鸿蒙OpenHarmony【小型系统编写“Hello World”程序】（基于Hi3516开发板）

news/2024/5/4 8:17:17

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。鸿蒙开发指导文档：gitee.com/li-shizhen-skin/harmony-os/blob/master/README.md点击或者复制转到。

搜狗高速浏览器截图20240326151547.png

示例目录

示例完整目录如下： HarmonyOS与OpenHarmony鸿蒙文档籽料：mau123789是v直接拿

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。

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;
}
```

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" ]
}

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）：

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"],

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":[] }]},
```