Example Client

The following client operates lomenergy. Depending on the command line the current position is read or, if a destination is supplied, the motor is moved.

#!/usr/bin/python 
#
from PyTango import *
import sys, time, termios

init = 0

def inkey():
    global init
    if( not init):
	init = 1
	fd = sys.stdin.fileno()
	old = termios.tcgetattr( fd)
	new = termios.tcgetattr( fd)
	new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
	#
	# VMIN - the minimum number of characters to be read
	#
	new[6] [termios.VMIN] = 0
	#
	# VTIME - how long the driver waits for VMIN characters, unit 0.1s
	#
	new[6] [termios.VTIME] = 1
	termios.tcsetattr( fd, termios.TCSADRAIN, new)
	sys.exitfunc = lambda: termios.tcsetattr( fd, termios.TCSADRAIN, old)
	    
    key = sys.stdin.read(1)
    if( len( key) == 0):
	key = -1
    else:
	key = ord( key)
    return key
#
# move a motor
#
def move_to( sps, newPos):
    attr= sps.read_attribute( "UnitLimitMin")
    minPos =  attr.value
    attr = sps.read_attribute( "UnitLimitMax")
    maxPos =  attr.value
    print " min ", minPos, ", max ", maxPos
    if (newPos > maxPos or newPos < minPos):
	print "\n Position", newPos, "outside limits", minPos, maxPos
	return 0

    posAttr = sps.read_attribute( "Position")
    posAttr.value = newPos
    sps.write_attribute( posAttr)
    status = 1 
    while (sps.state() == DevState.MOVING):
	print " Current position ",sps.read_attribute( "Position").value
	time.sleep( 0.2)
	if inkey() == 32:
	    print " stopping all moves"
	    sps.command_inout( "StopMove")
	    return 0
    return 1	
#
# main
#
try :
    sps = DeviceProxy( "//haso107XX:10000/pXX/lomenergy/exp.01")

    if( len( sys.argv) == 1):
	print " Current position ", sps.read_attribute( "Position").value
    else:
	move_to( sps, float(sys.argv[1]))
    
except Exception, inst :
    print "Failed with exception !"
    print sys.exc_info()[0]
    print type(inst)     # the exception instance
    print inst.args      # arguments stored in .args