MicrodiffCamera.py

"""Class for cameras connected to framegrabbers run by Taco Device Servers
"""
from HardwareRepository import BaseHardwareObjects
import logging
import os
import PyTango

#try:
#  import Image
#except ImportError:
#  logging.getLogger("HWR").warning("PIL not available: cannot take snapshots")
#  canTakeSnapshots=False
#else:
#  canTakeSnapshots=True


class MicrodiffCamera(BaseHardwareObjects.Device):
    def _init(self):
      try:
        self.device = PyTango.DeviceProxy(self.tangoname)
      except PyTango.DevFailed, traceback:
        last_error = traceback[-1]
        logging.getLogger('HWR').error("%s: %s", str(self.name()), last_error['desc'])
    
        self.device = BaseHardwareObjects.Null()
      else:
        self.setIsReady(True)


    def takeSnapshot(self, *args):
      jpeg_data=self.device.GrabImage()
      f = open(*(args + ("w",)))
      f.write("".join(map(chr, jpeg_data)))
      f.close()