[Qgis-developer] SymbologyExport parameter

[Pim Verver]

Hi Tim,

I executed an exact copy of your line of code and got the same error'

This is what I tried:

canvas = iface.mapCanvas()
aLayer = iface.activeLayer()
if aLayer.dataProvider().name() == 'postgres':
    writer =  QgsVectorFileWriter
    error = writer.writeAsVectorFormat(aLayer, r"/tmp/out.shp", "CP1250", None, "ESRI Shapefile", False, None,"","", False, None, QgsVectorFileWriter.NoSymbology, 1.0)

if error == QgsVectorFileWriter.NoError:
    vlayer = QgsVectorLayer(r"D:\Documenten_Travelingo\SkyDrive Pro\Horeca routes\Projectbestanden\deBaak Driebergen\Shape bronnen", aLayer.name() + ".shp", "ogr")
    QgsMapLayerRegistry.instance().addMapLayer(vlayer)

And the error: Tceback (most recent call last):
  File "<input>", line 1, in <module>
  File "D:/Documenten_Travelingo/SkyDrive Pro/Horeca routes/PostgrestoShape.py", line 5, in <module>
    error = writer.writeAsVectorFormat(aLayer, r"/tmp/out.shp", "CP1250", None, "ESRI Shapefile", False, None,"","", False, None, QgsVectorFileWriter.NoSymbology, 1.0)
AttributeError: type object 'QgsVectorFileWriter' has no attribute 'NoSymbology'

I work with the console of  a Dufour 64 bits version on a Windows 8.1 machine. The qgis_core.dll is present in C:\Program Files\QGIS Dufour\apps\qgis\bin. Can it be that the windows version is an old compilation because as I understand the SymbologyExport parameter was just recently added to the source code?

Kind regards
Van: Tim Sutton [mailto:lists at linfiniti.com]
Verzonden: zaterdag 28 december 2013 22:19
Aan: Pim Verver
CC: qgis-developer at lists.osgeo.org
Onderwerp: Re: [Qgis-developer] SymbologyExport parameter

Hi

I'm not sure why the Symbology flag is not working (havent time to look sorry) but a quick fix might be to do this (which worked for me in a quick test):

error = writer.writeAsVectorFormat(aLayer, r"/tmp/out.shp", "CP1250", None, "ESRI Shapefile", False, None,"","", False, None, QgsVectorFileWriter.NoSymbology, 1.0)
aLayer.saveNamedStyle("/tmp/out.qml")

(u'Created default style file as /tmp/out.qml', True)

Hope that helps!

Regards

Tim


On Sat, Dec 28, 2013 at 4:25 PM, Pim Verver <pim at travelingo.nl<mailto:pim at travelingo.nl>> wrote:
Hi,
I am using the QGis python console for the use of exporting an active layer from postgist to a shape file layer.  I want to include the symbology as is possible through the GUI of QGis 2 (Dufour).
I am using the writeAsVectorFormat<http://www.qgis.org/api/classQgsVectorFileWriter.html#a289af78b5b609fbcb0572aaf505f2822> method of the QgsVectorFileWriter class, but keep getting the message that there are "Too many arguments" as if the parameter doesn´t exist. That seems correct given the fact that the mouse popup for the parameters doesn't indicate a Symbology parameter. However in the  official QGis API the parameter is mentioned: http://www.qgis.org/api/classQgsVectorFileWriter.html#a1aac90d30d811d2888d1aab4098ad63c. The symbology parameter seems tob e added in the latest release (QGis 2)
Am I using it the wrong way or is someting else going on?
The alternative would be save the style als SLD and import the style file after creating the shape layer, but if I can avoid that ...
The console code sofar:
canvas = iface.mapCanvas()
aLayer = iface.activeLayer()
if aLayer.dataProvider().name() == 'postgres':
    writer =  QgsVectorFileWriter
    error = writer.writeAsVectorFormat(aLayer, r"D:\Documenten_Travelingo\SkyDrive Pro\Horeca routes\Projectbestanden\deBaak Driebergen\Shape bronnen\\"+ aLayer.name() + ".shp", "CP1250", None, "ESRI Shapefile", False, None,"","", False, None, "NoSymbology", 1.0)
#    then import the shape file in a new layer
if error == QgsVectorFileWriter.NoError:
    vlayer = QgsVectorLayer(r"D:\Documenten_Travelingo\SkyDrive Pro\Horeca routes\Projectbestanden\deBaak Driebergen\Shape bronnen", aLayer.name() + ".shp", "ogr")
    QgsMapLayerRegistry.instance().addMapLayer(vlayer)
Th error is raised at the writeAsVectorFormat method and its parameter NoSymbology.
Thanx in advance
Kinds regards,
Pim Verver


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