[Qgis-user] Access to iface in processing alg

[Jean-Baptiste Desbas]

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 <matthias at 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
>
>
>
> _______________________________________________
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>
> --
> Matthias Kuhn
> matthias at opengis.ch
> +41 (0)76 435 67 63 <+41764356763>
> [image: OPENGIS.ch Logo] <http://www.opengis.ch>
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