1/* 2 * Copyright (c) 2023 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16import fs from '@ohos.file.fs'; 17import Logger from '../util/Logger'; 18 19const TAG: string = '[Crypto_Framework]'; 20const FILE_SLEEP_TIME: number = 100; 21const TEXT_MAX_READ_LEN: number = 8192; 22// filePicker和文件管理，在OH 4.0.8.2镜像版本，读取uri后，无法直接read、write文件内容，需要sleep几十ms，这里sleep100毫秒 23function sleep(time: number): Promise<number> { 24 return new Promise((resolve) => setTimeout(resolve, time)); 25} 26 27class TextFileManager { 28 public static readString: string = ''; 29 public static readResult: number = 0; 30 public static writeResult: number = 0; 31 32 async readTextFile(textFileUri: string): Promise<void> { 33 await sleep(FILE_SLEEP_TIME); 34 try { 35 // 读取 36 let file = fs.openSync(textFileUri, fs.OpenMode.READ_ONLY); 37 Logger.info(TAG, 'success, read only file ' + file.fd); 38 // 从文件读取一段内容，限制最大长度为8192 39 let buf = new ArrayBuffer(TEXT_MAX_READ_LEN); 40 try { 41 let readLen: number = fs.readSync(file.fd, buf, { offset: 0 }); 42 TextFileManager.readString = String.fromCharCode.apply(null, new Uint8Array(buf.slice(0, readLen))); 43 TextFileManager.readResult = readLen; 44 } catch (error1) { 45 Logger.error(TAG, `file read failed, ${error1.code}, ${error1.message}`); 46 } 47 fs.closeSync(file); 48 } catch (error) { 49 Logger.error(TAG, `file open failed, ${error.code}, ${error.message}`); 50 return; 51 } 52 } 53 54 async writeTextFile(textFileUri: string, textString: string): Promise<void> { 55 await sleep(FILE_SLEEP_TIME); 56 try { 57 // 读写 58 let file = fs.openSync(textFileUri, fs.OpenMode.READ_WRITE); 59 Logger.info(TAG, 'success, read write file' + file.fd); 60 try { 61 // 写入 62 let writeLen = fs.writeSync(file.fd, textString); 63 Logger.info(TAG, 'success, The length of str is: ' + writeLen); 64 TextFileManager.writeResult = writeLen; 65 } catch (error1) { 66 Logger.error(TAG, `file write failed, ${error1.code}, ${error1.message}`); 67 } 68 fs.closeSync(file); 69 } catch (error) { 70 Logger.error(TAG, `file open failed, ${error.code}, ${error.message}`); 71 return; 72 } 73 } 74 75 getString(): string { 76 return TextFileManager.readString; 77 } 78} 79 80export default new TextFileManager();