| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion Future<RandomAccessFile> open({FileMode mode: FileMode.read}) |
| /// Open the file for random access operations. Returns a |
| /// Future<RandomAccessFile> that completes with the opened random access file. |
| /// RandomAccessFiles must be closed using the RandomAccessFile.close method. |
| /// |
| /// Files can be opened in three modes: |
| /// FileMode.read: open the file for reading. |
| /// FileMode.write: open the file for both reading and writing and truncate the |
| /// file to length zero. If the file does not exist the file is created. |
| /// |
| /// FileMode.append: same as FileMode.write except that the file is not |
| /// truncated. |
| /// @description Checks that this method returns a Future<RandomAccessFile> that |
| /// completes with the opened random access file. Test WRITE_ONLY_APPEND mode |
| /// @author sgrekhov@unipro.ru |
| |
| import "dart:io"; |
| import "../../../Utils/expect.dart"; |
| import "../file_utils.dart"; |
| |
| main() async { |
| await inSandbox(_main); |
| } |
| |
| _main(Directory sandbox) async { |
| File file = getTempFileSync(parent: sandbox); |
| file.writeAsBytesSync([0, 1, 2, 3, 4]); |
| asyncStart(); |
| await file.open(mode: FileMode.writeOnlyAppend).then((RandomAccessFile raFile) { |
| try { |
| Expect.equals(5, raFile.lengthSync()); |
| raFile.setPositionSync(1); |
| raFile.writeByteSync(0); |
| raFile.setPositionSync(0); |
| Expect.throws(() {raFile.readByteSync();}, |
| (e) => e is FileSystemException); |
| asyncEnd(); |
| } finally { |
| raFile.closeSync(); |
| } |
| }); |
| } |