vector_patch.diff Magnifier (2.75 KB) Giovanni Manghi, 2012-08-12 02:45 PM

History

#1 Updated by Giovanni Manghi about 8 years ago

#2 Updated by Giovanni Manghi about 8 years ago

  • Tracker changed from Bug report to Feature request

#3 Updated by Giovanni Manghi about 8 years ago

  • Resolution set to fixed
  • Status changed from Open to Closed

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