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this code fix it

#!/usr/bin/env python
import rospy
import tf

if __name__ == '__main__':
    # initialize node
    rospy.init_node('tf_listener')
    # print in console that the node is running
    rospy.loginfo('started listener node !')
    # create tf listener
    listener = tf.TransformListener()
    # set the node to run 1 time per second (1 hz)
    rate = rospy.Rate(1.0)
    # loop forever until roscore or this node is down
    while not rospy.is_shutdown():
        try:
            # listen to transform
            (trans,rot) = listener.lookupTransform('/map', '/base_link', rospy.Time(0))
            # print the transform
            rospy.loginfo('---------')
            rospy.loginfo('Translation: ' + str(trans))
            rospy.loginfo('Rotation: ' + str(rot))
        except (tf.LookupException, tf.ConnectivityException, tf.ExtrapolationException):
            continue
        # sleep to control the node frequency
        rate.sleep()

this code fix it, I got it here

#!/usr/bin/env python
import rospy
import tf

if __name__ == '__main__':
    # initialize node
    rospy.init_node('tf_listener')
    # print in console that the node is running
    rospy.loginfo('started listener node !')
    # create tf listener
    listener = tf.TransformListener()
    # set the node to run 1 time per second (1 hz)
    rate = rospy.Rate(1.0)
    # loop forever until roscore or this node is down
    while not rospy.is_shutdown():
        try:
            # listen to transform
            (trans,rot) = listener.lookupTransform('/map', '/base_link', rospy.Time(0))
            # print the transform
            rospy.loginfo('---------')
            rospy.loginfo('Translation: ' + str(trans))
            rospy.loginfo('Rotation: ' + str(rot))
        except (tf.LookupException, tf.ConnectivityException, tf.ExtrapolationException):
            continue
        # sleep to control the node frequency
        rate.sleep()

this code fix it, I got it here

the same output: rosrun tf tf_echo /map /base_link

#!/usr/bin/env python
import rospy
import tf

if __name__ == '__main__':
    # initialize node
    rospy.init_node('tf_listener')
    # print in console that the node is running
    rospy.loginfo('started listener node !')
    # create tf listener
    listener = tf.TransformListener()
    # set the node to run 1 time per second (1 hz)
    rate = rospy.Rate(1.0)
    # loop forever until roscore or this node is down
    while not rospy.is_shutdown():
        try:
            # listen to transform
            (trans,rot) = listener.lookupTransform('/map', '/base_link', rospy.Time(0))
            # print the transform
            rospy.loginfo('---------')
            rospy.loginfo('Translation: ' + str(trans))
            rospy.loginfo('Rotation: ' + str(rot))
        except (tf.LookupException, tf.ConnectivityException, tf.ExtrapolationException):
            continue
        # sleep to control the node frequency
        rate.sleep()