测试消息发布器和订阅器
Description: 本教程将测试上一教程所写的消息发布器和订阅器。Tutorial Level: BEGINNER
Next Tutorial: 写一个简单的服务端和客户端 (python) (c++)
启动发布器
确保roscore可用,并运行:
$ roscore
catkin specific 如果使用catkin,确保你在调用catkin_make后,在运行你自己的程序前,已经source了catkin工作空间下的setup.sh文件:
# In your catkin workspace $ cd ~/catkin_ws $ source ./devel/setup.bash
In the last tutorial we made a publisher called "talker". Let's run it:
$ rosrun beginner_tutorials talker (C++) $ rosrun beginner_tutorials talker.py (Python)
你将看到如下的输出信息:
-
[INFO] [WallTime: 1314931831.774057] hello world 1314931831.77 [INFO] [WallTime: 1314931832.775497] hello world 1314931832.77 [INFO] [WallTime: 1314931833.778937] hello world 1314931833.78 [INFO] [WallTime: 1314931834.782059] hello world 1314931834.78 [INFO] [WallTime: 1314931835.784853] hello world 1314931835.78 [INFO] [WallTime: 1314931836.788106] hello world 1314931836.79
发布器节点已经启动运行。现在需要一个订阅器节点来接受发布的消息。
启动订阅器
上一教程,我们编写了一个名为"listener"的订阅器节点。现在运行它:
$ rosrun beginner_tutorials listener (C++) $ rosrun beginner_tutorials listener.py (Python)
你将会看到如下的输出信息:
-
[INFO] [WallTime: 1314931969.258941] /listener_17657_1314931968795I heard hello world 1314931969.26 [INFO] [WallTime: 1314931970.262246] /listener_17657_1314931968795I heard hello world 1314931970.26 [INFO] [WallTime: 1314931971.266348] /listener_17657_1314931968795I heard hello world 1314931971.26 [INFO] [WallTime: 1314931972.270429] /listener_17657_1314931968795I heard hello world 1314931972.27 [INFO] [WallTime: 1314931973.274382] /listener_17657_1314931968795I heard hello world 1314931973.27 [INFO] [WallTime: 1314931974.277694] /listener_17657_1314931968795I heard hello world 1314931974.28 [INFO] [WallTime: 1314931975.283708] /listener_17657_1314931968795I heard hello world 1314931975.28