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7.Ros2系列课程之-Python编写客户端引用自定义服务接口

  • 2026-06-30 14:07:37
7.Ros2系列课程之-Python编写客户端引用自定义服务接口

上期我们完成了天气服务端(Server)的编写,它能根据日期随机返回天气。但如果每次都要手动敲命令去查询,那就太麻烦了!🥱

今天,我们要编写客户端(Client),让程序自动、定时地去请求天气服务,实现全自动的“天气播报员”!🌦️


🛠️ 一、客户端编写步骤介绍

用 Python 编写 ROS2 客户端,通常遵循以下 5 个标准步骤:

  1. 导入服务接口:引入我们自定义的 GetWeather消息类型。

  2. 创建请求结果接收回调函数:定义一个函数,专门处理服务端返回的结果。

  3. 声明并创建客户端:在节点中注册这个客户端,连接到指定的服务。

  4. 编写结果接收逻辑:在回调函数中打印或处理收到的天气数据。

  5. 调用客户端发送请求:主动向服务端发送请求数据(比如当前日期)。


🐍 二、Python 客户端代码编写

本次代码将编写在 weather_py_client 功能包中。请确保该功能包已创建并依赖 rclpy和 weather_service_demo(存放 srv 接口的包)。

在 weather_py_client包的 weather_py_client目录下,创建 weather_client.py

1. 完整代码

import rclpyfrom rclpy.node importNode# 1. 导入自定义的服务接口 (注意这里是导入上一章的包)from weather_service_demo.srv import GetWeatherimport datetimeclass WeatherClient(Node):    def __init__(self):        super().__init__('weather_client')        # 3. 声明并创建客户端        self.cli = self.create_client(GetWeather, 'get_weather')        # 等待服务端上线        while not self.cli.wait_for_service(timeout_sec=1.0):            self.get_logger().info('Service not available, waiting again...')        self.get_logger().info('Weather Client is ready.')    # 2. 创建请求结果接收回调函数    def send_request(self):        # 5. 调用客户端发送请求        # 获取当前日期作为请求参数        today = datetime.datetime.now().strftime("%Y-%m-%d")        request = GetWeather.Request()        request.date = today        self.get_logger().info(f'Sending request for date: {today}')        # 发送请求并等待响应        future = self.cli.call_async(request)        future.add_done_callback(self.response_callback)    # 4. 编写结果接收逻辑    def response_callback(self, future):        try:            response = future.result()            self.get_logger().info(f'Received weather: {response.weather_status}')        except Exception as e:            self.get_logger().error(f'Service call failed: {e}')def main(args=None):    rclpy.init(args=args)    weather_client = WeatherClient()    # 每隔1秒发送一次请求    while rclpy.ok():        weather_client.send_request()        rclpy.spin_once(weather_client, timeout_sec=1.0)    weather_client.destroy_node()    rclpy.shutdown()if __name__ == '__main__':    main()
2. 配置编译文件 (setup.py)

在 weather_py_client包的 setup.py中添加入口点:

entry_points={    'console_scripts': [        'weather_client = weather_py_client.weather_client:main',    ],},

🧪 三、Python 客户端测试

现在,让我们把上一章的服务端这次的客户端都跑起来!

1. 编译工作空间

回到工作空间根目录,执行编译:

colcon buildsource install/setup.bash

2. 运行测试

打开两个终端:

终端 1:启动服务端(来自 weather_service_demo 包)

ros2 run weather_py_server weather_py_server

终端 2:启动客户端(来自 weather_py_client 包)

ros2 run weather_py_client weather_client

预期效果

你会看到客户端每隔 1 秒钟,自动发送一次请求(带上当前日期),服务端收到后随机返回一个天气(如 Sunny, Rainy),并回传给客户端显示。


📢 下期预告

我们已经用 Python 玩转了服务和客户端。但在追求极致性能的工业场景,C++ 才是主力。下期我们将挑战 C++ 编写服务端引用自定义服务接口!🚀

💬 互动一下:

你觉得这个“天气客户端”还能怎么玩?比如结合天气预报 API 做一个真实的天气查询?欢迎在评论区分享你的脑洞!👇

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  1. CONNECT:[ UseTime:0.000737s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000939s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000342s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000300s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000632s ]
  6. SELECT * FROM `set` [ RunTime:0.000234s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000504s ]
  8. SELECT * FROM `article` WHERE `id` = 498193 LIMIT 1 [ RunTime:0.000406s ]
  9. UPDATE `article` SET `lasttime` = 1783032105 WHERE `id` = 498193 [ RunTime:0.009457s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000248s ]
  11. SELECT * FROM `article` WHERE `id` < 498193 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000589s ]
  12. SELECT * FROM `article` WHERE `id` > 498193 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002115s ]
  13. SELECT * FROM `article` WHERE `id` < 498193 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001064s ]
  14. SELECT * FROM `article` WHERE `id` < 498193 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001608s ]
  15. SELECT * FROM `article` WHERE `id` < 498193 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.029195s ]
0.120999s