[QGIS-Developer] How to retrieve all "virtual fields" of a layer?

[Matthias Kuhn 🌍]

Hi Stefan

for attr_idx in range(l.fields().count()):
    if l.fields().fieldOrigin(attr_idx) == QgsFields.OriginExpression:
        print(l.fields()[attr_idx].name())

Cheers
Matthias

On 06/01/2017 02:53 PM, Stefan Keller wrote:
> Thanks Etienne,
>
> But I'm looking for a list of virtual fields (not virtual C++
> functions) from a PyQGIS accessor as they can be defined by the user
> in the "Field Calculator".
>
> :Stefan
>
> 2017-06-01 3:23 GMT+02:00 Etienne Trimaille <etienne.trimaille at gmail.com>:
> > Hi,
> >
> > Both layer.fields() or layer.pendingFields() work for me. I got my virtual
> > field.
> >
> > 2017-06-01 3:34 GMT+08:00 Stefan Keller <sfkeller at gmail.com>:
> >>
> >> Hi,
> >>
> >> In a Python plugin I want to retrieve information about all
> >> attributes/fields of a layer
> >> In the cookbook [1] it's described how to retrieve thems
> >>   for field in layer.pendingFields():
> >>       print field.name(), field.typeName()
> >>
> >> => But how do I get all "virtual fields" programmatically?
> >>
> >> :Stefan
> >>
> >> [1]
> >> http://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/vector.html#retrieving-information-about-attributes
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