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未验证 提交 acc64a6f 编写于 作者: O openharmony_ci 提交者： Gitee
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!24043 [翻译完成】#I7WEXJ 

Merge pull request !24043 from Annie_wang/PR22904
上级 31e2ccf2 96e24f93
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en/application-dev/file-management/app-file-access.md
浏览文件 @ acc64a6f
......@@ -36,7 +36,7 @@ You can use [ohos.file.fs](../reference/apis/js-apis-file-fs.md) to implement ac
First, obtain the [application file path](../application-models/application-context-stage.md#obtaining-application-file-paths). The following example shows how to obtain a HAP file path using **UIAbilityContext**. For details about how to obtain **UIAbilityContext**, see [Obtaining the Context of UIAbility](../application-models/uiability-usage.md#obtaining-the-context-of-uiability).
Then, perform common file operations.
Then, perform file operations.
### Creating, Reading, and Writing a File
......@@ -46,21 +46,29 @@ The following example demonstrates how to create a file, read data from it, and
// pages/xxx.ets
import fs from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
import buffer from '@ohos.buffer';
function createFile() {
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
function createFile() {
// Create a file and open it.
let file = fs.openSync(filesDir + '/test.txt', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
// Write data to the file.
let writeLen = fs.writeSync(file.fd, "Try to write str.");
console.info("The length of str is: " + writeLen);
// Read data from the file.
let buf = new ArrayBuffer(1024);
let readLen = fs.readSync(file.fd, buf, { offset: 0 });
console.info("the content of file: " + String.fromCharCode.apply(null, new Uint8Array(buf.slice(0, readLen))));
let arrayBuffer = new ArrayBuffer(1024);
class Option {
public offset: number = 0;
public length: number;
}
let option = new Option();
option.length = arrayBuffer.byteLength;
let readLen = fs.readSync(file.fd, arrayBuffer, option);
let buf = buffer.from(arrayBuffer, 0, readLen);
console.info("the content of file: " + buf.toString());
// Close the file.
fs.closeSync(file);
}
......@@ -75,11 +83,11 @@ function createFile() {
import fs from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
function readWriteFile() {
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
function readWriteFile() {
// Open the source and destination files.
let srcFile = fs.openSync(filesDir + '/test.txt', fs.OpenMode.READ_WRITE);
let destFile = fs.openSync(filesDir + '/destFile.txt', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
......@@ -87,11 +95,18 @@ function readWriteFile() {
let bufSize = 4096;
let readSize = 0;
let buf = new ArrayBuffer(bufSize);
let readLen = fs.readSync(srcFile.fd, buf, { offset: readSize });
class Option {
public offset: number = 0;
public length: number = bufSize;
}
let option = new Option();
option.offset = readSize;
let readLen = fs.readSync(srcFile.fd, buf, option);
while (readLen > 0) {
readSize += readLen;
fs.writeSync(destFile.fd, buf);
readLen = fs.readSync(srcFile.fd, buf, { offset: readSize });
option.offset = readSize;
readLen = fs.readSync(srcFile.fd, buf, option);
}
// Close the files.
fs.closeSync(srcFile);
......@@ -112,11 +127,11 @@ The following example demonstrates how to read and write file data using a strea
import fs from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
async function readWriteFileWithStream() {
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
async function readWriteFileWithStream() {
// Open the file streams.
let inputStream = fs.createStreamSync(filesDir + '/test.txt', 'r+');
let outputStream = fs.createStreamSync(filesDir + '/destFile.txt', "w+");
......@@ -124,11 +139,18 @@ async function readWriteFileWithStream() {
let bufSize = 4096;
let readSize = 0;
let buf = new ArrayBuffer(bufSize);
let readLen = await inputStream.read(buf, { offset: readSize });
class Option {
public offset: number = 0;
public length: number = bufSize;
}
let option = new Option();
option.offset = readSize;
let readLen = await inputStream.read(buf, option);
readSize += readLen;
while (readLen > 0) {
await outputStream.write(buf);
readLen = await inputStream.read(buf, { offset: readSize });
option.offset = readSize;
readLen = await inputStream.read(buf, option);
readSize += readLen;
}
// Close the streams.
......@@ -148,8 +170,7 @@ async function readWriteFileWithStream() {
The following example demonstrates how to list files that meet the specified conditions.
```ts
// List files.
import fs from '@ohos.file.fs';
import fs, { Filter } from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
// Obtain the application file path.
......@@ -157,18 +178,20 @@ let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
// List files that meet the specified conditions.
let options = {
recursion: false,
listNum: 0,
filter: {
suffix: ['.png', '.jpg', '.txt'], // The filename extension can be '.png', '.jpg', or '.txt'.
displayName: ['test%'], // The filename starts with 'test'.
fileSizeOver: 0, // The file size is greater than or equal to 0.
lastModifiedAfter: new Date(0).getTime(), // The latest modification time of the file is later than January 1, 1970.
},
}
let files = fs.listFileSync(filesDir, options);
for (let i = 0; i < files.length; i++) {
function getListFile() {
class ListFileOption {
public recursion: boolean = false;
public listNum: number = 0;
public filter: Filter
}
let option = new ListFileOption();
option.filter.suffix = ['.png', '.jpg', '.txt']; // The filen ame extension can be '.png', '.jpg', or '.txt'.
option.filter.displayName = ['test%']; // The file name starts with 'test'.
option.filter.fileSizeOver = 0; // The file size is greater than or equal to 0.
option.filter.lastModifiedAfter = new Date(0).getTime(); // The latest modification time of the file is later than January 1, 1970.
let files = fs.listFileSync(filesDir, option);
for (let i = 0; i < files.length; i++) {
console.info(`The name of file: ${files[i]}`);
}
}
```
en/application-dev/file-management/app-file-backup.md
浏览文件 @ acc64a6f
......@@ -32,17 +32,25 @@ The capability file of an application contains the device type, device version,
Use **backup.getLocalCapabilities()** to obtain capability files.
```js
```ts
import backup from '@ohos.file.backup';
import common from '@ohos.app.ability.common';
import fs from '@ohos.file.fs';
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
async function getLocalCapabilities() {
try {
let fileData = await backup.getLocalCapabilities();
console.info('getLocalCapabilities success');
let fpath = await globalThis.context.filesDir + '/localCapabilities.json';
let fpath = filesDir + '/localCapabilities.json';
fs.copyFileSync(fileData.fd, fpath);
fs.closeSync(fileData.fd);
} catch (err) {
console.error('getLocalCapabilities failed with err: ' + err);
} catch (error) {
let err: BusinessError = error as BusinessError;
console.error('getLocalCapabilities failed with err: ' + JSON.stringify(err));
}
}
```
......@@ -88,17 +96,24 @@ You can save the file to a local directory as required.
**Example**
```ts
import backup from '@ohos.file.backup';
import common from '@ohos.app.ability.common';
import fs from '@ohos.file.fs';
import { BusinessError } from '@ohos.base';
// Obtain the sandbox path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
// Create a SessionBackup instance for data backup.
let g_session;
let g_session: backup.SessionBackup;
function createSessionBackup() {
let sessionBackup = new backup.SessionBackup({
onFileReady: async (err, file) => {
let generalCallbacks: backup.GeneralCallbacks = {
onFileReady: (err: BusinessError, file: backup.File) => {
if (err) {
console.info('onFileReady err: ' + err);
console.info('onFileReady err: ' + JSON.stringify(err));
}
try {
let bundlePath = await globalThis.context.filesDir + '/' + file.bundleName;
let bundlePath = filesDir + '/' + file.bundleName;
if (!fs.accessSync(bundlePath)) {
fs.mkdirSync(bundlePath);
}
......@@ -109,23 +124,23 @@ You can save the file to a local directory as required.
console.error('onFileReady failed with err: ' + e);
}
},
onBundleBegin: (err, bundleName) => {
onBundleBegin: (err: BusinessError, bundleName: string) => {
if (err) {
console.info('onBundleBegin err: ' + err);
console.info('onBundleBegin err: ' + JSON.stringify(err));
} else {
console.info('onBundleBegin bundleName: ' + bundleName);
}
},
onBundleEnd: (err, bundleName) => {
onBundleEnd: (err: BusinessError, bundleName: string) => {
if (err) {
console.info('onBundleEnd err: ' + err);
console.info('onBundleEnd err: ' + JSON.stringify(err));
} else {
console.info('onBundleEnd bundleName: ' + bundleName);
}
},
onAllBundlesEnd: (err) => {
onAllBundlesEnd: (err: BusinessError) => {
if (err) {
console.info('onAllBundlesEnd err: ' + err);
console.info('onAllBundlesEnd err: ' + JSON.stringify(err));
} else {
console.info('onAllBundlesEnd');
}
......@@ -133,16 +148,16 @@ You can save the file to a local directory as required.
onBackupServiceDied: () => {
console.info('onBackupServiceDied');
},
});
}
let sessionBackup = new backup.SessionBackup(generalCallbacks);
return sessionBackup;
}
async function sessionBackup ()
{
async function sessionBackup () {
g_session = createSessionBackup();
// Select the application to be backed up based on the capability file obtained by backup.getLocalCapabilities().
// You can also back up data based on the application bundle name.
const backupApps = [
const backupApps: string[] = [
"com.example.hiworld",
]
await g_session.appendBundles(backupApps);
......@@ -161,24 +176,26 @@ When all the data of the application is ready, the service starts to restore the
**Example**
```ts
import backup from '@ohos.file.backup';
import fs from '@ohos.file.fs';
import { BusinessError } from '@ohos.base';
// Create a SessionRestore instance for data restoration.
let g_session;
async function publishFile(file)
{
await g_session.publishFile({
let g_session: backup.SessionRestore;
async function publishFile(file: backup.File) {
let fileMeta: backup.FileMeta = {
bundleName: file.bundleName,
uri: file.uri
});
}
await g_session.publishFile(fileMeta);
}
function createSessionRestore() {
let sessionRestore = new backup.SessionRestore({
onFileReady: (err, file) => {
let generalCallbacks: backup.GeneralCallbacks = {
onFileReady: (err: BusinessError, file: backup.File) => {
if (err) {
console.info('onFileReady err: ' + err);
console.info('onFileReady err: ' + JSON.stringify(err));
}
// Set bundlePath based on the actual situation.
let bundlePath;
let bundlePath: string;
if (!fs.accessSync(bundlePath)) {
console.info('onFileReady bundlePath err : ' + bundlePath);
}
......@@ -188,52 +205,51 @@ When all the data of the application is ready, the service starts to restore the
publishFile(file);
console.info('onFileReady success');
},
onBundleBegin: (err, bundleName) => {
onBundleBegin: (err: BusinessError, bundleName: string) => {
if (err) {
console.error('onBundleBegin failed with err: ' + err);
console.error('onBundleBegin failed with err: ' + JSON.stringify(err));
}
console.info('onBundleBegin success');
},
onBundleEnd: (err, bundleName) => {
onBundleEnd: (err: BusinessError, bundleName: string) => {
if (err) {
console.error('onBundleEnd failed with err: ' + err);
console.error('onBundleEnd failed with err: ' + JSON.stringify(err));
}
console.info('onBundleEnd success');
},
onAllBundlesEnd: (err) => {
onAllBundlesEnd: (err: BusinessError) => {
if (err) {
console.error('onAllBundlesEnd failed with err: ' + err);
console.error('onAllBundlesEnd failed with err: ' + JSON.stringify(err));
}
console.info('onAllBundlesEnd success');
},
onBackupServiceDied: () => {
console.info('service died');
}
});
}
let sessionRestore = new backup.SessionRestore(generalCallbacks);
return sessionRestore;
}
async function restore ()
{
async function restore01 () {
g_session = createSessionRestore();
const backupApps = [
const restoreApps: string[] = [
"com.example.hiworld",
]
// You can obtain the capability file based on actual situation. The following is an example only.
// You can also construct capability files as required.
let fileData = await backup.getLocalCapabilities();
await g_session.appendBundles(fileData.fd, backupApps);
await g_session.appendBundles(fileData.fd, restoreApps);
console.info('appendBundles success');
// After the applications to be restored are added, call getFileHandle() to obtain the handles of the application files to be restored based on the application name.
// The number of application data files to be restored varies depending on the number of backup files. The following is only an example.
await g_session.getFileHandle({
let handle: backup.FileMeta = {
bundleName: restoreApps[0],
uri: "manage.json"
});
await g_session.getFileHandle({
bundleName: restoreApps[0],
uri: "1.tar"
});
}
await g_session.getFileHandle(handle);
handle.uri = "1.tar";
await g_session.getFileHandle(handle);
console.info('getFileHandle success');
}
```
......@@ -249,23 +265,30 @@ If the application has not been installed, you can install the application and t
**Example**
```ts
import backup from '@ohos.file.backup';
import common from '@ohos.app.ability.common';
import fs from '@ohos.file.fs';
import { BusinessError } from '@ohos.base';
// Obtain the sandbox path.
let context = getContext(this) as common.UIAbilityContext;
let filesDir = context.filesDir;
// Create a SessionRestore instance for data restoration.
let g_session;
async function publishFile(file)
{
await g_session.publishFile({
let g_session: backup.SessionRestore;
async function publishFile(file: backup.File) {
let fileMeta: backup.FileMeta = {
bundleName: file.bundleName,
uri: file.uri
});
}
await g_session.publishFile(fileMeta);
}
function createSessionRestore() {
let sessionRestore = new backup.SessionRestore({
onFileReady: (err, file) => {
let generalCallbacks: backup.GeneralCallbacks = {
onFileReady: (err: BusinessError, file: backup.File) => {
if (err) {
console.info('onFileReady err: ' + err);
console.info('onFileReady err: ' + JSON.stringify(err));
}
let bundlePath;
let bundlePath: string;
if( file.uri == "/data/storage/el2/restore/bundle.hap" )
{
// Set the path of the application installation package based on actual situation.
......@@ -281,61 +304,57 @@ If the application has not been installed, you can install the application and t
publishFile(file);
console.info('onFileReady success');
},
onBundleBegin: (err, bundleName) => {
onBundleBegin: (err: BusinessError, bundleName: string) => {
if (err) {
console.error('onBundleBegin failed with err: ' + err);
console.error('onBundleBegin failed with err: ' + JSON.stringify(err));
}
console.info('onBundleBegin success');
},
onBundleEnd: (err, bundleName) => {
onBundleEnd: (err: BusinessError, bundleName: string) => {
if (err) {
console.error('onBundleEnd failed with err: ' + err);
console.error('onBundleEnd failed with err: ' + JSON.stringify(err));
}
console.info('onBundleEnd success');
},
onAllBundlesEnd: (err) => {
onAllBundlesEnd: (err: BusinessError) => {
if (err) {
console.error('onAllBundlesEnd failed with err: ' + err);
console.error('onAllBundlesEnd failed with err: ' + JSON.stringify(err));
}
console.info('onAllBundlesEnd success');
},
onBackupServiceDied: () => {
console.info('service died');
}
});
}
let sessionRestore = new backup.SessionRestore(generalCallbacks);
return sessionRestore;
}
async function restore ()
{
async function restore02 () {
g_session = createSessionRestore();
const backupApps = [
const restoreApps: string[] = [
"com.example.hiworld",
]
let fpath = await globalThis.context.filesDir + '/localCapabilities.json';
let file = fs.openSync(fpath, fileIO.OpenMode.CREATE | fileIO.OpenMode.READ_WRITE);
let fpath = filesDir + '/localCapabilities.json';
let file = fs.openSync(fpath, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE);
let content = "{\"bundleInfos\" :[{\"allToBackup\" : false,\"extensionName\" : \"\"," +
"\"name\" : \"cn.openharmony.inputmethodchoosedialog\",\"needToInstall\" : true,\"spaceOccupied\" : 0," +
"\"versionCode\" : 1000000,\"versionName\" : \"1.0.0\"}],\"deviceType\" : \"default\",\"systemFullName\" : \"OpenHarmony-4.0.6.2(Canary1)\"}";
fs.writeSync(file.fd, content);
fs.fsyncSync(file.fd);
await g_session.appendBundles(file.fd, backupApps);
await g_session.appendBundles(file.fd, restoreApps);
console.info('appendBundles success');
// Obtain the file handle of the application to be installed.
await g_session.getFileHandle({
let handle: backup.FileMeta = {
bundleName: restoreApps[0],
uri: "/data/storage/el2/restore/bundle.hap"
});
await g_session.getFileHandle({
bundleName: restoreApps[0],
uri: "manage.json"
});
await g_session.getFileHandle({
bundleName: restoreApps[0],
uri: "1.tar"
});
}
await g_session.getFileHandle(handle);
handle.uri = "manage.json";
await g_session.getFileHandle(handle);
handle.uri = "1.tar";
await g_session.getFileHandle(handle);
console.info('getFileHandle success');
}
```
......
en/application-dev/file-management/app-file-upload-download.md
浏览文件 @ acc64a6f
......@@ -19,6 +19,7 @@ The following example demonstrates how to upload a file in the **cache** directo
import common from '@ohos.app.ability.common';
import fs from '@ohos.file.fs';
import request from '@ohos.request';
import { BusinessError } from '@ohos.base';
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
......@@ -30,32 +31,36 @@ fs.writeSync(file.fd, 'upload file test');
fs.closeSync(file);
// Configure the upload task.
let uploadConfig = {
let header = new Map<Object, string>();
header.set('key1', 'value1');
header.set('key2', 'value2');
let files: Array<request.File> = [
{ filename: 'test.txt', name: 'test', uri: 'internal://cache/test.txt', type: 'txt' }
]
let data: Array<request.RequestData> = [{ name: 'name', value: 'value' }];
let uploadConfig: request.UploadConfig = {
url: 'https://xxx',
header: { key1: 'value1', key2: 'value2' },
header: header,
method: 'POST',
files: [
{ filename: 'test.txt', name: 'test', uri: 'internal://cache/test.txt', type: 'txt' }
],
data: [
{ name: 'name', value: 'value' }
]
files: files,
data: data
}
// Upload the created application file to the network server.
try {
request.uploadFile(context, uploadConfig)
.then((uploadTask) => {
uploadTask.on('complete', (taskStates) => {
.then((uploadTask: request.UploadTask) => {
uploadTask.on('complete', (taskStates: Array<request.TaskState>) => {
for (let i = 0; i < taskStates.length; i++) {
console.info(`upload complete taskState: ${JSON.stringify(taskStates[i])}`);
}
});
})
.catch((err) => {
.catch((err: BusinessError) => {
console.error(`Invoke uploadFile failed, code is ${err.code}, message is ${err.message}`);
})
} catch (err) {
} catch (error) {
let err: BusinessError = error as BusinessError;
console.error(`Invoke uploadFile failed, code is ${err.code}, message is ${err.message}`);
}
```
......@@ -78,6 +83,8 @@ The following example demonstrates how to download a network resource file to a
import common from '@ohos.app.ability.common';
import fs from '@ohos.file.fs';
import request from '@ohos.request';
import { BusinessError } from '@ohos.base';
import buffer from '@ohos.buffer';
// Obtain the application file path.
let context = getContext(this) as common.UIAbilityContext;
......@@ -87,19 +94,21 @@ try {
request.downloadFile(context, {
url: 'https://xxxx/xxxx.txt',
filePath: filesDir + '/xxxx.txt'
}).then((downloadTask) => {
}).then((downloadTask: request.DownloadTask) => {
downloadTask.on('complete', () => {
console.info('download complete');
let file = fs.openSync(filesDir + '/xxxx.txt', fs.OpenMode.READ_WRITE);
let buf = new ArrayBuffer(1024);
let readLen = fs.readSync(file.fd, buf);
console.info(`The content of file: ${String.fromCharCode.apply(null, new Uint8Array(buf.slice(0, readLen)))}`);
let arrayBuffer = new ArrayBuffer(1024);
let readLen = fs.readSync(file.fd, arrayBuffer);
let buf = buffer.from(arrayBuffer, 0, readLen);
console.info(`The content of file: ${buf.toString()}`);
fs.closeSync(file);
})
}).catch((err) => {
}).catch((err: BusinessError) => {
console.error(`Invoke downloadTask failed, code is ${err.code}, message is ${err.message}`);
});
} catch (err) {
} catch (error) {
let err: BusinessError = error as BusinessError;
console.error(`Invoke downloadFile failed, code is ${err.code}, message is ${err.message}`);
}
```
en/application-dev/file-management/app-fs-space-statistics.md
浏览文件 @ acc64a6f
......@@ -28,9 +28,10 @@ For details about the APIs, see [ohos.file.statvfs](../reference/apis/js-apis-fi
```ts
import statvfs from '@ohos.file.statvfs';
import { BusinessError } from '@ohos.base';
let path = "/data";
statvfs.getFreeSize(path, (err, number) => {
statvfs.getFreeSize(path, (err: BusinessError, number: number) => {
if (err) {
console.error(`Invoke getFreeSize failed, code is ${err.code}, message is ${err.message}`);
} else {
......@@ -43,8 +44,9 @@ For details about the APIs, see [ohos.file.statvfs](../reference/apis/js-apis-fi
```ts
import storageStatistics from "@ohos.file.storageStatistics";
import { BusinessError } from '@ohos.base';
storageStatistics.getCurrentBundleStats((err, bundleStats) => {
storageStatistics.getCurrentBundleStats((err: BusinessError, bundleStats: storageStatistics.BundleStats) => {
if (err) {
console.error(`Invoke getCurrentBundleStats failed, code is ${err.code}, message is ${err.message}`);
} else {
......
en/application-dev/file-management/dev-user-file-manager.md
浏览文件 @ acc64a6f
......@@ -8,46 +8,52 @@ For details about the APIs used to develop a file manager application, see [User
## How to Develop
1. Apply for permissions required.<br>
Apply for the **ohos.permission.FILE_ACCESS_MANAGER** and **ohos.permission.GET_BUNDLE_INFO_PRIVILEGED** permissions. For details, see [Applying for Permissions](../security/accesstoken-guidelines.md).
1. Apply for permissions required.
Apply for the **ohos.permission.FILE_ACCESS_MANAGER** and **ohos.permission.GET_BUNDLE_INFO_PRIVILEGED** permissions. For details, see [Applying for Permissions](../security/accesstoken-guidelines.md).
> **NOTE**
>
> **ohos.permission.FILE_ACCESS_MANAGER** allows your application to use the user file access framework APIs.
>
> **ohos.permission.GET_BUNDLE_INFO_PRIVILEGED** allows your application to obtain information about file management server applications supported by the system.
> - **ohos.permission.FILE_ACCESS_MANAGER** allows your application to use the user file access framework APIs.
>- **ohos.permission.GET_BUNDLE_INFO_PRIVILEGED** allows your application to obtain information about file management server applications supported by the system.
2. Import dependent modules.
```ts
import fileAccess from '@ohos.file.fileAccess';
import fileExtensionInfo from '@ohos.file.fileExtensionInfo';
import { Filter } from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';
```
The **fileAccess** module provides APIs for basic file operations, and the **fileExtensionInfo** module provides key structs for application development.
3. Query device information.<br>
3. Query device information.
You can obtain attributes of the devices managed by one or all file management servers in the system. You can also filter devices as required.
In the user file access framework, **RootInfo** indicates the attribute information of a device. For example, obtain **RootInfo** of all devices.
```ts
// Obtain the application context.
let context = getContext(this) as common.UIAbilityContext;
// Create a helper object for connecting to all file management servers in the system.
let fileAccessHelperAllServer = null;
createFileAccessHelper() {
let fileAccessHelperAllServer: fileAccess.FileAccessHelper;
function createFileAccessHelper() {
try { // this.context is the context passed from EntryAbility.
fileAccessHelperAllServer = fileAccess.createFileAccessHelper(this.context);
fileAccessHelperAllServer = fileAccess.createFileAccessHelper(context);
if (!fileAccessHelperAllServer) {
console.error("createFileAccessHelper interface returns an undefined object");
}
} catch (error) {
} catch (err) {
let error: BusinessError = err as BusinessError;
console.error("createFileAccessHelper failed, errCode:" + error.code + ", errMessage:" + error.message);
}
}
async getRoots() {
let rootIterator = null;
let rootInfos = [];
let isDone = false;
let rootInfos: Array<fileAccess.RootInfo> = [];
async function getRoots() {
let rootIterator: fileAccess.RootIterator;
let isDone: boolean = false;
try {
rootIterator = await fileAccessHelperAllServer.getRoots();
if (!rootIterator) {
......@@ -59,31 +65,32 @@ For details about the APIs used to develop a file manager application, see [User
console.info("next result = " + JSON.stringify(result));
isDone = result.done;
if (!isDone)
rootinfos.push(result.value);
rootInfos.push(result.value);
}
} catch (error) {
} catch (err) {
let error: BusinessError = err as BusinessError;
console.error("getRoots failed, errCode:" + error.code + ", errMessage:" + error.message);
}
}
```
4. View directories.
In the user file access framework, **FileInfo** indicates basic information about a file (directory). You can use **listfile()** to obtain a **FileIterator** object that traverses all files (directories) of the next level or use **scanfile()** to obtain a **FileIterator** object that meets the specified conditions.
Currently, **listfile()** and **scanfile()** can be called by the **RootInfo** object to traverse the next-level files or filter the entire directory tree. In addition, **listfile()** and **scanfile()** can be called by the **FileInfo** object to traverse the next-level files or filter the specified directories.
```ts
// Start from the root directory.
let rootInfo = rootinfos[0];
let fileInfos = [];
let isDone = false;
let filter = {suffix: [".txt", ".jpg", ".xlsx"]}; // Set filter criteria.
let rootInfo = rootInfos[0];
let fileInfos: Array<fileAccess.FileInfo> = [];
let isDone: boolean = false;
let filter: Filter = {suffix : [".txt", ".jpg", ".xlsx"]}; // Set the filter.
try {
let fileIterator = rootInfo.listFile(); // Traverse the root directory of rootinfos[0] and return an iterator object.
// let fileIterator = rootInfo.scanFile(filter); // Filter device rootinfos[0] files that meet the specified conditions and return an iteration object.
if (!fileIterator) {
console.error("listFile interface returns an undefined object");
return;
}
while (!isDone) {
let result = fileIterator.next();
......@@ -92,35 +99,37 @@ For details about the APIs used to develop a file manager application, see [User
if (!isDone)
fileInfos.push(result.value);
}
} catch (error) {
} catch (err) {
let error: BusinessError = err as BusinessError;
console.error("listFile failed, errCode:" + error.code + ", errMessage:" + error.message);
}
// Start from the specified directory.
let fileInfoDir = fileInfos[0]; // fileInfoDir indicates information about a directory.
let subFileInfos = [];
let isDone = false;
let filter = {suffix: [".txt", ".jpg", ".xlsx"]}; // Set filter criteria.
let subFileInfos: Array<fileAccess.FileInfo> = [];
let isDone02: boolean = false;
let filter02: Filter = {suffix : [".txt", ".jpg", ".xlsx"]}; // Set the filter.
try {
let fileIterator = fileInfoDir.listFile(); // Traverse files in the specified directory and return an iterator object.
// let fileIterator = rootInfo.scanFile(filter); // Filter the files in the specified directory and return an iterator object.
// let fileIterator = rootInfo.scanFile(filter02); // Filter the files in the specified directory and return an iterator object.
if (!fileIterator) {
console.error("listFile interface returns an undefined object");
return;
}
while (!isDone) {
while (!isDone02) {
let result = fileIterator.next();
console.info("next result = " + JSON.stringify(result));
isDone = result.done;
if (!isDone)
subfileInfos.push(result.value);
isDone02 = result.done;
if (!isDone02)
subFileInfos.push(result.value);
}
} catch (error) {
} catch (err) {
let error: BusinessError = err as BusinessError;
console.error("listFile failed, errCode:" + error.code + ", errMessage:" + error.message);
}
```
5. Perform operations on files or directories.
You can integrate APIs of the user file access framework to implement user behaviors, such as deleting, renaming, creating, and moving a file (directory). The following example shows how to create a file. For details about other APIs, see [User File Access and Management](../reference/apis/js-apis-fileAccess.md).
```ts
......@@ -128,18 +137,20 @@ For details about the APIs used to develop a file manager application, see [User
// Create a file.
// sourceUri is the URI in fileinfo of the Download directory.
// You need to use the obtained URI for development.
let sourceUri = "file://media/file/6";
let displayName = "file1";
let fileUri = null;
async function creatFile() {
let sourceUri: string = "file://docs/storage/Users/currentUser/Download";
let displayName: string = "file1";
let fileUri: string;
try {
// Obtain fileAccessHelper by referring to the sample code of fileAccess.createFileAccessHelper.
fileUri = await fileAccessHelper.createFile(sourceUri, displayName);
// Obtain fileAccessHelperAllServer by referring to the sample code of fileAccess.createFileAccessHelper.
fileUri = await fileAccessHelperAllServer.createFile(sourceUri, displayName);
if (!fileUri) {
console.error("createFile return undefined object");
return;
}
console.info("createFile sucess, fileUri: " + JSON.stringify(fileUri));
} catch (error) {
} catch (err) {
let error: BusinessError = err as BusinessError;
console.error("createFile failed, errCode:" + error.code + ", errMessage:" + error.message);
};
}
```
en/application-dev/file-management/file-access-across-devices.md
浏览文件 @ acc64a6f
......@@ -8,8 +8,7 @@ For example, device A and device B are installed with the same application. Afte
1. Connect the devices to form a Super Device.
Connect the devices to a LAN, and complete authentication of the devices. The devices must have the same account number.
Connect the devices to a LAN, and complete authentication of the devices. The devices must have the same account number.
2. Implement cross-device access to the files of the same application.
Place the files in the **distributedfiles/** directory of the application sandbox to implement access from difference devices.
......@@ -18,11 +17,13 @@ Connect the devices to a LAN, and complete authentication of the devices. The de
```ts
import fs from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';
let context =...; // Obtain the UIAbilityContext information of device A.
let pathDir = context.distributedFilesDir;
let context = getContext(this) as common.UIAbilityContext; // Obtain the UIAbilityContext of device A.
let pathDir: string = context.distributedFilesDir;
// Obtain the file path of the distributed directory.
let filePath = pathDir + '/test.txt';
let filePath: string = pathDir + '/test.txt';
try {
// Create a file in the distributed directory.
......@@ -32,7 +33,8 @@ Connect the devices to a LAN, and complete authentication of the devices. The de
fs.writeSync(file.fd, 'content');
// Close the file.
fs.closeSync(file.fd);
} catch (err) {
} catch (error) {
let err: BusinessError = error as BusinessError;
console.error(`Failed to openSync / writeSync / closeSync. Code: ${err.code}, message: ${err.message}`);
}
```
......@@ -41,24 +43,33 @@ Connect the devices to a LAN, and complete authentication of the devices. The de
```ts
import fs from '@ohos.file.fs';
import common from '@ohos.app.ability.common';
import buffer from '@ohos.buffer';
import { BusinessError } from '@ohos.base';
let context =...; // Obtain the UIAbilityContext information of device B.
let pathDir = context.distributedFilesDir;
let context = getContext(this) as common.UIAbilityContext; // Obtain the UIAbilityContext of device B.
let pathDir: string = context.distributedFilesDir;
// Obtain the file path of the distributed directory.
let filePath = pathDir + '/test.txt';
let filePath: string = pathDir + '/test.txt';
try {
// Open the file in the distributed directory.
let file = fs.openSync(filePath, fs.OpenMode.READ_WRITE);
// Set the buffer for receiving the read data.
let buffer = new ArrayBuffer(4096);
let arrayBuffer = new ArrayBuffer(4096);
// Read the file. The return value is the number of read bytes.
let num = fs.readSync(file.fd, buffer, {
offset: 0
});
class Option {
public offset: number = 0;
public length: number;
}
let option = new Option();
option.length = arrayBuffer.byteLength;
let num = fs.readSync(file.fd, arrayBuffer, option);
// Print the read data.
console.info('read result: ' + String.fromCharCode.apply(null, new Uint8Array(buffer.slice(0, num))));
} catch (err) {
let buf = buffer.from(arrayBuffer, 0, num);
console.info('read result: ' + buf.toString());
} catch (error) {
let err: BusinessError = error as BusinessError;
console.error(`Failed to openSync / readSync. Code: ${err.code}, message: ${err.message}`);
}
```
en/application-dev/file-management/manage-external-storage.md
浏览文件 @ acc64a6f
......@@ -55,8 +55,11 @@ You can subscribe to broadcast events to observe the insertion and removal of ex
```ts
import CommonEvent from '@ohos.commonEventManager';
import volumeManager from '@ohos.file.volumeManager';
import { BusinessError } from '@ohos.base';
const subscribeInfo = {
let subscriber: CommonEvent.CommonEventSubscriber;
async function example() {
const subscribeInfo: CommonEvent.CommonEventSubscribeInfo = {
events: [
"usual.event.data.VOLUME_REMOVED",
"usual.event.data.VOLUME_UNMOUNTED",
......@@ -65,19 +68,20 @@ You can subscribe to broadcast events to observe the insertion and removal of ex
"usual.event.data.VOLUME_EJECT"
]
};
let subscriber = await CommonEvent.createSubscriber(subscribeInfo);
subscriber = await CommonEvent.createSubscriber(subscribeInfo);
}
```
3. Obtain volume information from the broadcast.
```ts
CommonEvent.subscribe(subscriber, function (err, data) {
CommonEvent.subscribe(subscriber, (err: BusinessError, data: CommonEvent.CommonEventData) => {
if (data.event === 'usual.event.data.VOLUME_MOUNTED') {
// Manage the volume device based on the information obtained from the broadcast.
let volId = data.parameters.id;
volumeManager.getVolumeById(volId, function(error, vol) {
let volId: string = data.parameters.id;
volumeManager.getVolumeById(volId, (error: BusinessError, vol: volumeManager.Volume) => {
if (error) {
console.error('volumeManager getVolumeById failed');
console.error('volumeManager getVolumeById failed for ' + JSON.stringify(error));
} else {
console.info('volumeManager getVolumeById successfully, the volume state is ' + vol.state);
}
......
en/application-dev/file-management/set-security-label.md
浏览文件 @ acc64a6f
......@@ -13,7 +13,7 @@ For details about the APIs, see [ohos.file.securityLabel](../reference/apis/js-a
| setSecurityLabel | Sets a security label for a file.| Method| √ | √ |
| getSecurityLabel | Obtains the security label of a file.| Method| √ | √ |
> **NOTE**
> **NOTICE**
>
> - In distributed networking, a device can view the files that do not match its security level but cannot access them.
>
......@@ -26,16 +26,18 @@ Obtain the sandbox path of a file and set the data security label. For details a
```ts
import securityLabel from '@ohos.file.securityLabel';
import { BusinessError } from '@ohos.base';
import common from '@ohos.app.ability.common';
// Obtain the sandbox path of the file.
let context =...; // Obtain UIAbilityContext information.
let context = getContext(this) as common.UIAbilityContext; // Obtain UIAbilityContext.
let pathDir = context.filesDir;
let filePath = pathDir + '/test.txt';
// Set the data level of the file to S0.
securityLabel.setSecurityLabel(filePath, 's0').then(() => {
console.info('Succeeded in setSecurityLabeling.');
}).catch((err) => {
}).catch((err: BusinessError) => {
console.error(`Failed to setSecurityLabel. Code: ${err.code}, message: ${err.message}`);
});
```
en/application-dev/file-management/share-app-file.md
浏览文件 @ acc64a6f
......@@ -12,7 +12,7 @@ You can use the related APIs to [share a file with another application](#sharing
The file URIs are in the following format:
**file**://&lt;*bundleName*&gt;/&lt;*path*&gt;
**file://**&lt;bundleName&gt;/&lt;path&gt;
- **file**: indicates a file URI.
......@@ -43,6 +43,7 @@ Before sharing application files, you need to [obtain the application file path]
```
2. Set the target application, with which you want to share the file, and grant permissions on the file.
Use [startAbility()](../reference/apis/js-apis-inner-application-uiAbilityContext.md#uiabilitycontextstartability) to share the file with the target application. You need to pass in the obtained URI in **uri** of the **want** parameter, set the type of the file to share, set **action** to **ohos.want.action.sendData**, and set the granted permission on the file in **flags**. For details, see [Want](../reference/apis/js-apis-app-ability-want.md#attributes).
> **NOTE**
......@@ -54,6 +55,8 @@ Before sharing application files, you need to [obtain the application file path]
import window from '@ohos.window';
import wantConstant from '@ohos.app.ability.wantConstant';
import UIAbility from '@ohos.app.ability.UIAbility';
import Want from '@ohos.app.ability.Want';
import { BusinessError } from '@ohos.base';
export default class EntryAbility extends UIAbility {
onWindowStageCreate(windowStage: window.WindowStage) {
......@@ -61,7 +64,7 @@ Before sharing application files, you need to [obtain the application file path]
let filePath = this.context.filesDir + '/test.txt';
// Convert the application sandbox path into a URI.
let uri = fileuri.getUriFromPath(filePath);
let want = {
let want: Want = {
// Grant the read and write permissions on the shared file to the target application.
flags: wantConstant.Flags.FLAG_AUTH_WRITE_URI_PERMISSION | wantConstant.Flags.FLAG_AUTH_READ_URI_PERMISSION,
// Set the implicit startup rule for the application that shares the file.
......@@ -73,15 +76,15 @@ Before sharing application files, you need to [obtain the application file path]
.then(() => {
console.info('Invoke getCurrentBundleStats succeeded.');
})
.catch((err) => {
.catch((err: BusinessError) => {
console.error(`Invoke startAbility failed, code is ${err.code}, message is ${err.message}`);
});
}
...
// ...
}
```
## Using Shared Files
In the [**module.json5** file](../quick-start/module-configuration-file.md) of the application, which wants to use the shared file, set **actions** to **ohos.want.action.sendData** to allow the application to receive files shared by another application and set **uris** to the type of the URI to receive. In the following example, the application receives only .txt files with **scheme** of **file**.
......@@ -120,10 +123,12 @@ After obtaining the URI of the shared file from **want**, the application can ca
```ts
// xxx.ets
import fs from '@ohos.file.fs';
import Want from '@ohos.app.ability.Want';
import { BusinessError } from '@ohos.base';
function getShareFile() {
try {
let want =...; // Obtain the want information sent from the application that shares the file.
let want: Want = ...; // Obtain the want sent from the application that shares the file.
// Obtain the uri field from the want information.
let uri = want.uri;
......@@ -135,11 +140,13 @@ function getShareFile() {
// Perform operations on the URI of the shared file as required. For example, open the URI to obtain the file object in read/write mode.
let file = fs.openSync(uri, fs.OpenMode.READ_WRITE);
console.info('open file successfully!');
} catch (error) {
} catch (err) {
let error: BusinessError = err as BusinessError;
console.error(`Invoke openSync failed, code is ${error.code}, message is ${error.message}`);
}
} catch (error) {
console.error(`Invoke openSync failed, code is ${error.code}, message is ${error.message}`);
let err: BusinessError = error as BusinessError;
console.error(`Invoke openSync failed, code is ${err.code}, message is ${err.message}`);
}
}
```
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