[Pywps-dev] Import qgis.core into PyWPS process
Jáchym Čepický
jachym.cepicky at gmail.com
Thu Jan 5 05:54:53 PST 2017
Hi,
I'm afraid, I do not know much about QGIS. I have no clue about how it's
processing module is organized.
What about using shapely or fiona for this task?
J
Dne 5.1.2017 v 14:40 Eduardo Silverio da Silva napsal(a):
> Problem solved!
>
> The problem is that each time that I change the PATHs, the Apache need to
> be restarted to update the environment variables.
> Also I realized that only the PYTHONPATH in Windows is not recognized in
> the way that I have done before (Control Panel>Advanced system
> settings>Environment Variables), so I needed to put the paths in a archive
> that my Python could read "C:\Pytho27\paths.pth".
> Now I can import qgis.core and even the plugin "processing" from qgis.
>
> But here is another question: How to run the algorithm Extract Nodes on a
> local Shapefile?
>
> # In my IDLE Python, I do this by typing:
> from qgis.core import QgsApplication
> from processing.core.Processing import Processing
> import processing
> qgis = QgsApplication([], True)
> qgis.setPrefixPath('C:/Program Files/QGIS 2.18/apps/qgis', True)
> qgis.initQgis()
> Processing.initialize()
> processing.runalg('qgis:extractnodes', 'C:\river.shp', 'C:\result.shp')
>
> # But when I try in PyWPS, the program stops in "Processing.initialize()",
> then I need to kill the process.
>
> Any suggestions?
>
> Thanks
>
> 2017-01-02 19:54 GMT-02:00 Eduardo Silverio da Silva <
> eduardosilverio1990 at gmail.com>:
>
>> Hi,
>>
>> The way I configured the path was by accessing: Control Panel > System and
>> Security > System > Advanced system settings > Environment Variables...
>> (Image attached)
>>
>> I also have tested with the following code just at the begining of the
>> code:
>>
>> import sys
>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\bin")
>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\qgis\bin")
>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\qgis\python")
>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\Python27\Lib\site-
>> packages")
>> sys.path.append("C:\Program Files (x86)\QGIS 2.18\apps\qgis\python\plugins"
>> )
>>
>> and I got the same error: "No module named qgis.core".
>>
>> Well, thanks by the help!
>>
>> Eduardo
>>
>> 2017-01-02 18:56 GMT-02:00 Jáchym Čepický <jachym.cepicky at gmail.com>:
>>
>>> Well,
>>>
>>> I have no idea, how you confiured the PYTHONPATH
>>>
>>> but try (already proposed)
>>>
>>> import sys
>>> sys.path.append("/path/to/qgis/")
>>>
>>> J
>>>
>>> Dne 2.1.2017 v 21:54 Eduardo Silverio da Silva napsal(a):
>>>
>>>> I have checked the GetCapabilities by accessing:
>>>> http://localhost:8080/cgi-bin/pywps.cgi?service=wps&request=
>>>> GetCapabilities&version=1.0.0
>>>> and it is okay. I can even execute the example process "inputs_added".
>>>>
>>>> Then a have checked the log messages and the result is:
>>>>
>>>> PyWPS [2017-01-02 18:49:34,355] INFO: Setting PYWPS_PROCESSES from
>>>> configuration file to c:/pywps/pywps_processes
>>>> PyWPS [2017-01-02 18:49:34,388] WARNING: Could not import processes from
>>>> 'pywps_processes': ImportError('No module named qgis.core',)
>>>> PyWPS [2017-01-02 18:49:34,424] INFO: Following processes are imported:
>>>> ['inputs_added']
>>>> Traceback (most recent call last):
>>>> File "C:/pywps\pywps\Wps\__init__.py", line 174, in
>>>> _init_from_directory
>>>> [processSources.__name__])
>>>> File "c:/pywps/pywps_processes\processing.py", line 2, in <module>
>>>> from qgis.core import *
>>>> ImportError: No module named qgis.core
>>>>
>>>> As we can see, the only process imported was the "input_added", while my
>>>> other algorithm "processing" gave an ImportError.
>>>>
>>>> Eduardo,
>>>>
>>>> 2017-01-02 18:42 GMT-02:00 Jáchym Čepický <jachym.cepicky at gmail.com>:
>>>>
>>>> Hi,
>>>>>
>>>>> first check, if your GetCapabilities response is ok (
>>>>> http://server/wps?service=wps&request=getcapabilities) - maybe the
>>>>> plugin
>>>>> is corrupted (it's not the stablest piece of software).
>>>>>
>>>>> Then please one more time: check the error.log of your web server, there
>>>>> should be written more - you can pass any exception or error message
>>>>> either
>>>>> to the mailing list or share it via pastebin.net or similar service
>>>>>
>>>>> J
>>>>>
>>>>> Dne 2.1.2017 v 21:38 Eduardo Silverio da Silva napsal(a):
>>>>>
>>>>> In my case I am using QGIS 2.18 (x32) and Python 2.7.13 (x32) on Windows
>>>>>> 10, and I have already added the following environment variables:
>>>>>>
>>>>>> PYTHONPATH:
>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\qgis\python
>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\qgis\python\plugins
>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\Python27\Lib\site-packages
>>>>>>
>>>>>> PATH:
>>>>>> C:\Program Files (x86)\QGIS 2.18\bin
>>>>>> C:\Program Files (x86)\QGIS 2.18\apps\qgis\bin
>>>>>> C:\Python27
>>>>>> C:\Python27\Scripts
>>>>>>
>>>>>> Here is the code where I want to import the classes:
>>>>>>
>>>>>> #I would like to use these classes:
>>>>>> # from qgis.core import *
>>>>>> # from qgis.gui import *
>>>>>> # from processing.core.Processing import Processing
>>>>>> # import processing
>>>>>>
>>>>>> from pywps.Process import WPSProcess
>>>>>> from types import FloatType
>>>>>>
>>>>>> class Process(WPSProcess):
>>>>>> def __init__(self):
>>>>>> WPSProcess.__init__(self,
>>>>>> identifier = "processar",
>>>>>> title = "Title",
>>>>>> version = "1",
>>>>>> storeSupported = "false",
>>>>>> statusSupported = "false",
>>>>>> abstract = "Abstract")
>>>>>>
>>>>>> self.value1 = self.addLiteralInput(identifier = "value1",
>>>>>> title
>>>>>> =
>>>>>> "Input 1", type = FloatType)
>>>>>> self.value2 = self.addLiteralInput(identifier = "value2",
>>>>>> title
>>>>>> =
>>>>>> "Input 2", type = FloatType)
>>>>>> self.result = self.addLiteralOutput(identifier = "result",
>>>>>> title =
>>>>>> "Result", type = FloatType)
>>>>>>
>>>>>> def execute(self):
>>>>>> # Here I would like to write the necessary code to execute the
>>>>>> qgis:extractnodes algorithm:
>>>>>> # processing.runalg('qgis:extractnodes', 'river.shp',
>>>>>> 'output.shp')
>>>>>>
>>>>>> v1 = self.value1.getValue()
>>>>>> v2 = self.value2.getValue()
>>>>>> self.result.setValue(v1 + v2)
>>>>>> return
>>>>>> --------------------------------------
>>>>>>
>>>>>> But even with those PATH variables configured I could not access the
>>>>>> algorithm via WPS-client plugin.
>>>>>>
>>>>>> Regards,
>>>>>>
>>>>>>
>>>>>> 2017-01-02 17:31 GMT-02:00 Salvatore Larosa <lrssvtml at gmail.com>:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>>>
>>>>>>> On Mon, Jan 2, 2017 at 4:31 PM, Eduardo Silverio da Silva <
>>>>>>> eduardosilverio1990 at gmail.com> wrote:
>>>>>>>
>>>>>>> Hello people,
>>>>>>>
>>>>>>>>
>>>>>>>> I have a python script that uses some classes from qgis and it runs
>>>>>>>> correctly in my standalone app (IDLE Python). But when I try to
>>>>>>>> publish
>>>>>>>> the
>>>>>>>> script through PyWPS (3.2.5), the process does not apear in the list
>>>>>>>> of
>>>>>>>> GetCapabilities. I think the problem is with the following imports:
>>>>>>>>
>>>>>>>> from qgis.core import *
>>>>>>>> from qgis.gui import *
>>>>>>>> from processing.core.Processing import Processing
>>>>>>>>
>>>>>>>> When I comment these lines the algorithm is showed.
>>>>>>>>
>>>>>>>>
>>>>>>>> I guess the problem is with your environment variable, you should
>>>>>>> add the
>>>>>>> QGIS python and plugins paths to PYTHONPATH and probably the QGIS lib
>>>>>>> path
>>>>>>> to LD_LIBRARY.
>>>>>>>
>>>>>>> Also, any error message could be useful in order to get some help from
>>>>>>> the
>>>>>>> community. :)
>>>>>>>
>>>>>>> Regards,
>>>>>>> -SL
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Salvatore Larosa
>>>>>>> linkedIn: http://linkedin.com/in/larosasalvatore
>>>>>>> twitter: @lrssvt
>>>>>>> skype: s.larosa
>>>>>>> IRC: lrssvt on freenode
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> pywps-dev mailing list
>>>>>> pywps-dev at lists.osgeo.org
>>>>>> http://lists.osgeo.org/mailman/listinfo/pywps-dev
>>>>>>
>>>>>>
>>>>>> --
>>>>> Jachym Cepicky
>>>>> e-mail: jachym.cepicky at gmail.com
>>>>> twitter: @jachymc
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>> --
>>> Jachym Cepicky
>>> e-mail: jachym.cepicky at gmail.com
>>> twitter: @jachymc
>>>
>>
>>
>>
>> --
>> Eduardo Silverio da Silva
>> Mestrando em Ciências Geodésicas na Universidade Federal do Paraná
>> Engenheiro Cartógrafo e Agrimensor
>> +55 41 99873-6274 <+55%2041%2099873-6274>
>>
>
>
>
--
Jachym Cepicky
e-mail: jachym.cepicky at gmail.com
twitter: @jachymc
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