[Qgis-developer] processing.runalg() issue with grass algorithms

[Victor Olaya]

The runalg method does not return a layer. It returns a dict with the
outputs of the algorithms. Keys are output names, values are paths to
output objects

Hope this helps

2014-03-25 22:36 GMT+01:00 Eric Goddard <egoddard1010 at gmail.com>:
> Alright, latest master (9e42c5b), with processing version
> 2.0-20131120. Running a custom tool that consists of the following
> code results in an error:
>
> ##dem=raster
> ##radius=number 4
> ##lpf=output raster
>
> lpf = processing.runalg("saga:simplefilter", dem, 0, 0, radius, None)
>
>
> An error has occured while executing Python code:
>
> Traceback (most recent call last):
>   File "/home/eric/.qgis2/python/plugins/processing/gui/AlgorithmExecutionDialog.py",
> line 256, in accept
>     self.finish()
>   File "/home/eric/.qgis2/python/plugins/processing/gui/AlgorithmExecutionDialog.py",
> line 281, in finish
>     Postprocessing.handleAlgorithmResults(self.alg, self, not keepOpen)
>   File "/home/eric/.qgis2/python/plugins/processing/gui/Postprocessing.py",
> line 77, in handleAlgorithmResults
>     dlg = CouldNotLoadResultsDialog(wrongLayers, alg)
>   File "/home/eric/.qgis2/python/plugins/processing/gui/CouldNotLoadResultsDialog.py",
> line 41, in __init__
>     self.setupUi()
>   File "/home/eric/.qgis2/python/plugins/processing/gui/CouldNotLoadResultsDialog.py",
> line 50, in setupUi
>     html = self.alg.getPostProcessingErrorMessage(self.wrongLayers)
>   File "/home/eric/.qgis2/python/plugins/processing/core/GeoAlgorithm.py",
> line 520, in getPostProcessingErrorMessage
>     + layer.value + '\n'
> TypeError: cannot concatenate 'str' and 'dict' objects
>
>
> Python version:
> 2.7.6 (default, Feb 26 2014, 12:07:17)
> [GCC 4.8.2 20140206 (prerelease)]
>
>
> QGIS version:
> 2.3.0-Master Master, 9e42c5b
>
> Python path: ['/home/eric/.qgis2/python/plugins/processing',
> '/usr/share/qgis/python', u'/home/eric/.qgis2/python',
> u'/home/eric/.qgis2/python/plugins', '/usr/share/qgis/python/plugins',
> '/usr/lib/python27.zip', '/usr/lib/python2.7',
> '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk',
> '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload',
> '/usr/lib/python2.7/site-packages',
> '/usr/lib/python2.7/site-packages/gtk-2.0',
> '/usr/lib/python2.7/site-packages/wx-3.0-gtk2',
> '/usr/share/qgis/python/plugins/fTools/tools', '/home/eric/Documents']
>
>
> Running the code in the console completes successfully. However, I'm
> still unable to run a grass algorithm when the grass_region_parameter
> and grass_region_cellsize_parameter are set to None.
>
> Thanks,
> Eric
>
> On Mon, Mar 24, 2014 at 10:13 PM, Eric Goddard <egoddard1010 at gmail.com> wrote:
>> Oops, my mistake. I have ##lrm=output raster in the header, but lpf = ... Is
>> the only line in my code.
>>
>> I don't get the error message after changing lrm to lpf in the header. I do
>> get another error message, but I think I broke my processing by trying to
>> force an update. I'll test it tomorrow. Sorry about the confusion!
>>
>> Eric
>>
>> On Mar 22, 2014 5:06 PM, "Eric Goddard" <egoddard1010 at gmail.com> wrote:
>>>
>>> Ah, I didn't know a file could he specified without a path. Thanks for the
>>> clarification!
>>>
>>> On Mar 22, 2014 4:37 PM, "Victor Olaya" <volayaf at gmail.com> wrote:
>>>>
>>>> > If I run the same line in the python console, it works correctly:
>>>> >>>> radius = 4
>>>> >>>> lpf = processing.runalg("saga:simplefilter", "SR_50M_alaska_nad", 0,
>>>> >>>> 0, radius, None)
>>>> >>>> processing.load(lpf['RESULT'])
>>>> >
>>>> > Results in the map being loaded.
>>>>
>>>> Not sure why this is happening. I will try to reproduce the error and
>>>> see if it can be fixed
>>>> Thanks for the report
>>>>
>>>> >
>>>> > Also, if I change the output folder in the processing settings to a
>>>> > different location (in this case, tmp/processing in my home folder)
>>>> > and run another algorithm in the python console, the RESULT key still
>>>> > points to /tmp/processing/...
>>>>
>>>> This is not a bug. If you do not enter a filename, the output will
>>>> always go to a temporary file. The output folder that yu can set in
>>>> the settings  is the folder to be used when you enter a filename
>>>> without a path (like "myfile.shp", but not "/home/myuser/myfile.shp"),
>>>> not the folder to use for temporary files.
>>>>
>>>> Thanks again!