Launch启动文件的使用方法
- 案例一:运行两个节点
- 案例二:加载参数与命名空间
- 案例三:小海龟跟随的launch启动方法
- 案例四:remap修改节点名
Launch文件可以通过XML文件实现多节点的配置和启动,省去了启动多个终端与多个节点的复杂操作,同时launch文件也不用进行roscore
案例一:运行两个节点
在工作空间src文件夹内新建一个learning_launch功能包
catkin_creat_pkg learning_launch
touch一个simple.launch文件,打开文件在设置-高亮可以更改为xml语法高亮
<launch>
<node pkg="learning_topic" type="person_subscriber" name="talker" output="screen" />
<node pkg="learning_topic" type="person_publisher" name="listener" output="screen" />
</launch>
catkin_make编译
roslaunch learning_launch simple.launch运行
案例二:加载参数与命名空间
<launch>
<param name="/turtle_number" value="2"/>
<node pkg="turtlesim" type="turtlesim_node" name="turtlesim_node">
<param name="turtle_name1" value="Tom" />
<param name="turtle_name2" value="Jerry"/>
<rosparam file="$(find learning_launch)/config/param.yaml" command="load"/>
</node>
<node pkg="turtlesim" type="turtle_teleop_key" name="turtle_teleop_key" output="screen"/>
</launch>
注意在运行前,要在功能包内创建config文件夹,并创建param.yaml文件,内容如下,group加缩进也为命名空间
案例三:小海龟跟随的launch启动方法
小海龟跟随见上节ROS中的坐标系管理系统
运行c++文件
<launch>
<node pkg="turtlesim" type="turtlesim_node" name="sim"/>
<node pkg="turtlesim" type="turtle_teleop_key" name="teleop" output="screen"/>
<node pkg="learning_tf" type="turtle_tf_broadcaster" args="/turtle1" name="turtle1_tf_broadcaster" />
<node pkg="learning_tf" type="turtle_tf_broadcaster" args="/turtle2" name="turtle2_tf_broadcaster" />
<node pkg="learning_tf" type="turtle_tf_listener" name="listener" />
</launch>
运行python文件,type中加.py
<launch>
<node pkg="turtlesim" type="turtlesim_node" name="sim"/>
<node pkg="turtlesim" type="turtle_teleop_key" name="teleop" output="screen"/>
<node name="turtle1_tf_broadcaster" pkg="learning_tf" type="turtle_tf_broadcaster.py">
<param name="turtle" type="string" value="turtle1" />
</node>
<node name="turtle2_tf_broadcaster" pkg="learning_tf" type="turtle_tf_broadcaster.py">
<param name="turtle" type="string" value="turtle2" />
</node>
<node pkg="learning_tf" type="turtle_tf_listener.py" name="listener" />
</launch>
案例四:remap修改节点名
<launch>
<include file="$(find learning_launch)/launch/simple.launch" />
<node pkg="turtlesim" type="turtlesim_node" name="turtlesim_node">
<remap from="/turtle1/cmd_vel" to="/cmd_vel"/>
</node>
</launch>
roslaunch learning_launch turtlesim_remap.launch
重新打开终端输入rostopic list查看当前话题
之前的/turtle1/cmd_vel已经改为/cmd_vel,可以用这个话题名发布速度指令
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