Print composer

gistfile1.txt

from qgis.core import *
from qgis.gui import *
from PyQt4.QtCore import *
from PyQt4.QtGui import QApplication
from PyQt4.QtXml import *
import sys
import xml.etree.ElementTree as ET

app = QgsApplication([], True)

QgsApplication.setPrefixPath("C:/OSGeo4w/apps/qgis-dev", True)
QgsApplication.initQgis()

project = "composer.qgs"
template = "template.qpt"

QgsProject.instance().setFileName(project)
QgsProject.instance().read()

doc = QDomDocument()
doc.setContent(QFile(project), False)

templateDOM = QDomDocument()
templateDOM.setContent(QFile(template), False)

layers = doc.elementsByTagName("maplayer")
layerset = []

for x in xrange(layers.count()):
	layerDOM = layers.at(x)
 	layer = QgsVectorLayer()
 	layer.readXML(layerDOM)
 	QgsMapLayerRegistry.instance().addMapLayer(layer)
 	layerset.append(layer.id())

newlayers = []
for layer in reversed(layerset):
	newlayers.append(layer)

myMapRenderer = QgsMapRenderer()
mLBL = QgsPalLabeling()
myMapRenderer.setLabelingEngine(mLBL)
myMapRenderer.setLayerSet(newlayers)
myMapRenderer.setProjectionsEnabled(False)

comp = QgsComposition(myMapRenderer)
comp.loadFromTemplate(templateDOM,{'Name':"Water", 'Tag':'FooBar'})
comp.exportAsPDF("composer.pdf")
QgsApplication.exitQgis()

Hiya - I've been trying to use a modified version of this script to load and print some layers according to a QGIS composer I have. The problem is the layer.readXML(layerDOM) line isn't producing valid layers, even though my project XML file seems to have been found ok. Any tips/tricks here?

just in case anyone comes across this again, I think now you will probably have to use:

layer.readlayerXML(layerDOM.toElement()) 

in line 32.

Also might be wise to check that the layer in the project is a vector, not a raster.
Something like:

nodeAttributes = layerDOM.attributes()
thisatt = nodeAttributes.namedItem('type')

and check if thisatt.nodeValue is raster or vector.

Hi @NathanW2,

Do you have an updated version of this on QGIS 3.X?

I'm trying to launch an Automated Maps creation from the commandline and my google searches ended here.

Best wishes!

Arnaud

@ponceta this is a perfect use case for QGIS server IMO