在ros1中可以使用下面的程序,来获取一条指定话题的数据消息 msg = rospy.wait_for_message('话题名字',话题类型) 1. 该函数实现原理为:创建一个订阅,接收一条消息,取消订阅 https://docs.ros.org/en/diamondback/api/rospy/html/rospy.client-module.html#wait_for_message 照着这个原理,...
第二种方式:rospy.wait_for_message 该方法无需节点,也无需回调函数,其与一个函数类似,等待话题发布消息,当接收到一个消息时,返回数据,继续执行后面的程序。相对于第一种,我们把它称为半阻塞,接收的话题如果没有发布消息,它会一直等待,但是接收到一个消息后,等待结束,会继续执行后面的程序。 msg2 = rospy.wai...
这里我们可以使用r.wait_for(1s);来有效避免延迟导致的问题。 autor = ins_client->async_send_request(new_req_ptr, visual_lane_tracker_on_client_callback);autostatus = r.wait_for(1s);if(status !=std::future_status::ready) RCLCPP_ERROR_STREAM(this->get...
The first timeros2is called for a specific domain ID not all information on the network may be immediately available. If incomplete network information is returned fromros2, wait for a short time before trying again. bag2info= ros2("bag","info",folderpath)returns information about the conten...
message associated with the image conflict # the behavior is undefined uint32 height # image height, that is, number of rows uint32 width # image width, that is, number of columns # The legal values for encoding are in file include/sensor_msgs/image_encodings.hpp # If you want to ...
rclcpp::sleep_for(1s);// Wait for subscriptions to be established to avoid race conditions. // Publish the first message (kicking off the cycle). std::unique_ptr<std_msgs::msg::Int32> msg(newstd_msgs::msg::Int32()); msg->data = 42; ...
Clienthas.wait_for_service() New API for naming Nodes, Topics, Services, Actions, and data types for Topics, Actions, and Services. The new API is more structured to avoid possible confusion and errors from parsing strings. New in version 0.5: ...
msg::Int32::UniquePtr msg){auto pub_ptr=captured_pub.lock();if(!pub_ptr){return;}printf("Received message with value: %d, and address: 0x%"PRIXPTR"\n",msg->data,reinterpret_cast<std::uintptr_t>(msg.get()));printf(" sleeping for 1 second...\n");if(!rclcpp::sleep_for(1s))...
client->wait_for_service(std::chrono::seconds(1))) { RCLCPP_INFO(this->get_logger(), "service not available, waiting again..."); } auto request = std::make_shared<example_interfaces::srv::AddTwoInts::Request>(); request->a = 6; request->b = 4; auto ...
WaitSetSubscriber StaticWaitSetSubscriber TimeTriggeredWaitSetSubscriber demo_nodes_cpp_native demo_nodes_cpp_native::Talker image_tools image_tools::Cam2Image image_tools::ShowImage teleop_twist_joy teleop_twist_joy::TeleopTwistJoy joy joy::Joy ...