Screenshot from paraview

#!/bin/python
import glob, string, os, commands
from paraview.simple import *

#help(servermanager)
# vtp files are inside the local subdir DISPLAY
files = (commands.getoutput("ls DISPLAY/data-*.vtp | grep -v contacts")).split()

# process each file
for filename in files:
    fullfn = commands.getoutput("ls $PWD/" + filename).replace('/','\/')
    fn = filename.replace('DISPLAY/', '')
    #os.system("cp ../dem_git/addons/paraview_state.pvsm tmp.pvsm")
    os.system("cp ~/Desktop/state.pvsm tmp.pvsm")
    os.system("sed -i.bck 's/DATA.vtp/" + fullfn + "/1' tmp.pvsm") # replace first intance with full path
    os.system("sed -i.bck 's/DATA.vtp/" + fullfn + "/1' tmp.pvsm") # replace second intance with full path
    os.system("sed -i.bck 's/DATA.vtp/" + fn + "/1' tmp.pvsm") # replace third with just the filename path
    servermanager.LoadState("tmp.pvsm")
    pm = servermanager.ProxyManager()
    #reader = pm.GetProxy("sources",fullfn)
    #reader.FileNames = fullfn
    #reader.FileNameChanged()
    #reader.UpdatePipeline()
    SetActiveView(GetRenderView())
    Render()
    WriteImage(fn + "-image.png")
    os.system("rm -f tmp.pvsm")
    #servermanager.Finalize()