publish

目录 1.功能包的创建 2.功能包的源代码编写 3.功能包的编译配置及编译 4.功能包的启动运行 通过上一节编写 ROS 的第一个程序 hello_world ，我们对 ROS 的整个编程开发过程有了基本的了解，现在我们就来编写真正意义上的使用 ROS 进行节点间通信的程序。由于之前已经建好了 catkin_ws 这样一个工作空间，以后开发的功能包都将放在这里面，这里给新建的功能包取名为 topic_example ，在这个功能包中分别编写两个节点程序 publish_node.cpp 和 subscribe_node.cpp ，发布节点（ publish_node ）向话题（ chatter ）发布 std_msgs::String 类型的消息，订阅节点（ subscribe_node ）从话题（ chatter ）订阅 std_msgs::String 类型的消息，这里消息传递的具体内容是一句问候语“ how are you ... ”，通信网络结构如图 16 。 （ 图 16 ） 消息发布与订阅 ROS 通信网络结构图 1.功能包的创建 在 catkin_ws/src/ 目录下新建功能包 topic_example ，并在创建时显式的指明依赖 roscpp 和 std_msgs 。打开命令行终端，输入命令： cd ~/catkin_ws/src/ #创建功能包topic

单表查询 准备工作 创建数据库 ​ 在 cmd 里创建数据库 settings DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'orm001', 'USER':'root', 'PASSWORD':'123', 'HOST':'127.0.0.1', 'PORT':3306, } } 修改链接方法 ​ 项目文件夹下的 init 文件中写上下面内容,用 pymysql 替换 mysqldb import pymysql pymysql.install_as_MySQLdb() 创建数据库表 models.py class Userinfo(models.Model): id = models.AutoField(primary_key=True) name = models.CharField(max_length=10) bday = models.DateField() checked = models.BooleanField() # 在已经创建成功的表中添加新字段, 需要设置默认值,对应默认不为空的已经有的记录的新字段的值 # 或者在新字段的参数中设置null=True 执行命令创建 python3 manage.py makemigrations python3 manage

Serializer 序列化准备： 模型层：models.py class User(models.Model): SEX_CHOICES = [ [0, '男'], [1, '女'], ] name = models.CharField(max_length=64) pwd = models.CharField(max_length=32) phone = models.CharField(max_length=11, null=True, default=None) sex = models.IntegerField(choices=SEX_CHOICES, default=0) icon = models.ImageField(upload_to='icon', default='icon/default.jpg') class Meta: db_table = 'user' verbose_name = '用户' verbose_name_plural = verbose_name def __str__(self): return '%s' % self.name 后台管理层：admin.py from django.contrib import admin from . import models admin.site.register(models.User) 配置层

十大接口 一、Response响应封装 1.1封装 from rest_framework.response import Response class APIResponse(Response): def __init__(self, status=0, msg="ok", results=None, http_status=None, headers=None, exception=False, **kwargs): data_dic = { # json的response基础有数据状态码和数据状态信息 "status": status, "msg": msg, } if results is not None: # 后台有数据，响应数据 data_dic['results'] = results if kwargs: data_dic.update(**kwargs) # 后台的一切自定义响应数据直接放到响应数据data中 super().__init__(data=data_dic, status=http_status, headers=headers, exception=exception) 1.2使用 class MyAPIView(APIView): def get(self, request, *args, **kwargs): pk = kwargs.get(

I just tried to publish my app for the first time - I went through the steps on Developer Console and it says "published" now with a green check mark (after I hit "activate" and "publish", with no errors) However, I tried searching by name on the Google Play store ( it's called "Urbanary Challenge" ) on my phone, tablet, and chrome browser but nothing shows up. (same with company name search). Then, I tried by direct URL: https://play.google.com/store/apps/details?id=com.shameless.studios.twisted.trivia and the id is the "package name" under my AndroidManifest.xml like: <manifest xmlns:android

ORM表之间高级设计 一、表的继承 # db_test1 # 一、基表 # Model类的内部配置Meta类要设置abstract=True， # 这样的Model类就是用来作为基表 # 多表：Book，Publish，Author，AuthorDetail class BaseModel(models.Model): # 实现表公共字段的继承 create_data = models.DateTimeField(auto_now_add=True) is_delete = models.BooleanField(default=False) class Meta: # 基表必须设置abstract，基表就是给普通Model类继承使用的 # ，设置了abstract就不会完成数据库迁移完成建表，这张表不会被创建 abstract = True class Book(BaseModel): # 书 name = models.CharField(max_length=49) price = models.DecimalField(max_digits=5, decimal_places=2) class Publish(BaseModel): # 出版社 name = models.CharField(max_length=50) address = models.CharField

把十大接口做完了才能更好的了解后面的视图类 1.(重点)二次封装Response;自定义APIResponse继承Response,重写 ____init____方法 from rest_framework.response import Response #导入Response类 class APIResponse(Response): #继承Response类 def __init__(self,status=0,msg='ok',results=None,http_status=None,headers=None,exception=None,**kwargs): #重写__init__方法 data = { 'status':status, 'msg':msg } if results is not None: data['result'] = results data.update(**kwargs) #接收其他多余参数 # 再使用父类的__init__方法 super().__i 2.(正常)在orm的模型表中,设置了abstract为True的模型类,称之为基类,这样的模型类是专门作为基类来提供公有属性的(基类不会参与数据迁移) class BaseModel(models.Model): #继承基础模型类 is_delete = models

Alright, I'm having a tough time locating the problem since it works locally but after doing a publish the results are simply: Error Code: 403 Forbidden. The server denied the specified Uniform Resource Locator (URL). Contact the server administrator. (12202) The code: [RoutePrefix("api/v1/project")] public class ProjectController : BaseApiController { [HttpGet] public HttpResponseMessage GetProjects() { HttpResponseMessage resp = new HttpResponseMessage(HttpStatusCode.OK); if(User.Identity.IsAuthenticated) { var model = new ModelFactory().CreateProjects(); resp = Request.CreateResponse

因为设置了 gihub 的 packages 配置，去掉就好 "publishConfig": { 　　"registry": "https://npm.pkg.github.com/" }, 报错信息如下 ERR! code E404 npm ERR! 404 Not Found - PUT https://npm.pkg.github.com/zswui npm ERR! 404 npm ERR! 404 'zswui@0.0.41' is not in the npm registry. npm ERR! 404 You should bug the author to publish it (or use the name yourself!) npm ERR! 404 npm ERR! 404 Note that you can also install from a npm ERR! 404 tarball, folder, http url, or git url 　　 来源： https://www.cnblogs.com/winyh/p/11919428.html