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README
Apache-2.0

项目介绍

简介

公共基础库存放OpenHarmony通用的基础组件。这些基础组件可被OpenHarmony各业务子系统及上层应用所使用。

公共基础库在不同平台上提供的能力:

  • LiteOS-M内核(Hi3861平台):KV(key value)存储、文件操作、定时器、Dump系统属性。
  • LiteOS-A内核(Hi3516、Hi3518平台):KV(key value)存储、定时器、JS API(设备查询,数据存储)、Dump系统属性。

表 1 公共基础库功能

模块

平台支持

说明

KV存储

LiteOS-M内核、LiteOS-A内核

为应用程序提供KV存储机制。

文件操作

LiteOS-M内核

提供统一的文件操作接口,屏蔽对底层不同芯片组件的差异。

定时器

LiteOS-M内核、LiteOS-A内核

提供统一的定时器操作接口,屏蔽对底层不同芯片组件的差异。

JS API

LiteOS-A内核

提供获取设备信息,数据存储的JS API。

Dump系统属性

LiteOS-M内核、LiteOS-A内核

提供dump系统属性的命令行工具。

目录

utils/native/lite/              # 公共基础库根目录
├── file                        # 文件接口实现
├── hals                        # HAL目录
│   └── file                    # 文件操作硬件抽象层头文件
├── include                     # 公共基础库对外接口文件
├── js                          # JS API目录                 
│   └── builtin
│       ├── common
│       ├── deviceinfokit       # 设备信息Kit
│       ├── filekit             # 文件Kit
│       └── kvstorekit          # KV存储Kit
├── kal                         # KAL目录
│   └── timer                   # Timer的KAL实现
├── kv_store	                # KV存储实现
│   ├── innerkits               # KV存储内部接口
│   └── src	                    # KV存储源文件
├── memory
│   └── include                 # 内存池管理接口
├── os_dump                     # Dump系统属性
└── timer_task                  # Timer实现

使用

  • KV存储

    // 存储/更新key对应数据项
    const char key1[] = "key_sample";
    const char defValue[] = "test case of key value store.";
    int ret = UtilsSetValue(key1, defValue);
    
    // 根据key获取对应数据项
    char value1[32] = {0};
    ret = UtilsGetValue(key1, value1, 32);
    
    // 删除key对应数据项
    UtilsDeleteValue(key1);
  • 文件操作

    // 打开或创建文件
    const char fileName[] = "testfile";
    int fd = UtilsFileOpen(fileName, O_RDWR_FS | O_CREAT_FS | O_TRUNC_FS, 0);
    
    // 向文件写入特定大小的数据
    const char defValue[] = "test case of file system.";
    int ret = UtilsFileWrite(fd, defValue, strlen(defValue));
    
    // 关闭文件
    UtilsFileClose(fd);
    
    // 获取文件大小
    int fileLen = 0;
    ret = UtilsFileStat(fileName, &fileLen);
    printf("file size = %d\n", fileLen);
    
    // 重新定位文件读/写偏移量
    int fd1 = UtilsFileOpen(fileName, O_RDWR_FS, 0);
    ret = UtilsFileSeek(fd1, 5, SEEK_SET_FS);
    
    // 读取特定长度的文件数据
    char buf[32] = {0};
    int readLen = UtilsFileRead(fd1, buf, 32);
    ret = UtilsFileClose(fd1);
    printf("read len = %d : buf = %s\n", readLen, buf);
    
    // 删除指定文件
    ret = UtilsFileDelete(fileName);
  • dump系统属性

    LiteOS-M内核:在串口执行如下命令,即可打印当前系统参数

    AT+SYSPARA

    LiteOS-A内核:在bin路径下执行os_dump,即可打印当前系统参数

    ./bin/os_dump syspara

涉及仓

公共基础

utils_native_lite

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