from abstract_instrument import abstract_instrument
  import socket
  
  #==============================================================================
  
  ALL_VAL_TYPE = "DCV, ACV, DCI, ACI, RES2W, RES4W, FREQ"
  
  #==============================================================================
  
  class AG34461A(abstract_instrument):

  	def __init__(self, adress="192.168.0.61", vtype="DCV"):
  		self.adress = adress
  		self.port = 5025
  		self.vtype = vtype

  	def model(self):
  		self.send("*IDN?")
  		return self.read()

  	def connect(self):
  		try:
  			print('Connecting to device @%s:%s...' %(self.adress, self.port))
  			self.sock = socket.socket(socket.AF_INET,
  								 socket.SOCK_STREAM,
  								 socket.IPPROTO_TCP)
  			self.sock.settimeout(10.0)	# Don't hang around forever
  			self.sock.connect((self.adress, self.port))
  			print('  --> Ok')

  			print(self.model())

  			if self.vtype == "DCV":
  				self.send("CONF:VOLT:DC")
  			elif self.vtype == "ACV":
  				self.send("CONF:VOLT:AC")
  			elif self.vtype == "DCI":
  				self.send("CONF:CURR:DC")
  			elif self.vtype == "ACI":
  				self.send("CONF:CURR:AC")
  			elif self.vtype == "RES2W":
  				self.send("CONF:RES")
  			elif self.vtype == "RES4W":
  				self.send("CONF:FRES")
  			elif self.vtype == "FREQ":
  				self.send("CONF:FREQ")
  			else:
  				print("Wrong -v argument")
  				raise

  		except socket.timeout:
  			print("Socket timeout error during connection.")
  			raise
  		except socket.error as er:
  			print("Socket error during connection: " + str(er))
  			raise
  		except Exception as er:
  			print("Unexpected error during connection: " + str(er))
  			raise

  	def getValue(self):
  		self.send("READ?")
  		return self.read()

  	def read(self):
  		ans = ''
  		nb_data_list = []
  		nb_data = ''
  		try:
  			while ans != '
  ':
  				ans = self.sock.recv(1)
  				nb_data_list.append(ans) # Return the number of data
  			list_size = len(nb_data_list)
  			for j in range (0, list_size):
  				nb_data = nb_data+nb_data_list[j]
  			return nb_data
  		except socket.timeout:
  			print "Socket timeout error when reading."
  			raise

  	def disconnect(self):
  		self.send('*RST')
  		self.sock.close()

  	def send(self, command):
  		self.sock.send("%s
  "%command)