harmony 鸿蒙@ohos.file.environment (Directory Environment Capability)

  • 2023-02-17
  • 浏览 (531)

@ohos.file.environment (Directory Environment Capability)

The Environment module provides APIs for obtaining the root directories of the storage and user files.

NOTE

  • The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
  • The APIs of this module are system APIs and cannot be called by third-party applications.

Modules to Import

import environment from '@ohos.file.environment';

environment.getStorageDataDir

getStorageDataDir():Promise<string>

Obtains the root directory of the storage. This API uses a promise to return the result.

System capability: SystemCapability.FileManagement.File.Environment

Return value

Type Description
Promise<string> Promise used to return the root directory of the storage.

Error codes

For details about the error codes, see File Management Error Codes. |ID |Error Message | |—————————-|———-| |202|The caller is not a system application| |13900020|Invalid argument| |13900042|Unknown error|

Example

  import { BusinessError } from '@ohos.base';
  environment.getStorageDataDir().then((path: string) => {
      console.info("getStorageDataDir successfully, Path: " + path);
  }).catch((err: BusinessError) => {
      console.info("getStorageDataDir failed with error message: " + err.message + ", error code: " + err.code);
  });

environment.getStorageDataDir

getStorageDataDir(callback:AsyncCallback<string>):void

Obtains the root directory of the storage. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.FileManagement.File.Environment

Parameters

Name Type Mandatory Description
callback AsyncCallback<string> Yes Asynchronous callback invoked to return the root directory of the storage.

Error codes

For details about the error codes, see File Management Error Codes. |ID |Error Message | |—————————-|———-| |202|The caller is not a system application| |13900020|Invalid argument| |13900042|Unknown error|

Example

  import { BusinessError } from '@ohos.base';
  environment.getStorageDataDir((err: BusinessError, path: string) => {
    if (err) {
      console.info("getStorageDataDir failed with error message: " + err.message + ", error code: " + err.code);
    } else {
      console.info("getStorageDataDir successfully, Path: " + path);
    }
  });

environment.getUserDataDir

getUserDataDir():Promise<string>

Obtains the root directory of user files. This API uses a promise to return the result.

System capability: SystemCapability.FileManagement.File.Environment

Return value

Type Description
Promise<string> Promise used to return the root directory of user files.

Error codes

For details about the error codes, see File Management Error Codes. |ID |Error Message | |—————————-|———-| |202|The caller is not a system application| |13900020|Invalid argument| |13900042|Unknown error|

Example

  import { BusinessError } from '@ohos.base';
  environment.getUserDataDir().then((path: string) => {
    console.info("getUserDataDir successfully, Path: " + path);
  }).catch((err: BusinessError) => {
    console.info("getUserDataDir failed with error message: " + err.message + ", error code: " + err.code);
  });

environment.getUserDataDir

getUserDataDir(callback:AsyncCallback<string>): void

Obtains the root directory of user files. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.FileManagement.File.Environment

Parameters

Name Type Mandatory Description
callback AsyncCallback<string> Yes Asynchronous callback used to return the root directory of user files.

Error codes

For details about the error codes, see File Management Error Codes. |ID |Error Message | |—————————-|———-| |202|The caller is not a system application| |13900020|Invalid argument| |13900042|Unknown error|

Example

  import { BusinessError } from '@ohos.base';
  environment.getUserDataDir((err: BusinessError, path: string) => {
    if (err) {
      console.info("getUserDataDir failed with error message: " + err.message + ", error code: " + err.code);
    } else {
      console.info("getUserDataDir successfully, Path: " + path);
    }
  });

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