On Sat, 25 Jan 2020 at 01:43, Enrico Ferreguti <[email protected]> wrote:
>
> Hi QGIS developers,
>
> I would like to programmatically show a processing algoritm dialog from
> python. I gived a look to processing toolbox and I found that this is
> possible importing and instantiating the class AlgorithmDialog
> [gui/processingToolbox.py][1]
>
> from processing.gui.AlgorithmDialog import AlgorithmDialog
> from qgis.core import QgsApplication
>
> alg =
> QgsApplication.processingRegistry().algorithmById('qgis:extractbyattribute')
> dlg = AlgorithmDialog(alg, False, iface.mainWindow())
> dlg.show()
> dlg.exec_()
>
> This opens algorithm dialog and let me perform processing computations but
> once closed the dialog window QGIS become instable and crash without any
> message interacting with the user interface.
>
> What am I doing wrong? Is there a method to do this in other way?
Yep - there's a built in method which does this for you.
You want either
from qgis.processing import createAlgorithmDialog
dlg = createAlgorithmDialog('qgis:extractbyattribute', parameters={})
dlg.exec_()
OR
from qgis.processing import execAlgorithmDialog
results = execAlgorithmDialog('qgis:extractbyattribute', parameters={})
(check the docs for each for the full details)
In general, try to avoid any "from processing.* " imports -- those are
all internal details and not considered stable API. Anything in
"qgis.processing" IS stable and is public API, designed for external
use.
Nyall
>
> I just posted the question on StackExchange:
> https://gis.stackexchange.com/questions/348542/open-qgis-prococessing-algorithm-dialog-with-python
>
> Thanks in advance.
> Enrico Ferreguti.
>
> [1]:
> https://github.com/qgis/QGIS/blob/276a31439eb95f9cdb1053a6ae2dba3f19fbcece/python/plugins/processing/gui/ProcessingToolbox.py#L262
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