diff --git a/zh-cn/application-dev/reference/apis/js-apis-medialibrary.md b/zh-cn/application-dev/reference/apis/js-apis-medialibrary.md index 0b0b8964a6bafc9bb57b923b261a018194c13203..752de65c1cb3089d882ca922587c05e2455a56f7 100644 --- a/zh-cn/application-dev/reference/apis/js-apis-medialibrary.md +++ b/zh-cn/application-dev/reference/apis/js-apis-medialibrary.md @@ -1,6 +1,6 @@ # @ohos.multimedia.medialibrary (媒体库管理) -> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：** +> **说明：** > 该组件从API Version 6开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。 ## 导入模块 @@ -33,6 +33,7 @@ getMediaLibrary(context: Context): MediaLibrary **示例：（从API Version 9开始）** ```ts +// 获取mediaLibrary实例，后续用到此实例均采用此处获取的实例 const context = getContext(this); let media = mediaLibrary.getMediaLibrary(context); ``` @@ -91,46 +92,59 @@ getFileAssets(options: MediaFetchOptions, callback: AsyncCallback<FetchFileRe **示例：** ```js -let fileKeyObj = mediaLibrary.FileKey; -let imageType = mediaLibrary.MediaType.IMAGE; -let imagesFetchOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], -}; -media.getFileAssets(imagesFetchOp, (error, fetchFileResult) => { - if (fetchFileResult == undefined) { - console.error('Failed to get fetchFileResult: ' + error); - return; - } - const count = fetchFileResult.getCount(); - if (count < 0) { - console.error('Failed to get count from fetchFileResult: count: ' + count); - return; - } - if (count == 0) { - console.info('The count of fetchFileResult is zero'); - return; - } - - console.info('Get fetchFileResult success, count: ' + count); - fetchFileResult.getFirstObject((err, fileAsset) => { - if (fileAsset == undefined) { - console.error('Failed to get first object: ' + err); +async function example() { + let fileKeyObj = mediaLibrary.FileKey; + let imageType = mediaLibrary.MediaType.IMAGE; + // 创建文件获取选项，此处参数为获取image类型的文件资源 + let imagesFetchOp = { + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + }; + // 获取文件资源，使用callback方式返回异步结果 + media.getFileAssets(imagesFetchOp, (error, fetchFileResult) => { + // 判断获取的文件资源的检索结果集是否为undefined，若为undefined则接口调用失败 + if (fetchFileResult == undefined) { + console.error('get fetchFileResult failed with error: ' + error); return; } - console.info('fileAsset.displayName ' + ': ' + fileAsset.displayName); - for (let i = 1; i < count; i++) { - fetchFileResult.getNextObject((err, fileAsset) => { - if (fileAsset == undefined) { - console.error('Failed to get next object: ' + err); - return; - } - console.info('fileAsset.displayName ' + i + ': ' + fileAsset.displayName); - }) + // 获取文件检索结果集中的总数 + const count = fetchFileResult.getCount(); + // 判断结果集中的数量是否小于0，小于0时表示接口调用失败 + if (count < 0) { + console.error('get count from fetchFileResult failed, count: ' + count); + return; } + // 判断结果集中的数量是否等于0，等于0时表示接口调用成功，但是检索结果集为空，请检查文件获取选项参数配置是否有误和设备中是否存在相应文件 + if (count == 0) { + console.info('The count of fetchFileResult is zero'); + return; + } + console.info('Get fetchFileResult successfully, count: ' + count); + // 获取文件检索结果集中的第一个资源，使用callback方式返回异步结果 + fetchFileResult.getFirstObject((error, fileAsset) => { + // 检查获取的第一个资源是否为undefined，若为undefined则接口调用失败 + if (fileAsset == undefined) { + console.error('get first object failed with error: ' + error); + return; + } + console.info('fileAsset.displayName ' + '0 : ' + fileAsset.displayName); + // 调用 getNextObject 接口获取下一个资源，直到最后一个 + for (let i = 1; i < count; i++) { + fetchFileResult.getNextObject((error, fileAsset) => { + if (fileAsset == undefined) { + console.error('get next object failed with error: ' + error); + return; + } + console.info('fileAsset.displayName ' + i + ': ' + fileAsset.displayName); + }) + } + }); + // 释放FetchFileResult实例并使其失效。无法调用其他方法 + fetchFileResult.close(); }); -}); +} ``` + ### getFileAssets7+ getFileAssets(options: MediaFetchOptions): Promise<FetchFileResult> @@ -156,38 +170,51 @@ getFileAssets(options: MediaFetchOptions): Promise<FetchFileResult> **示例：** ```js -let fileKeyObj = mediaLibrary.FileKey; -let imageType = mediaLibrary.MediaType.IMAGE; -let imagesFetchOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], -}; -media.getFileAssets(imagesFetchOp).then(function(fetchFileResult) { - const count = fetchFileResult.getCount(); - if (count < 0) { - console.error('Failed to get count from fetchFileResult: count: ' + count); - return; - } - if (count == 0) { - console.info('The count of fetchFileResult is zero'); - return; - } - console.info('Get fetchFileResult success, count: ' + count); - fetchFileResult.getFirstObject().then(function(fileAsset) { - console.info('fileAsset.displayName ' + ': ' + fileAsset.displayName); - for (let i = 1; i < count; i++) { - fetchFileResult.getNextObject().then(function(fileAsset) { - console.info('fileAsset.displayName ' + ': ' + fileAsset.displayName); - }).catch(function(err) { - console.error('Failed to get next object: ' + err); - }) +async function example() { + let fileKeyObj = mediaLibrary.FileKey; + let imageType = mediaLibrary.MediaType.IMAGE; + // 创建文件获取选项，此处参数为获取image类型的文件资源 + let imagesFetchOp = { + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + }; + // 获取文件资源，使用Promise方式返回结果 + media.getFileAssets(imagesFetchOp).then((fetchFileResult) => { + // 获取文件检索结果集中的总数 + const count = fetchFileResult.getCount(); + // 判断结果集中的数量是否小于0，小于0时表示接口调用失败 + if (count < 0) { + console.error('get count from fetchFileResult failed, count: ' + count); + return; } - }).catch(function(err) { - console.error('Failed to get first object: ' + err); + // 判断结果集中的数量是否等于0，等于0时表示接口调用成功，但是检索结果集为空，请检查文件获取选项参数配置是否有误和设备中是否存在相应文件 + if (count == 0) { + console.info('The count of fetchFileResult is zero'); + return; + } + console.info('Get fetchFileResult successfully, count: ' + count); + // 获取文件检索结果集中的第一个资源，使用Promise方式返回异步结果 + fetchFileResult.getFirstObject().then((fileAsset) => { + console.info('fileAsset.displayName ' + '0 : ' + fileAsset.displayName); + // 调用 getNextObject 接口获取下一个资源，直到最后一个 + for (let i = 1; i < count; i++) { + fetchFileResult.getNextObject().then((fileAsset) => { + console.info('fileAsset.displayName ' + i + ': ' + fileAsset.displayName); + }).catch((error) => { + console.error('get next object failed with error: ' + error); + }) + } + }).catch((error) => { + // 调用getFirstObject接口失败 + console.error('get first object failed with error: ' + error); + }); + // 释放FetchFileResult实例并使其失效。无法调用其他方法 + fetchFileResult.close(); + }).catch((error) => { + // 调用getFileAssets接口失败 + console.error('get file assets failed with error: ' + error); }); -}).catch(function(err){ - console.error("Failed to get file assets: " + err); -}); +} ``` ### on8+ @@ -231,7 +258,7 @@ off(type: 'deviceChange'|'albumChange'|'imageChange'|'audioChange ```js media.off('imageChange', () => { - // stop listening success + // stop listening successfully }) ``` @@ -262,11 +289,11 @@ async function example() { let mediaType = mediaLibrary.MediaType.IMAGE; let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE; const path = await media.getPublicDirectory(DIR_IMAGE); - media.createAsset(mediaType, 'imageCallBack.jpg', path + 'myPicture/', (err, fileAsset) => { + media.createAsset(mediaType, 'imageCallBack.jpg', path + 'myPicture/', (error, fileAsset) => { if (fileAsset != undefined) { console.info('createAsset successfully, message'); } else { - console.error('createAsset failed, message = ' + err); + console.error('createAsset failed with error: ' + error); } }); } @@ -306,8 +333,8 @@ async function example() { const path = await media.getPublicDirectory(DIR_IMAGE); media.createAsset(mediaType, 'imagePromise.jpg', path + 'myPicture/').then((fileAsset) => { console.info('createAsset successfully, message = ' + JSON.stringify(fileAsset)); - }).catch((err) => { - console.error('createAsset failed, message = ' + err); + }).catch((error) => { + console.error('createAsset failed with error: ' + error); }); } ``` @@ -348,14 +375,15 @@ async function example() { const fetchFileResult = await media.getFileAssets(option); let asset = await fetchFileResult.getFirstObject(); if (asset == undefined) { - console.error('asset not exist') - return + console.error('asset not exist'); + return; } media.deleteAsset(asset.uri).then(() => { - console.info("deleteAsset successfully"); - }).catch((err) => { - console.error("deleteAsset failed with error:"+ err); + console.info('deleteAsset successfully'); + }).catch((error) => { + console.error('deleteAsset failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -390,16 +418,17 @@ async function example() { const fetchFileResult = await media.getFileAssets(option); let asset = await fetchFileResult.getFirstObject(); if (asset == undefined) { - console.error('asset not exist') - return + console.error('asset not exist'); + return; } - media.deleteAsset(asset.uri, (err) => { - if (err != undefined) { - console.info("deleteAsset successfully"); + media.deleteAsset(asset.uri, (error) => { + if (error != undefined) { + console.error('deleteAsset failed with error: ' + error); } else { - console.error("deleteAsset failed with error:"+ err); + console.info('deleteAsset successfully'); } }); + fetchFileResult.close(); } ``` @@ -422,11 +451,11 @@ getPublicDirectory(type: DirectoryType, callback: AsyncCallback<string>): ```js let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA; -media.getPublicDirectory(DIR_CAMERA, (err, dicResult) => { +media.getPublicDirectory(DIR_CAMERA, (error, dicResult) => { if (dicResult == 'Camera/') { - console.info('mediaLibraryTest : getPublicDirectory passed'); + console.info('getPublicDirectory DIR_CAMERA successfully'); } else { - console.error('mediaLibraryTest : getPublicDirectory failed'); + console.error('getPublicDirectory DIR_CAMERA failed with error: ' + error); } }); ``` @@ -456,12 +485,15 @@ getPublicDirectory(type: DirectoryType): Promise<string> ```js async function example() { let DIR_CAMERA = mediaLibrary.DirectoryType.DIR_CAMERA; - const dicResult = await media.getPublicDirectory(DIR_CAMERA); - if (dicResult == 'Camera/') { - console.info('MediaLibraryTest : getPublicDirectory'); - } else { - console.error('MediaLibraryTest : getPublicDirectory failed'); - } + media.getPublicDirectory(DIR_CAMERA).then((dicResult) => { + if (dicResult == 'Camera/') { + console.info('getPublicDirectory DIR_CAMERA successfully'); + } else { + console.error('getPublicDirectory DIR_CAMERA failed'); + } + }).catch((error) => { + console.error('getPublicDirectory failed with error: ' + error); + }); } ``` @@ -485,19 +517,19 @@ getAlbums(options: MediaFetchOptions, callback: AsyncCallback { - if (albumList != undefined) { - const album = albumList[0]; - console.info('album.albumName = ' + album.albumName); - console.info('album.count = ' + album.count); - } else { - console.error('getAlbum fail, message = ' + err); - } -}) +async function example() { + let AlbumNoArgsfetchOp = { + selections: '', + selectionArgs: [], + }; + media.getAlbums(AlbumNoArgsfetchOp, (error, albumList) => { + if (albumList != undefined) { + console.info('getAlbums successfully: ' + JSON.stringify(albumList)); + } else { + console.error('getAlbums failed with error: ' + error); + } + }) +} ``` ### getAlbums7+ @@ -525,15 +557,17 @@ getAlbums(options: MediaFetchOptions): Promise **示例：** ```js -let AlbumNoArgsfetchOp = { - selections: '', - selectionArgs: [], -}; -media.getAlbums(AlbumNoArgsfetchOp).then(function(albumList){ - console.info("getAlbums successfully:"+ JSON.stringify(albumList)); -}).catch(function(err){ - console.error("getAlbums failed with error: " + err); -}); +async function example() { + let AlbumNoArgsfetchOp = { + selections: '', + selectionArgs: [], + }; + media.getAlbums(AlbumNoArgsfetchOp).then((albumList) => { + console.info('getAlbums successfully: ' + JSON.stringify(albumList)); + }).catch((error) => { + console.error('getAlbums failed with error: ' + error); + }); +} ``` ### release8+ @@ -549,12 +583,12 @@ release(callback: AsyncCallback<void>): void | 参数名 | 类型 | 必填 | 说明 | | -------- | ------------------------- | ---- | ---------- | -| callback | AsyncCallback<void> | 是 | 回调表示成功还是失败 | +| callback | AsyncCallback<void> | 是 | 无返回值 | **示例：** ```js -media.release((err) => { +media.release(() => { // do something }); ``` @@ -601,16 +635,16 @@ storeMediaAsset(option: MediaAssetOption, callback: AsyncCallback<string>) ```js let option = { - src : "/data/storage/el2/base/haps/entry/image.png", - mimeType : "image/*", - relativePath : "Pictures/" + src : '/data/storage/el2/base/haps/entry/image.png', + mimeType : 'image/*', + relativePath : 'Pictures/' }; -mediaLibrary.getMediaLibrary().storeMediaAsset(option, (err, value) => { - if (err) { - console.error("An error occurred when storing media resources."); +mediaLibrary.getMediaLibrary().storeMediaAsset(option, (error, value) => { + if (error) { + console.error('storeMediaAsset failed with error: ' + error); return; } - console.info("Media resources stored. "); + console.info('Media resources stored. '); // Obtain the URI that stores media resources. }); ``` @@ -642,15 +676,15 @@ storeMediaAsset(option: MediaAssetOption): Promise<string> ```js let option = { - src : "/data/storage/el2/base/haps/entry/image.png", - mimeType : "image/*", - relativePath : "Pictures/" + src : '/data/storage/el2/base/haps/entry/image.png', + mimeType : 'image/*', + relativePath : 'Pictures/' }; mediaLibrary.getMediaLibrary().storeMediaAsset(option).then((value) => { - console.info("Media resources stored."); + console.info('Media resources stored.'); // Obtain the URI that stores media resources. -}).catch((err) => { - console.error("An error occurred when storing media resources."); +}).catch((error) => { + console.error('storeMediaAsset failed with error: ' + error); }); ``` @@ -669,7 +703,7 @@ startImagePreview(images: Array<string>, index: number, callback: AsyncCal | 参数名 | 类型 | 必填 | 说明 | | -------- | ------------------------- | ---- | ---------------------------------------- | -| images | Array<string> | 是 | 预览的图片URI（"https://"，"datashare://"）列表。 | +| images | Array<string> | 是 | 预览的图片URI（'https://'，'datashare://'）列表。 | | index | number | 是 | 开始显示的图片序号。 | | callback | AsyncCallback<void> | 是 | 图片预览回调，失败时返回错误信息。 | @@ -677,22 +711,22 @@ startImagePreview(images: Array<string>, index: number, callback: AsyncCal ```js let images = [ - "datashare:///media/xxxx/2", - "datashare:///media/xxxx/3" + 'datashare:///media/xxxx/2', + 'datashare:///media/xxxx/3' ]; /* 网络图片使用方式 let images = [ - "https://media.xxxx.com/image1.jpg", - "https://media.xxxx.com/image2.jpg" + 'https://media.xxxx.com/image1.jpg', + 'https://media.xxxx.com/image2.jpg' ]; */ let index = 1; -mediaLibrary.getMediaLibrary().startImagePreview(images, index, (err) => { - if (err) { - console.error("An error occurred when previewing the images."); +mediaLibrary.getMediaLibrary().startImagePreview(images, index, (error) => { + if (error) { + console.error('startImagePreview failed with error: ' + error); return; } - console.info("Succeeded in previewing the images."); + console.info('Succeeded in previewing the images.'); }); ``` @@ -711,28 +745,28 @@ startImagePreview(images: Array<string>, callback: AsyncCallback<void&g | 参数名 | 类型 | 必填 | 说明 | | -------- | ------------------------- | ---- | ---------------------------------------- | -| images | Array<string> | 是 | 预览的图片URI（"https://"，"datashare://"）列表。 | +| images | Array<string> | 是 | 预览的图片URI（'https://'，'datashare://'）列表。 | | callback | AsyncCallback<void> | 是 | 图片预览回调，失败时返回错误信息。 | **示例：** ```js let images = [ - "datashare:///media/xxxx/2", - "datashare:///media/xxxx/3" + 'datashare:///media/xxxx/2', + 'datashare:///media/xxxx/3' ]; /* 网络图片使用方式 let images = [ - "https://media.xxxx.com/image1.jpg", - "https://media.xxxx.com/image2.jpg" + 'https://media.xxxx.com/image1.jpg', + 'https://media.xxxx.com/image2.jpg' ]; */ -mediaLibrary.getMediaLibrary().startImagePreview(images, (err) => { - if (err) { - console.error("An error occurred when previewing the images."); +mediaLibrary.getMediaLibrary().startImagePreview(images, (error) => { + if (error) { + console.error('startImagePreview failed with error: ' + error); return; } - console.info("Succeeded in previewing the images."); + console.info('Succeeded in previewing the images.'); }); ``` @@ -751,7 +785,7 @@ startImagePreview(images: Array<string>, index?: number): Promise<void& | 参数名 | 类型 | 必填 | 说明 | | ------ | ------------------- | ---- | ---------------------------------------- | -| images | Array<string> | 是 | 预览的图片URI（"https://"，"datashare://"）列表。 | +| images | Array<string> | 是 | 预览的图片URI（'https://'，'datashare://'）列表。 | | index | number | 否 | 开始显示的图片序号，不选择时默认为0。 | **返回值：** @@ -764,20 +798,20 @@ startImagePreview(images: Array<string>, index?: number): Promise<void& ```js let images = [ - "datashare:///media/xxxx/2", - "datashare:///media/xxxx/3" + 'datashare:///media/xxxx/2', + 'datashare:///media/xxxx/3' ]; /* 网络图片使用方式 let images = [ - "https://media.xxxx.com/image1.jpg", - "https://media.xxxx.com/image2.jpg" + 'https://media.xxxx.com/image1.jpg', + 'https://media.xxxx.com/image2.jpg' ]; */ let index = 1; mediaLibrary.getMediaLibrary().startImagePreview(images, index).then(() => { - console.info("Succeeded in previewing the images."); -}).catch((err) => { - console.error("An error occurred when previewing the images."); + console.info('Succeeded in previewing the images.'); +}).catch((error) => { + console.error('startImagePreview failed with error: ' + error); }); ``` @@ -803,15 +837,15 @@ startMediaSelect(option: MediaSelectOption, callback: AsyncCallback<Array< ```js let option : mediaLibrary.MediaSelectOption = { - type : "media", + type : 'media', count : 2 }; -mediaLibrary.getMediaLibrary().startMediaSelect(option, (err, value) => { - if (err) { - console.error("An error occurred when selecting media resources."); +mediaLibrary.getMediaLibrary().startMediaSelect(option, (error, value) => { + if (error) { + console.error('startMediaSelect failed with error: ' + error); return; } - console.info("Media resources selected."); + console.info('Media resources selected.'); // Obtain the media selection value. }); ``` @@ -843,14 +877,14 @@ startMediaSelect(option: MediaSelectOption): Promise<Array<string>> ```js let option : mediaLibrary.MediaSelectOption = { - type : "media", + type : 'media', count : 2 }; mediaLibrary.getMediaLibrary().startMediaSelect(option).then((value) => { - console.info("Media resources selected."); + console.info('Media resources selected.'); // Obtain the media selection value. -}).catch((err) => { - console.error("An error occurred when selecting media resources."); +}).catch((error) => { + console.error('startMediaSelect failed with error: ' + error); }); ``` @@ -878,14 +912,12 @@ getActivePeers(): Promise\>; async function example() { media.getActivePeers().then((devicesInfo) => { if (devicesInfo != undefined) { - for (let i = 0; i < devicesInfo.length; i++) { - console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId); - } + console.info('get distributed info ' + JSON.stringify(devicesInfo)); } else { - console.info('get distributed info is undefined!') + console.info('get distributed info is undefined!'); } - }).catch((err) => { - console.error("get distributed info failed with error:" + err); + }).catch((error) => { + console.error('get distributed info failed with error: ' + error); }); } ``` @@ -912,15 +944,13 @@ getActivePeers(callback: AsyncCallback\>): void; ```js async function example() { - media.getActivePeers((err, devicesInfo) => { + media.getActivePeers((error, devicesInfo) => { if (devicesInfo != undefined) { - for (let i = 0; i < devicesInfo.length; i++) { - console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId); - } + console.info('get distributed info ' + JSON.stringify(devicesInfo)); } else { - console.error('get distributed fail, message = ' + err) + console.error('get distributed failed with error: ' + error); } - }) + }); } ``` @@ -949,14 +979,12 @@ getAllPeers(): Promise\>; async function example() { media.getAllPeers().then((devicesInfo) => { if (devicesInfo != undefined) { - for (let i = 0; i < devicesInfo.length; i++) { - console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId); - } + console.info('get distributed info ' + JSON.stringify(devicesInfo)); } else { - console.info('get distributed info is undefined!') + console.info('get distributed info is undefined!'); } - }).catch((err) => { - console.error("get distributed info failed with error: " + err); + }).catch((error) => { + console.error('get distributed info failed with error: ' + error); }); } ``` @@ -983,15 +1011,13 @@ getAllPeers(callback: AsyncCallback\>): void; ```js async function example() { - media.getAllPeers((err, devicesInfo) => { + media.getAllPeers((error, devicesInfo) => { if (devicesInfo != undefined) { - for (let i = 0; i < devicesInfo.length; i++) { - console.info('get distributed info ' + devicesInfo[i].deviceName + devicesInfo[i].networkId); - } + console.info('get distributed info ' + JSON.stringify(devicesInfo)); } else { - console.error('get distributed fail, message = ' + err) + console.error('get distributed failed with error: ' + error); } - }) + }); } ``` @@ -999,7 +1025,7 @@ async function example() { 提供封装文件属性的方法。 -> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：** +> **说明：** > 1. title字段默认为去掉后缀的文件名，音频和视频文件会尝试解析文件内容，部分设备写入后在触发扫描时会被还原。 > 2. orientation字段部分设备可能不支持修改，建议使用image组件的[ModifyImageProperty](js-apis-image.md#modifyimageproperty9)接口。 @@ -1052,19 +1078,23 @@ isDirectory(callback: AsyncCallback<boolean>): void ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.isDirectory((err, isDirectory) => { - // do something + asset.isDirectory((error, isDirectory) => { + if (error) { + console.error('isDirectory failed with error: ' + error); + } else { + console.info('isDirectory result:' + isDirectory); + } }); + fetchFileResult.close(); } ``` @@ -1088,21 +1118,21 @@ isDirectory():Promise<boolean> ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.isDirectory().then(function(isDirectory){ - console.info("isDirectory result:"+ isDirectory); - }).catch(function(err){ - console.error("isDirectory failed with error: " + err); + asset.isDirectory().then((isDirectory) => { + console.info('isDirectory result:' + isDirectory); + }).catch((error) => { + console.error('isDirectory failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1126,20 +1156,20 @@ commitModify(callback: AsyncCallback<void>): void ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); asset.title = 'newtitle'; asset.commitModify(() => { - console.info('commitModify success'); + console.info('commitModify successfully'); }); + fetchFileResult.close(); } ``` @@ -1163,18 +1193,18 @@ commitModify(): Promise<void> ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); asset.title = 'newtitle'; - asset.commitModify(); + await asset.commitModify(); + fetchFileResult.close(); } ``` @@ -1184,7 +1214,7 @@ open(mode: string, callback: AsyncCallback<number>): void 打开当前文件，使用callback方式返回异步结果。 -**注意**：当前写操作是互斥的操作，写操作完成后需要调用close进行释放 +**注意**：以 'w' 模式打开文件时，返回的fd无法进行读取。但由于不同文件系统实现上的差异，部分用户态文件系统在 'w' 模式打开时会允许用fd读取。若有针对fd的读写行为，建议使用 'rw' 模式打开文件。当前写操作是互斥的操作，写操作完成后需要调用close进行释放。 **需要权限**：ohos.permission.READ_MEDIA or ohos.permission.WRITE_MEDIA @@ -1204,13 +1234,13 @@ async function example() { let mediaType = mediaLibrary.MediaType.IMAGE; let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE; const path = await media.getPublicDirectory(DIR_IMAGE); - const asset = await media.createAsset(mediaType, "image00003.jpg", path); - asset.open('rw', (openError, fd) => { - if(fd > 0){ - asset.close(fd); - }else{ - console.error('File Open Failed!' + openError); - } + const asset = await media.createAsset(mediaType, 'image00003.jpg', path); + asset.open('rw', (error, fd) => { + if (fd > 0) { + asset.close(fd); + } else { + console.error('File Open failed with error: ' + error); + } }); } ``` @@ -1221,7 +1251,7 @@ open(mode: string): Promise<number> 打开当前文件，使用promise方式返回异步结果。 -**注意**：当前写操作是互斥的操作，写操作完成后需要调用close进行释放 +**注意**：以 'w' 模式打开文件时，返回的fd无法进行读取。但由于不同文件系统实现上的差异，部分用户态文件系统在 'w' 模式打开时会允许用fd读取。若有针对fd的读写行为，建议使用 'rw' 模式打开文件。当前写操作是互斥的操作，写操作完成后需要调用close进行释放。 **需要权限**：ohos.permission.READ_MEDIA or ohos.permission.WRITE_MEDIA @@ -1246,14 +1276,12 @@ async function example() { let mediaType = mediaLibrary.MediaType.IMAGE; let DIR_IMAGE = mediaLibrary.DirectoryType.DIR_IMAGE; const path = await media.getPublicDirectory(DIR_IMAGE); - const asset = await media.createAsset(mediaType, "image00003.jpg", path); - asset.open('rw') - .then((fd) => { - console.info('File fd!' + fd); - }) - .catch((err) => { - console.error('File err!' + err); - }); + const asset = await media.createAsset(mediaType, 'image00003.jpg', path); + asset.open('rw').then((fd) => { + console.info('File open fd: ' + fd); + }).catch((error) => { + console.error('File open failed with error: ' + error); + }); } ``` @@ -1278,30 +1306,28 @@ close(fd: number, callback: AsyncCallback<void>): void ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); asset.open('rw').then((fd) => { - console.info('File fd!' + fd); - asset.close(fd, (closeErr) => { - if (closeErr != undefined) { - console.error('mediaLibraryTest : close : FAIL ' + closeErr); - console.error('mediaLibraryTest : ASSET_CALLBACK : FAIL'); + console.info('File open fd: ' + fd); + asset.close(fd, (error) => { + if (error) { + console.error('asset.close failed with error: ' + error); } else { - console.info("=======asset.close success====>"); + console.info('asset.close successfully'); } }); - }) - .catch((err) => { - console.error('File err!' + err); + }).catch((error) => { + console.error('File open failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1331,31 +1357,26 @@ close(fd: number): Promise<void> ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); asset.open('rw').then((fd) => { console.info('File fd!' + fd); - asset.close(fd).then((closeErr) => { - if (closeErr != undefined) { - console.error('mediaLibraryTest : close : FAIL ' + closeErr); - console.error('mediaLibraryTest : ASSET_CALLBACK : FAIL'); - - } else { - console.info("=======asset.close success====>"); - } + asset.close(fd).then(() => { + console.info('asset.close successfully'); + }).catch((closeErr) => { + console.error('asset.close fail, closeErr: ' + closeErr); }); - }) - .catch((err) => { - console.error('File err!' + err); + }).catch((error) => { + console.error('open File failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1379,19 +1400,23 @@ getThumbnail(callback: AsyncCallback<image.PixelMap>): void ```js async function example() { - let fileKeyObj = mediaLibrary.FileKey + let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.getThumbnail((err, pixelmap) => { - console.info('mediaLibraryTest : getThumbnail Successful '+ pixelmap); + asset.getThumbnail((error, pixelmap) => { + if (error) { + console.error('mediaLibrary getThumbnail failed with error: ' + error); + } else { + console.info('mediaLibrary getThumbnail Successful, pixelmap ' + JSON.stringify(pixelmap)); + } }); + fetchFileResult.close(); } ``` @@ -1419,17 +1444,21 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let size = { width: 720, height: 720 }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.getThumbnail(size, (err, pixelmap) => { - console.info('mediaLibraryTest : getThumbnail Successful '+ pixelmap); + asset.getThumbnail(size, (error, pixelmap) => { + if (error) { + console.error('mediaLibrary getThumbnail failed with error: ' + error); + } else { + console.info('mediaLibrary getThumbnail Successful, pixelmap ' + JSON.stringify(pixelmap)); + } }); + fetchFileResult.close(); } ``` @@ -1464,19 +1493,17 @@ async function example() { let getImageOp = { selections: fileKeyObj.MEDIA_TYPE + '= ?', selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + order: fileKeyObj.DATE_ADDED + ' DESC', }; let size = { width: 720, height: 720 }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.getThumbnail(size) - .then((pixelmap) => { - console.info('mediaLibraryTest : getThumbnail Successful '+ pixelmap); - }) - .catch((err) => { - console.error('mediaLibraryTest : getThumbnail fail, err: ' + err); + asset.getThumbnail(size).then((pixelmap) => { + console.info('mediaLibrary getThumbnail Successful, pixelmap ' + JSON.stringify(pixelmap)); + }).catch((error) => { + console.error('mediaLibrary getThumbnail failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1504,16 +1531,20 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.favorite(true,function(err){ - // do something + asset.favorite(true,(error) => { + if (error) { + console.error('mediaLibrary favorite failed with error: ' + error); + } else { + console.info('mediaLibrary favorite Successful'); + } }); + fetchFileResult.close(); } ``` @@ -1546,18 +1577,18 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.favorite(true).then(function() { - console.info("favorite successfully"); - }).catch(function(err){ - console.error("favorite failed with error: " + err); + asset.favorite(true).then(() => { + console.info('mediaLibrary favorite Successful'); + }).catch((error) => { + console.error('mediaLibrary favorite failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1584,20 +1615,20 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.isFavorite((err, isFavorite) => { - if (isFavorite) { - console.info('FileAsset is favorite'); - }else{ - console.info('FileAsset is not favorite'); + asset.isFavorite((error, isFavorite) => { + if (error) { + console.error('mediaLibrary favoriisFavoritete failed with error: ' + error); + } else { + console.info('mediaLibrary isFavorite Successful, isFavorite result: ' + isFavorite); } }); + fetchFileResult.close(); } ``` @@ -1624,18 +1655,18 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.isFavorite().then(function(isFavorite){ - console.info("isFavorite result:"+ isFavorite); - }).catch(function(err){ - console.error("isFavorite failed with error: " + err); + asset.isFavorite().then((isFavorite) => { + console.info('mediaLibrary isFavorite Successful, isFavorite result: ' + isFavorite); + }).catch((error) => { + console.error('mediaLibrary favoriisFavoritete failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1665,17 +1696,20 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.trash(true, trashCallBack); - function trashCallBack(err, trash) { - console.info('mediaLibraryTest : ASSET_CALLBACK ASSET_CALLBACK trash'); - } + asset.trash(true, (error) => { + if (error) { + console.error('mediaLibrary trash failed with error: ' + error); + } else { + console.info('mediaLibrary trash Successful'); + } + }); + fetchFileResult.close(); } ``` @@ -1710,18 +1744,18 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.trash(true).then(function() { - console.info("trash successfully"); - }).catch(function(err){ - console.error("trash failed with error: " + err); + asset.trash(true).then(() => { + console.info('trash successfully'); + }).catch((error) => { + console.error('trash failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1748,20 +1782,20 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.isTrash((err, isTrash) => { - if (isTrash == undefined) { - console.error('Failed to get trash state: ' + err); - return; - } - console.info('Get trash state success: ' + isTrash); + asset.isTrash((error, isTrash) => { + if (error) { + console.error('Failed to get trash state failed with error: ' + error); + return; + } + console.info('Get trash state successfully, isTrash result: ' + isTrash); }); + fetchFileResult.close(); } ``` @@ -1788,17 +1822,18 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; const fetchFileResult = await media.getFileAssets(getImageOp); const asset = await fetchFileResult.getFirstObject(); - asset.isTrash().then(function(isTrash){ - console.info("isTrash result: " + isTrash); - }).catch(function(err){ - console.error("isTrash failed with error: " + err); + asset.isTrash().then((isTrash) => { + console.info('isTrash result: ' + isTrash); + }).catch((error) => { + console.error('isTrash failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1829,11 +1864,12 @@ async function example() { let getFileCountOneOp = { selections: fileKeyObj.MEDIA_TYPE + '= ?', selectionArgs: [fileType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getFileCountOneOp); const fetchCount = fetchFileResult.getCount(); + console.info('fetchCount result: ' + fetchCount); + fetchFileResult.close(); } ``` @@ -1858,25 +1894,22 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); const fetchCount = fetchFileResult.getCount(); - console.info('mediaLibraryTest : count:' + fetchCount); + console.info('mediaLibrary fetchFileResult.getCount, count:' + fetchCount); let fileAsset = await fetchFileResult.getFirstObject(); for (var i = 1; i < fetchCount; i++) { - fileAsset = await fetchFileResult.getNextObject(); - if(i == fetchCount - 1) { - console.info('mediaLibraryTest : isLast'); - var result = fetchFileResult.isAfterLast(); - console.info('mediaLibraryTest : isAfterLast:' + result); - console.info('mediaLibraryTest : isAfterLast end'); - fetchFileResult.close(); - } + fileAsset = await fetchFileResult.getNextObject(); + if(i == fetchCount - 1) { + var result = fetchFileResult.isAfterLast(); + console.info('mediaLibrary fileAsset isAfterLast result: ' + result); + } } + fetchFileResult.close(); } ``` @@ -1895,10 +1928,9 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); fetchFileResult.close(); @@ -1926,19 +1958,19 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getFirstObject((err, fileAsset) => { - if (err) { - console.error('Failed '); - return; - } - console.info('fileAsset.displayName : ' + fileAsset.displayName); + fetchFileResult.getFirstObject((error, fileAsset) => { + if (error) { + console.error('fetchFileResult getFirstObject failed with error: ' + error); + return; + } + console.info('getFirstObject successfully, displayName : ' + fileAsset.displayName); }) + fetchFileResult.close(); } ``` @@ -1963,17 +1995,17 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getFirstObject().then(function(fileAsset){ - console.info("getFirstObject successfully:"+ JSON.stringify(fileAsset)); - }).catch(function(err){ - console.error("getFirstObject failed with error: " + err); + fetchFileResult.getFirstObject().then((fileAsset) => { + console.info('getFirstObject successfully, displayName: ' + fileAsset.displayName); + }).catch((error) => { + console.error('getFirstObject failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -1981,7 +2013,9 @@ async function example() { getNextObject(callback: AsyncCallback<FileAsset>): void -获取文件检索结果中的下一个文件资产。此方法使用callback形式返回结果。 +获取文件检索结果中的下一个文件资产，此方法使用callback形式返回结果。 + +> **说明**： 在使用前需要先使用[getFirstObject](#getfirstobject7)接口获取第一个文件资产，然后使用[isAfterLast](#isafterlast7)确认文件检索集当前不是指向最后一个时方可使用此接口。 **系统能力**：SystemCapability.Multimedia.MediaLibrary.Core @@ -1998,20 +2032,24 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getNextObject((err, fileAsset) => { - if (err) { - console.error('Failed '); - return; - } - console.log('fileAsset.displayName : ' + fileAsset.displayName); - }) + let fileAsset = await fetchFileResult.getFirstObject(); + if (！fetchFileResult.isAfterLast) { + fetchFileResult.getNextObject((error, fileAsset) => { + if (error) { + console.error('fetchFileResult getNextObject failed with error: ' + error); + return; + } + console.log('fetchFileResult getNextObject successfully, displayName: ' + fileAsset.displayName); + }) + } + fetchFileResult.close(); } + ``` ### getNextObject7+ @@ -2020,6 +2058,8 @@ async function example() { 获取文件检索结果中的下一个文件资产。此方法使用promise方式来异步返回FileAsset。 +> **说明**： 在使用前需要先使用[getFirstObject](#getfirstobject7)接口获取第一个文件资产，然后使用[isAfterLast](#isafterlast7)确认文件检索集当前不是指向最后一个时方可使用此接口。 + **系统能力**：SystemCapability.Multimedia.MediaLibrary.Core **返回值**： @@ -2035,15 +2075,20 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - const fetchCount = fetchFileResult.getCount(); - console.info('mediaLibraryTest : count:' + fetchCount); - let fileAsset = await fetchFileResult.getNextObject(); + let fileAsset = await fetchFileResult.getFirstObject(); + if (！fetchFileResult.isAfterLast) { + fetchFileResult.getNextObject().then((fileAsset) => { + console.info('fetchFileResult getNextObject successfully, displayName: ' + fileAsset.displayName); + }).catch((error) => { + console.error('fetchFileResult getNextObject failed with error: ' + error); + }) + } + fetchFileResult.close(); } ``` @@ -2068,19 +2113,19 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getLastObject((err, fileAsset) => { - if (err) { - console.error('Failed '); - return; - } - console.info('fileAsset.displayName : ' + fileAsset.displayName); + fetchFileResult.getLastObject((error, fileAsset) => { + if (error) { + console.error('getLastObject failed with error: ' + error); + return; + } + console.info('getLastObject successfully, displayName: ' + fileAsset.displayName); }) + fetchFileResult.close(); } ``` @@ -2105,13 +2150,17 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - let lastObject = await fetchFileResult.getLastObject(); + fetchFileResult.getLastObject().then((fileAsset) => { + console.info('getLastObject successfully, displayName: ' + fileAsset.displayName); + }).catch((error) => { + console.error('getLastObject failed with error: ' + error); + }); + fetchFileResult.close(); } ``` @@ -2127,7 +2176,7 @@ getPositionObject(index: number, callback: AsyncCallback<FileAsset>): void | 参数名 | 类型 | 必填 | 说明 | | -------- | ---------------------------------------- | ---- | ------------------ | -| index | number | 是 | 要获取的文件的索引，从0开始 | +| index | number | 是 | 要获取的文件的索引，从0开始(注意该值要小于文件检索集的count值) | | callback | AsyncCallback<[FileAsset](#fileasset7)> | 是 | 异步返回FileAsset之后的回调 | **示例**： @@ -2137,19 +2186,19 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getPositionObject(0, (err, fileAsset) => { - if (err) { - console.error('Failed '); - return; - } - console.info('fileAsset.displayName : ' + fileAsset.displayName); + fetchFileResult.getPositionObject(0, (error, fileAsset) => { + if (error) { + console.error('getPositionObject failed with error: ' + error); + return; + } + console.info('getPositionObject successfully, displayName: ' + fileAsset.displayName); }) + fetchFileResult.close(); } ``` @@ -2165,7 +2214,7 @@ getPositionObject(index: number): Promise<FileAsset> | 参数名 | 类型 | 必填 | 说明 | | ----- | ------ | ---- | -------------- | -| index | number | 是 | 要获取的文件的索引，从0开始 | +| index | number | 是 | 要获取的文件的索引，从0开始(注意该值要小于文件检索集的count值) | **返回值**： @@ -2180,17 +2229,17 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getPositionObject(1) .then(function (fileAsset){ - console.info('fileAsset.displayName : ' + fileAsset.displayName); - }).catch(function (err) { - console.error("getFileAssets failed with error: " + err); + fetchFileResult.getPositionObject(0).then((fileAsset) => { + console.info('getPositionObject successfully, displayName: ' + fileAsset.displayName); + }).catch((error) => { + console.error('getPositionObject failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -2206,7 +2255,7 @@ getAllObject(callback: AsyncCallback<Array<FileAsset>>): void | 参数名 | 类型 | 必填 | 说明 | | -------- | ---------------------------------------- | ---- | -------------------- | -| callback | AsyncCallback> | 是 | 异步返回FileAsset列表之后的回调 | +| callback | AsyncCallback<Array<[FileAsset](#fileasset7)>> | 是 | 异步返回FileAsset列表之后的回调 | **示例**： @@ -2215,21 +2264,21 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - fetchFileResult.getAllObject((err, fileAsset) => { - if (err) { - console.error('Failed '); + fetchFileResult.getAllObject((error, fileAssetList) => { + if (error) { + console.error('getAllObject failed with error: ' + error); return; } for (let i = 0; i < fetchFileResult.getCount(); i++) { - console.info('fileAsset.displayName : ' + fileAsset[i].displayName); + console.info('getAllObject fileAssetList ' + i + ' displayName: ' + fileAssetList[i].displayName); } }) + fetchFileResult.close(); } ``` @@ -2245,7 +2294,7 @@ getAllObject(): Promise<Array<FileAsset>> | 类型 | 说明 | | ---------------------------------------- | --------------------- | -| Promise> | 返回FileAsset对象列表 | +| Promise<Array<[FileAsset](#fileasset7)>> | 返回FileAsset对象列表 | **示例**： @@ -2254,13 +2303,19 @@ async function example() { let fileKeyObj = mediaLibrary.FileKey; let imageType = mediaLibrary.MediaType.IMAGE; let getImageOp = { - selections: fileKeyObj.MEDIA_TYPE + '= ?', - selectionArgs: [imageType.toString()], - order: fileKeyObj.DATE_ADDED + " DESC", - extendArgs: "", + selections: fileKeyObj.MEDIA_TYPE + '= ?', + selectionArgs: [imageType.toString()], + order: fileKeyObj.DATE_ADDED + ' DESC', }; let fetchFileResult = await media.getFileAssets(getImageOp); - var data = fetchFileResult.getAllObject(); + fetchFileResult.getAllObject().then((fileAssetList) => { + for (let i = 0; i < fetchFileResult.getCount(); i++) { + console.info('getAllObject fileAssetList ' + i + ' displayName: ' + fileAssetList[i].displayName); + } + }).catch((error) => { + console.error('getAllObject failed with error: ' + error); + }); + fetchFileResult.close(); } ``` @@ -2309,12 +2364,12 @@ async function example() { const albumList = await media.getAlbums(AlbumNoArgsfetchOp); const album = albumList[0]; album.albumName = 'hello'; - album.commitModify((err) => { - if (err) { - console.error('Failed '); - return; - } - console.info('Modify successful.'); + album.commitModify((error) => { + if (error) { + console.error('commitModify failed with error: ' + error); + return; + } + console.info('commitModify successful.'); }) } ``` @@ -2346,10 +2401,10 @@ async function example() { const albumList = await media.getAlbums(AlbumNoArgsfetchOp); const album = albumList[0]; album.albumName = 'hello'; - album.commitModify().then(function() { - console.info("commitModify successfully"); - }).catch(function(err){ - console.error("commitModify failed with error: " + err); + album.commitModify().then(() => { + console.info('commitModify successfully'); + }).catch((error) => { + console.error('commitModify failed with error: ' + error); }); } ``` @@ -2380,15 +2435,22 @@ async function example() { selectionArgs: [], }; let fileNoArgsfetchOp = { - selections: '', - selectionArgs: [], + selections: '', + selectionArgs: [], } + // 获取符合检索要求的相册，返回相册列表 const albumList = await media.getAlbums(AlbumNoArgsfetchOp); const album = albumList[0]; - album.getFileAssets(fileNoArgsfetchOp, getFileAssetsCallBack); - function getFileAssetsCallBack(err, fetchFileResult) { - // do something - } + // 取到相册列表中的一个相册，获取此相册中所有符合媒体检索选项的媒体资源 + album.getFileAssets(fileNoArgsfetchOp, (error, fetchFileResult) => { + if (error) { + console.error('album getFileAssets failed with error: ' + error); + return; + } + let count = fetchFileResult.getcount(); + console.info('album getFileAssets successfully, count: ' + count); + }); + fetchFileResult.close(); } ``` @@ -2422,17 +2484,21 @@ async function example() { selections: '', selectionArgs: [], }; - let fileNoArgsfetchOp = { - selections: '', - selectionArgs: [], + let fileNoArgsfetchOp = { + selections: '', + selectionArgs: [], }; + // 获取符合检索要求的相册，返回相册列表 const albumList = await media.getAlbums(AlbumNoArgsfetchOp); const album = albumList[0]; - album.getFileAssets(fileNoArgsfetchOp).then(function(albumFetchFileResult){ - console.info("getFileAssets successfully: " + JSON.stringify(albumFetchFileResult)); - }).catch(function(err){ - console.error("getFileAssets failed with error: " + err); + // 取到相册列表中的一个相册，获取此相册中所有符合媒体检索选项的媒体资源 + album.getFileAssets(fileNoArgsfetchOp).then((albumFetchFileResult) => { + let count = fetchFileResult.getcount(); + console.info('album getFileAssets successfully, count: ' + count); + }).catch((error) => { + console.error('album getFileAssets failed with error: ' + error); }); + fetchFileResult.close(); } ``` @@ -2470,32 +2536,32 @@ async function example() { 枚举，文件关键信息。 -> ![icon-note.gif](public_sys-resources/icon-note.gif) **说明：** +> **说明：** > bucket_id字段在文件重命名或移动后可能会发生变化，开发者使用前需要重新获取。 **系统能力：** 以下各项对应的系统能力均为SystemCapability.Multimedia.MediaLibrary.Core | 名称 | 值 | 说明 | | ------------- | ------------------- | ---------------------------------------------------------- | -| ID | "file_id" | 文件编号 | -| RELATIVE_PATH | "relative_path" | 相对公共目录路径 | -| DISPLAY_NAME | "display_name" | 显示名字 | -| PARENT | "parent" | 父目录id | -| MIME_TYPE | "mime_type" | 文件扩展属性 | -| MEDIA_TYPE | "media_type" | 媒体类型 | -| SIZE | "size" | 文件大小（单位：字节） | -| DATE_ADDED | "date_added" | 添加日期（添加文件时间到1970年1月1日的秒数值） | -| DATE_MODIFIED | "date_modified" | 修改日期（修改文件时间到1970年1月1日的秒数值，修改文件名不会改变此值，当文件内容发生修改时才会更新） | -| DATE_TAKEN | "date_taken" | 拍摄日期（文件拍照时间到1970年1月1日的秒数值） | -| TITLE | "title" | 文件标题 | -| ARTIST | "artist" | 作者 | -| AUDIOALBUM | "audio_album" | 专辑 | -| DURATION | "duration" | 持续时间（单位：毫秒） | -| WIDTH | "width" | 图片宽度（单位：像素） | -| HEIGHT | "height" | 图片高度（单位：像素） | -| ORIENTATION | "orientation" | 图片显示方向，即顺时针旋转角度，如0，90，180。（单位：度） | -| ALBUM_ID | "bucket_id" | 文件所归属的相册编号 | -| ALBUM_NAME | "bucket_display_name" | 文件所归属相册名称 | +| ID | 'file_id' | 文件编号 | +| RELATIVE_PATH | 'relative_path' | 相对公共目录路径 | +| DISPLAY_NAME | 'display_name' | 显示名字 | +| PARENT | 'parent' | 父目录id | +| MIME_TYPE | 'mime_type' | 文件扩展属性(如：image/*、video/*、file/*) | +| MEDIA_TYPE | 'media_type' | 媒体类型 | +| SIZE | 'size' | 文件大小（单位：字节） | +| DATE_ADDED | 'date_added' | 添加日期（添加文件时间到1970年1月1日的秒数值） | +| DATE_MODIFIED | 'date_modified' | 修改日期（修改文件时间到1970年1月1日的秒数值，修改文件名不会改变此值，当文件内容发生修改时才会更新） | +| DATE_TAKEN | 'date_taken' | 拍摄日期（文件拍照时间到1970年1月1日的秒数值） | +| TITLE | 'title' | 文件标题 | +| ARTIST | 'artist' | 作者 | +| AUDIOALBUM | 'audio_album' | 专辑 | +| DURATION | 'duration' | 持续时间（单位：毫秒） | +| WIDTH | 'width' | 图片宽度（单位：像素） | +| HEIGHT | 'height' | 图片高度（单位：像素） | +| ORIENTATION | 'orientation' | 图片显示方向，即顺时针旋转角度，如0，90，180。（单位：度） | +| ALBUM_ID | 'bucket_id' | 文件所归属的相册编号 | +| ALBUM_NAME | 'bucket_display_name' | 文件所归属相册名称 | ## DirectoryType8+ @@ -2538,9 +2604,9 @@ async function example() { | 名称 | 类型 | 可读 | 可写 | 说明 | | ----------------------- | ------------------- | ---- | ---- | ------------------------------------------------------------ | -| selections | string | 是 | 是 | 检索条件，使用[FileKey](#filekey8)中的枚举值作为检索条件的列名。示例：
selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR ' +mediaLibrary.FileKey.MEDIA_TYPE + '= ?', | +| selections | string | 是 | 是 | 检索条件，使用[FileKey](#filekey8)中的枚举值作为检索条件的列名。示例：
selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR ' + mediaLibrary.FileKey.MEDIA_TYPE + '= ?', | | selectionArgs | Array<string> | 是 | 是 | 检索条件的值，对应selections中检索条件列的值。
示例：
selectionArgs: [mediaLibrary.MediaType.IMAGE.toString(), mediaLibrary.MediaType.VIDEO.toString()], | -| order | string | 是 | 是 | 检索结果排序方式，使用[FileKey](#filekey8)中的枚举值作为检索结果排序的列，可以用升序或降序排列。示例：
升序排列：order: mediaLibrary.FileKey.DATE_ADDED + " ASC"
降序排列：order: mediaLibrary.FileKey.DATE_ADDED + " DESC" | +| order | string | 是 | 是 | 检索结果排序方式，使用[FileKey](#filekey8)中的枚举值作为检索结果排序的列，可以用升序或降序排列。示例：
升序排列：order: mediaLibrary.FileKey.DATE_ADDED + ' ASC'
降序排列：order: mediaLibrary.FileKey.DATE_ADDED + ' DESC' | | uri8+ | string | 是 | 是 | 文件URI | | networkId8+ | string | 是 | 是 | 注册设备网络ID | | extendArgs8+ | string | 是 | 是 | 扩展的检索参数，目前没有扩展检索参数 | @@ -2584,4 +2650,3 @@ async function example() { | type | 'image' | 'video' | 'media' | 是 | 是 | 媒体类型，包括：image, video, media，当前仅支持media类型 | | count | number | 是 | 是 | 媒体选择，count = 1表示单选，count大于1表示多选。 | -