I am developing the RQGIS package. To run QGIS from within R, I call QGIS via the command line. This worked perfectly with QGIS 2.14. Running the same code with QGIS 2.16, however, produces an error. Here is what I do:
First, I set all necessary paths in the command prompt:
@echo off
SET OSGEO4W_ROOT=D:\osgeo4w_qgis16
call "%OSGEO4W_ROOT%"\bin\o4w_env.bat
@echo off
path %PATH%;%OSGEO4W_ROOT%\apps\qgis\bin
set PYTHONPATH=%PYTHONPATH%;%OSGEO4W_ROOT%\apps\qgis\python;
set QGIS_PREFIX_PATH=%OSGEO4W_ROOT%\apps\qgis
rem open python
python.exe
Subsequently, I run following lines in Python:
import os
import sys
from qgis.core import *
import qgis.utils
from osgeo import ogr
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.gui import *
QgsApplication.setPrefixPath('D:\osgeo4w_qgis16\apps\qgis', True)
app = QgsApplication([], True)
QgsApplication.initQgis()
sys.path.append(r'D:\osgeo4w_qgis16\apps\qgis\python\plugins')
from processing.core.Processing import Processing
Processing.initialize()
import processing
processing.alglist()
processing.alghelp("grass7:v.voronoi")
This works. However, calling processing.runalg...
from processing.tests.TestData import points
result = processing.runalg('grass7:v.voronoi', points(), False, False, '270778.60198,270855.745301,4458921.97814,4458983.8488', -1, 0.0001, 0, None,)
...produces this error message:
Error in sys.excepthook:
Traceback (most recent call last):
File "D:\osgeo4w_qgis16\apps\qgis\python\qgis\utils.py", line 196, in qgis_excepthook
showException(type, value, tb, None, messagebar=True)
File "D:\osgeo4w_qgis16\apps\qgis\python\qgis\utils.py", line 107, in showException
open_stack_dialog(type, value, tb, msg)
File "D:\osgeo4w_qgis16\apps\qgis\python\qgis\utils.py", line 142, in open_stack_dialog
iface.messageBar().popWidget()
AttributeError: 'NoneType' object has no attribute 'messageBar'
Original exception was:
Traceback (most recent call last):
File "<stdin>", line 10, in <module>
File "D:\osgeo4w_qgis16\apps\qgis\python\plugins\processing\tools\general.py", line 75, in runalg
alg = Processing.runAlgorithm(algOrName, None, *args, **kwargs)
File "D:\osgeo4w_qgis16\apps\qgis\python\plugins\processing\core\Processing.py", line 304, in runAlgorithm
ret = runalg(alg, progress)
File "D:\osgeo4w_qgis16\apps\qgis\python\plugins\processing\gui\AlgorithmExecutor.py", line 52, in runalg
progress.error(e.msg)
AttributeError: 'NoneType' object has no attribute 'error'
I would greatly appreciate if anybody could tell me, how to fix this!!
