harmony(鸿蒙)编写“Hello World”程序

  • 2022-10-28
  • 浏览 (108)

编写“Hello World”程序

下方将展示如何在单板上运行第一个应用程序,其中包括新建应用程序、编译、烧写、运行等步骤,最终输出“Hello World!”。

前提条件

已参考创建工程并获取源码,创建Hi3516开发板的源码工程。

示例目录

示例完整目录如下:

applications/sample/hello
│── BUILD.gn
└── src
    └── helloworld.c

开发步骤

请在源码目录中通过以下步骤创建“Hello World”应用程序。

  1. 新建目录及源码。

新建applications/sample/hello/src/helloworld.c目录及文件,代码如下所示,用户可以自定义修改打印内容(例如:修改OHOS为World)。当前应用程序可支持标准C及C++的代码开发。

   #include <stdio.h>
   
   int main(int argc, char **argv)
   {
       printf("\n\n");
       printf("\n\t\tHello OHOS!\n");
       printf("\n\n\n");
   
       return 0;
   }
  1. 新建编译组织文件。

新建applications/sample/hello/BUILD.gn文件,内容如下所示:

   import("//build/lite/config/component/lite_component.gni")
   lite_component("hello-OHOS") {
     features = [ ":helloworld" ]
   }
   executable("helloworld") {
     output_name = "helloworld"
     sources = [ "src/helloworld.c" ]
   }
  1. 添加新组件。

修改文件build/lite/components/applications.json,添加组件hello_world_app的配置,如下所示为applications.json文件片段,”##start##“和”##end##“之间为新增配置(”##start##“和”##end##“仅用来标识位置,添加完配置后删除这两行):

icon-note.gif 说明: 本章节操作是以OpenHarmony-v3.1-Release版本为例进行操作的,该版本中,组件配置文件为build/lite/components/applications.json;若源码版本大于等于OpenHarmony 3.2 Beta2时,组件配置文件为build/lite/components/communication.json。

   {
     "components": [
       {
         "component": "camera_sample_communication",
         "description": "Communication related samples.",
         "optional": "true",
         "dirs": [
           "applications/sample/camera/communication"
         ],
         "targets": [
           "//applications/sample/camera/communication:sample"
         ],
         "rom": "",
         "ram": "",
         "output": [],
         "adapted_kernel": [ "liteos_a" ],
         "features": [],
         "deps": {
           "components": [],
           "third_party": []
         }
       },
   ##start##
       {
         "component": "hello_world_app",
         "description": "hello world samples.",
         "optional": "true",
         "dirs": [
           "applications/sample/hello"
         ],
         "targets": [
           "//applications/sample/hello:hello-OHOS"
         ],
         "rom": "",
         "ram": "",
         "output": [],
         "adapted_kernel": [ "liteos_a" ],
         "features": [],
         "deps": {
           "components": [],
           "third_party": []
         }
       },
   ##end##
       {
         "component": "camera_sample_app",
         "description": "Camera related samples.",
         "optional": "true",
         "dirs": [
           "applications/sample/camera/launcher",
           "applications/sample/camera/cameraApp",
           "applications/sample/camera/setting",
           "applications/sample/camera/gallery",
           "applications/sample/camera/media"
         ],
  1. 修改单板配置文件。

修改文件vendor/hisilicon/hispark_taurus/config.json,新增hello_world_app组件的条目,如下所示代码片段为applications子系统配置,”##start##“和”##end##“之间为新增条目(”##start##“和”##end##“仅用来标识位置,添加完配置后删除这两行):

         {
           "subsystem": "applications",
           "components": [
             { "component": "camera_sample_app", "features":[] },
             { "component": "camera_sample_ai", "features":[] },
   ##start##
             { "component": "hello_world_app", "features":[] },
   ##end##
             { "component": "camera_screensaver_app", "features":[] }
           ]
         },

你可能感兴趣的鸿蒙文章

harmony(鸿蒙)快速入门

harmony(鸿蒙)编译形态整体说明

harmony(鸿蒙)Hi3516标准系统入门(IDE方式)

harmony(鸿蒙)Hi3516标准系统入门(命令行方式)

harmony(鸿蒙)Hi3516开发板介绍

harmony(鸿蒙)Hi3861开发板介绍

harmony(鸿蒙)RK3568开发板介绍

harmony(鸿蒙)编译

harmony(鸿蒙)烧录

harmony(鸿蒙)运行

0  赞