Hi Pierluigi,
Are you sure the creation of the geometry is ok?
Because your code with some hardcoded values in it, just works in my python
console:
vl = QgsVectorLayer("LineString", "braiding_river", "memory")
pr = vl.dataProvider()
# add fields
pr.addAttributes([
QgsField("reach", QVariant.String),
QgsField("braiding", QVariant.Double),
QgsField("Length", QVariant.Double)])
vl.updateFields()
print(f"{vl.isValid()=}")
feat_list=[]
fet = QgsFeature()
fet.setGeometry(QgsGeometry.fromWkt('LINESTRING (30 10, 10 30, 40 40)'))
fet.setAttributes([ 'test', 2, 2])
print(f"{fet.isValid()=}")
feat_list.append(fet)
(result, newFeatures) = pr.addFeatures(feat_list)
print(f"{result=}")
print(newFeatures)
Regards,
Richard Duivenvoorde
On 4/4/24 9:58 AM, pierluigi de rosa via QGIS-Developer wrote:
vl = QgsVectorLayer("LineString", "braiding_river", "memory")
vl.setCrs(crs)
pr = vl.dataProvider()
# add fields
pr.addAttributes([
QgsField("reach", QVariant.String),
QgsField("braiding", QVariant.Double),
QgsField("Length", QVariant.Double)])
vl.updateFields()
feat_list=[]
then I populate the layer where inside a for cycle I have
fet = QgsFeature()
fet.setGeometry(QgsGeometry.fromPolylineXY(reach)) #reach is a list of
QgsPointXY
fet.setAttributes([ str(breakval), brIndex, lenReach])
feat_list.append(fet)
Outside for cycle I do:
(result, newFeatures) = pr.addFeatures(feat_list)
But I have always result to False so the feature is not added.
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