Hi, Processing algorithms run often in background threads. That's likely why you are getting a crash, it's not safe to call UI functions from background threads.
It's possible to - run the processing algorithm with a custom QgsProcessingFeedback implementation - make sure that pushInfo etc. is first sent to the main thread as a signal and executed there - return the QgsProcessingAlgorithm.FlagNoThreading from your algorithms flags() method - or consider sticking to the way that processing has been designed for Regards Matthias On 07/09/2018 02:14 PM, Jean-Baptiste Desbas wrote: > > Hi, > > I just want to display a messageBar instead of displaying it un the > processing output console (feedback.pushInfo) It's ni big deal but i > was just confused. > > Do toi have any tips of use case of the differents pushInfo, > pushConsoleInfo, etc. ? > > Thanks > > Le lun. 9 juil. 2018 19:18, Matthias Kuhn <matth...@opengis.ch > <mailto:matth...@opengis.ch>> a écrit : > > Hi, > > can you elaborate why you need access to iface? In most cases > there are different ways that help you keep the algorithm modular > and portable by specifying required components via parameters or > acquiring them from the processing context. > > Best regards > > Matthias > > > On 07/09/2018 09:58 AM, Jean-Baptiste Desbas wrote: >> Hello, >> >> What is the proper way to access iface in a processing alg ? >> >> I try "from qgis.utils import iface" but it crash when i make an >> iface.pushWarning. >> >> Thanks, >> >> Here is the stack trace : >> >> >> >> >> *Crash ID*: 59968a8cbec4e3d98bbe532ada707149cd7f9eee >> >> >> *Stack Trace* >> <pre> >> QgsCustomization::preNotify : >> QObject::event : >> QApplicationPrivate::notify_helper : >> QApplication::notify : >> QgsApplication::notify : >> QCoreApplication::notifyInternal2 : >> QCoreApplicationPrivate::sendPostedEvents : >> qt_plugin_query_metadata : >> QEventDispatcherWin32::processEvents : >> CallWindowProcW : >> DispatchMessageW : >> QEventDispatcherWin32::processEvents : >> qt_plugin_query_metadata : >> QEventLoop::exec : >> QDialog::exec : >> PyCFunction_FastCallDict : >> PyObject_GenericGetAttr : >> PyEval_EvalFrameDefault : >> PyFunction_FastCallDict : >> PyObject_CallFunctionObjArgs : >> PyObject_Call : >> PyInit_QtCore : >> PyInit_QtCore : >> PyInit_QtCore : >> PyInit_QtCore : >> PyInit_QtCore : >> QMetaObject::activate : >> QAbstractItemView::doubleClicked : >> QTreeView::mouseDoubleClickEvent : >> QWidget::event : >> QFrame::event : >> QAbstractItemView::viewportEvent : >> QCoreApplicationPrivate::sendThroughObjectEventFilters : >> QApplicationPrivate::notify_helper : >> QApplication::notify : >> QgsApplication::notify : >> QCoreApplication::notifyInternal2 : >> QApplicationPrivate::sendMouseEvent : >> QSizePolicy::QSizePolicy : >> QSizePolicy::QSizePolicy : >> QApplicationPrivate::notify_helper : >> QApplication::notify : >> QgsApplication::notify : >> QCoreApplication::notifyInternal2 : >> QGuiApplicationPrivate::processMouseEvent : >> QWindowSystemInterface::sendWindowSystemEvents : >> QEventDispatcherWin32::processEvents : >> CallWindowProcW : >> DispatchMessageW : >> QEventDispatcherWin32::processEvents : >> qt_plugin_query_metadata : >> QEventLoop::exec : >> QCoreApplication::exec : >> main : >> BaseThreadInitThunk : >> RtlUserThreadStart : >> </pre> >> >> >> *QGIS Info* >> QGIS Version: 3.2.0-Bonn >> QGIS code revision: commit:bc43194061 >> Compiled against Qt: 5.9.2 >> Running against Qt: 5.9.2 >> Compiled against GDAL: 2.2.4 >> Running against GDAL: 2.2.4 >> >> >> >> *System Info* >> CPU Type: x86_64 >> Kernel Type: winnt >> Kernel Version: 10.0.17134 >> >> >> >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > -- > Matthias Kuhn > matth...@opengis.ch <mailto:matth...@opengis.ch> > +41 (0)76 435 67 63 <tel:+41764356763> > OPENGIS.ch Logo <http://www.opengis.ch> > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org <mailto:Qgis-user@lists.osgeo.org> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > > > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Matthias Kuhn matth...@opengis.ch <mailto:matth...@opengis.ch> +41 (0)76 435 67 63 <tel:+41764356763> OPENGIS.ch Logo <http://www.opengis.ch>
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