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未验证 提交 cd6de948 编写于 作者: D duangavin123 提交者： Gitee
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update zh-cn/device-dev/quick-start/quickstart-lite-steps-hi3516-application-framework.md. 

Signed-off-by: Nduangavin123 <duanxichao@huawei.com>
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zh-cn/device-dev/quick-start/quickstart-lite-steps-hi3516-application-framework.md
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# 新建应用程序<a name="ZH-CN_TOPIC_0000001171455556"></a>
下方将通过修改源码的方式展示如何编写简单程序，输出“Hello OHOS！”。请在[获取源码](quickstart-lite-sourcecode-acquire.md)章节下载的源码目录中进行下述操作。
1. 新建目录及源码。
新建**applications/sample/camera/apps/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;
}
```
2. 新建编译组织文件。
新建**applications/sample/camera/apps/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" ]
include_dirs = []
defines = []
cflags_c = []
ldflags = []
}
```
3. 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）：
```
{
"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": "Communication related samples.",
"optional": "true",
"dirs": [
"applications/sample/camera/apps"
],
"targets": [
"//applications/sample/camera/apps: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"
],
```
4. 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":[] }
]
},
```
# 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
│── include
│ └── helloworld.h
│── src
│ └── helloworld.c
├── bundle.json
│
│── test
│ └── moduletest
│ └── unittest
│
productdefine/common
└── products
└── Hi3516DV300.json
```
## 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. 创建目录，编写业务代码。
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World为OH）。其中helloworld.h包含字符串打印函数HelloPrint的声明。当前应用程序可支持标准C及C++的代码开发。
```
#include <stdio.h>
#include "helloworld.h"
int main(int argc, char **argv)
{
HelloPrint();
return 0;
}
void HelloPrint()
{
printf("\n\n");
printf("\n\t\tHello World!\n");
printf("\n\n");
}
```
再添加头文件applications/sample/hello/include/helloworld.h，代码如下所示。
```
#ifndef HELLOWORLD_H
#define HELLOWORLD_H
#ifdef __cplusplus
#if __cplusplus
extern "C" {
#endif
#endif
void HelloPrint();
#ifdef __cplusplus
#if __cplusplus
}
#endif
#endif
#endif // HELLOWORLD_H
```
2. 新建编译组织文件。
1. 新建applications/sample/hello/BUILD.gn文件，内容如下所示：
```
import("//build/ohos.gni") # 导入编译模板
ohos_executable("helloworld") { # 可执行模块
sources = [ # 模块源码
"src/helloworld.c"
]
include_dirs = [ # 模块依赖头文件目录
"include"
]
cflags = []
cflags_c = []
cflags_cc = []
ldflags = []
configs = []
deps =[] # 部件内部依赖
part_name = "sample" # 所属部件名称，必选
install_enable = true # 是否默认安装（缺省默认不安装），可选
}
```
2. 新建applications/sample/bundle.json文件，添加sample部件描述，内容如下所示。
```
{
"name": "@ohos/hello",
"description": "Hello world example.",
"version": "3.1",
"license": "Apache License 2.0",
"publishAs": "code-segment",
"segment": {
"destPath": "applications/sample/hello"
},
"dirs": {},
"scripts": {},
"component": {
"name": "hello",
"subsystem": "applications",
"syscap": [],
"features": [],
"adapted_system_type": [
"mini",
"small",
"standard"
],
"rom": "10KB",
"ram": "10KB",
"deps": {
"components": [],
"third_party": []
},
"build": {
"sub_component": [
"//applications/sample/hello:helloworld"
],
"inner_kits": [],
"test": [
"//applications/sample/hello/test:moduletest",
"//applications/sample/hello/test:unittest"
]
}
}
}
```
bundle.json文件包含两个部分，第一部分说明该子系统的名称，component定义该子系统包含的部件，要添加一个部件，需要把该部件对应的内容添加进component中去。添加的时候需要指明该部件包含的模块sub_component，假如有提供给其它部件的接口，需要在inner_kits中说明，假如有测试用例，需要在test中说明，inner_kits与test没有也可以不添加。
3. 修改产品配置文件。
在productdefine\common\products\Hi3516DV300.json中添加对应的hello部件，直接添加到原有部件后即可。
```
"usb:usb_manager_native":{},
"applications:prebuilt_hap":{},
"applications:hello":{},
"wpa_supplicant-2.9:wpa_supplicant-2.9":{},
```
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