Package rospy :: Module topics :: Class Topic

Class Topic

object --+
         |
        Topic

Known Subclasses:

Base class of Publisher and Subscriber

Instance Methods

__init__(self, name, data_class, reg_type)
x.__init__(...) initializes x; see x.__class__.__doc__ for signature

source code

int

get_num_connections(self)
get the number of connections to other ROS nodes for this topic.

source code

unregister(self)
unpublish/unsubscribe from topic.

source code

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties
Inherited from `object`: `__class__`

Method Details

init(self, name, data_class, reg_type)
(Constructor)

source code

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Parameters:

name (str) - graph resource name of topic, e.g. 'laser'.
data_class (Message @param reg_type Registration.PUB or Registration.SUB) - message class for serialization
reg_type (str)

Raises:

ValueError - if parameters are invalid

Overrides: object.__init__

get_num_connections(self)

source code

get the number of connections to other ROS nodes for this topic. For a Publisher, this corresponds to the number of nodes subscribing. For a Subscriber, the number of publishers.

Returns: int: number of connections

unregister(self)

source code

unpublish/unsubscribe from topic. Topic instance is no longer valid after this call. Additional calls to unregister() have no effect.

Class Topic

__init__(self, name, data_class, reg_type) (Constructor)

get_num_connections(self)

unregister(self)

init(self, name, data_class, reg_type)
(Constructor)