Removing z-dimension while writing shapefile using PyQGIS

Question

There is such a code:

from PyQt4.QtCore import QVariant
from qgis.core import (QgsFeature, QgsField, QgsFields,
QgsGeometry, QgsPoint, QgsVectorFileWriter)
from qgis.utils import QGis, iface
iface.legendInterface().layers()
sluoksniu_saras=iface.legendInterface().layers()
for cL in sluoksniu_saras:
    fn='D:\\Ko\\'+cL.name()
    ret = QgsVectorFileWriter.writeAsVectorFormat(cL, fn, "Windows-1257",\
    QgsCoordinateReferenceSystem(cL.crs()), driverName="ESRI Shapefile",\
    forceMulti =False, includeZ = False)
    if ret == QgsVectorFileWriter.NoError:
       print "Irasyta i " +fn + " !"
print 'viskas'

In theory, he should write all open layers of the project in a specific folder and reset the z-dimension. Layers are recorded, but the z-dimension is not reset. Where is the mistake? I'm using QGIS 2.16

Answer 1

It's mentioned in the API for QGIS 2.16 that you need to set the overrideGeometryType parameter:

includeZ - set to true to include z dimension in output. This option is only valid if overrideGeometryType is set.

Try including this parameter in your code.

---

Edit:

In response to your comment, you could try something like the following where I assumed you used a point shapefile for the geometry but you can check here for other geometry types:

ret = QgsVectorFileWriter.writeAsVectorFormat(cL, fn, "Windows-1257",\
    QgsCoordinateReferenceSystem(cL.crs()), driverName="ESRI Shapefile",\
    forceMulti =False, overrideGeometryType=QgsWKBTypes.PointZ, includeZ=False)

(Note: I no longer have QGIS 2.16 installed as it is quite old now so cannot test this. You should perhaps consider updating to the latest version)

Answer 2

Working code:

from PyQt4.QtCore import QVariant
from qgis.core import (QgsFeature, QgsField, QgsFields,
QgsGeometry, QgsPoint, QgsVectorFileWriter)
from qgis.utils import QGis, iface
#iface.legendInterface().layers()
sluoksniu_saras=iface.legendInterface().layers()
for cL in sluoksniu_saras:
    fn='D:\\Ko\\'+cL.name()
    geom_name = {0: 1, 1: 2, 2: 3}
    geom_type = cL.geometryType()
    tipas=geom_name[geom_type]
    ret = QgsVectorFileWriter.writeAsVectorFormat(cL, fn, "Windows-1257",\
    QgsCoordinateReferenceSystem(cL.crs()), driverName="ESRI Shapefile",\
    overrideGeometryType=tipas, forceMulti = False, includeZ = False)
    if ret == QgsVectorFileWriter.NoError:
       print "Irasyta i " +fn + " !"
print 'viskas'

Thanks for the help. (Ačiū už pagalbą)