开源鸿蒙 编写“Hello World”程序
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!”。
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:
- 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/communication.json,添加组件hello_world_app的配置,如下所示为communication.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):
{
"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":[] }
]
},
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