@ohos.file.statvfs (文件系统空间统计)

该模块提供文件系统相关存储信息的功能：向应用程序提供获取文件系统总字节数、空闲字节数的JS接口。

说明：

本模块首批接口从API version 9开始支持。后续版本的新增接口，采用上角标单独标记接口的起始版本。

导入模块

import { statfs } from '@kit.CoreFileKit';

statfs.getFreeSize

getFreeSize(path:string): Promise<number>

异步方法获取指定文件系统空闲字节数，以Promise形式返回结果。

系统能力：SystemCapability.FileManagement.File.FileIO

参数：

参数名	类型	必填	说明
path	string	是	需要查询的文件系统的文件路径。

返回值：

类型	说明
Promise<number>	Promise对象，返回空闲字节数。

错误码：

接口抛出错误码的详细介绍请参见基础文件IO错误码。

错误码ID	错误信息
13900002	No such file or directory.
13900004	Interrupted system call.
13900005	I/O error.
13900008	Bad file descriptor.
13900011	Out of memory.
13900012	Permission denied.
13900013	Bad address.
13900018	Not a directory.
13900030	File name too long.
13900031	Function not implemented.
13900033	Too many symbolic links encountered.
13900038	Value too large for defined data type.
13900042	Unknown error.

示例：

import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;
statfs.getFreeSize(path).then((number: number) => {
  console.info("getFreeSize succeed, Size: " + number);
}).catch((err: BusinessError) => {
  console.error("getFreeSize failed with error message: " + err.message + ", error code: " + err.code);
});

statfs.getFreeSize

getFreeSize(path:string, callback:AsyncCallback<number>): void

异步方法获取指定文件系统空闲字节数，使用callback形式返回结果。

系统能力：SystemCapability.FileManagement.File.FileIO

参数：

参数名	类型	必填	说明
path	string	是	需要查询的文件系统的文件路径。
callback	AsyncCallback<number>	是	异步获取空闲字节数之后的回调。

错误码：

接口抛出错误码的详细介绍请参见基础文件IO错误码。

错误码ID	错误信息
13900002	No such file or directory.
13900004	Interrupted system call.
13900005	I/O error.
13900008	Bad file descriptor.
13900011	Out of memory.
13900012	Permission denied.
13900013	Bad address.
13900018	Not a directory.
13900030	File name too long.
13900031	Function not implemented.
13900033	Too many symbolic links encountered.
13900038	Value too large for defined data type.
13900042	Unknown error.

示例：

import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;
statfs.getFreeSize(path, (err: BusinessError, number: number) => {
  if (err) {
    console.error("getFreeSize failed with error message: " + err.message + ", error code: " + err.code);
  } else {
    console.info("getFreeSize succeed, Size: " + number);
  }
});

statfs.getFreeSizeSync¹⁰⁺

getFreeSizeSync(path:string): number

以同步方法获取指定文件系统空闲字节数。

系统能力：SystemCapability.FileManagement.File.FileIO

参数：

参数名	类型	必填	说明
path	string	是	需要查询的文件系统的文件路径。

返回值：

类型	说明
number	返回空闲字节数。

错误码：

接口抛出错误码的详细介绍请参见基础文件IO错误码。

错误码ID	错误信息
13900002	No such file or directory.
13900004	Interrupted system call.
13900005	I/O error.
13900008	Bad file descriptor.
13900011	Out of memory.
13900012	Permission denied.
13900013	Bad address.
13900018	Not a directory.
13900030	File name too long.
13900031	Function not implemented.
13900033	Too many symbolic links encountered.
13900038	Value too large for defined data type.
13900042	Unknown error.

示例：

import { common } from '@kit.AbilityKit';

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;
let number = statfs.getFreeSizeSync(path);
console.info("getFreeSizeSync succeed, Size: " + number);

statfs.getTotalSize

getTotalSize(path: string): Promise<number>

异步方法获取指定文件系统总字节数，以Promise形式返回结果。

系统能力：SystemCapability.FileManagement.File.FileIO

参数：

参数名	类型	必填	说明
path	string	是	需要查询的文件系统的文件路径。

返回值：

类型	说明
Promise<number>	Promise对象，返回总字节数。

错误码：

接口抛出错误码的详细介绍请参见基础文件IO错误码。

错误码ID	错误信息
13900002	No such file or directory.
13900004	Interrupted system call.
13900005	I/O error.
13900008	Bad file descriptor.
13900011	Out of memory.
13900012	Permission denied.
13900013	Bad address.
13900018	Not a directory.
13900030	File name too long.
13900031	Function not implemented.
13900033	Too many symbolic links encountered.
13900038	Value too large for defined data type.
13900042	Unknown error.

示例：

import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;
statfs.getTotalSize(path).then((number: number) => {
  console.info("getTotalSize succeed, Size: " + number);
}).catch((err: BusinessError) => {
  console.error("getTotalSize failed with error message: " + err.message + ", error code: " + err.code);
});

statfs.getTotalSize

getTotalSize(path: string, callback: AsyncCallback<number>): void

异步方法获取指定文件系统总字节数，使用callback形式返回结果。

系统能力：SystemCapability.FileManagement.File.FileIO

参数：

参数名	类型	必填	说明
path	string	是	需要查询的文件系统的文件路径。
callback	AsyncCallback<number>	是	异步获取总字节数之后的回调。

错误码：

接口抛出错误码的详细介绍请参见基础文件IO错误码。

错误码ID	错误信息
13900002	No such file or directory.
13900004	Interrupted system call.
13900005	I/O error.
13900008	Bad file descriptor.
13900011	Out of memory.
13900012	Permission denied.
13900013	Bad address.
13900018	Not a directory.
13900030	File name too long.
13900031	Function not implemented.
13900033	Too many symbolic links encountered.
13900038	Value too large for defined data type.
13900042	Unknown error.

示例：

import { BusinessError } from '@kit.BasicServicesKit';
import { common } from '@kit.AbilityKit';

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;
statfs.getTotalSize(path, (err: BusinessError, number: number) => {
  if (err) {
    console.error("getTotalSize failed with error message: " + err.message + ", error code: " + err.code);
  } else {
    console.info("getTotalSize succeed, Size: " + number);
  }
});

statfs.getTotalSizeSync¹⁰⁺

getTotalSizeSync(path: string): number

以同步方法获取指定文件系统总字节数。

系统能力：SystemCapability.FileManagement.File.FileIO

参数：

参数名	类型	必填	说明
path	string	是	需要查询的文件系统的文件路径。

返回值：

类型	说明
number	返回总字节数。

错误码：

接口抛出错误码的详细介绍请参见基础文件IO错误码。

错误码ID	错误信息
13900002	No such file or directory.
13900004	Interrupted system call.
13900005	I/O error.
13900008	Bad file descriptor.
13900011	Out of memory.
13900012	Permission denied.
13900013	Bad address.
13900018	Not a directory.
13900030	File name too long.
13900031	Function not implemented.
13900033	Too many symbolic links encountered.
13900038	Value too large for defined data type.
13900042	Unknown error.

示例：

import { common } from '@kit.AbilityKit';

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
let path = context.filesDir;
let number = statfs.getTotalSizeSync(path);
console.info("getTotalSizeSync succeed, Size: " + number);