Resource locked after extracting file to disk in windows

[pyjserv]

Hi, I got a problem "Process cannot access the file because it is being used by another process" when I was deleting a zip file after extracting it to disk in windows.

await extractFileToDisk('${path}.zip', '${dirPath}');
File('${path}.zip').deleteSync();

But if I use extractArchiveToDisk() and close inputStream, it works.

final inputStream = InputFileStream('${path}.zip');
final archive = ZipDecoder().decodeBuffer(inputStream);
extractArchiveToDisk(archive, '${dirPath}');
inputStream.close();
File('${path}.zip').deleteSync();

It occurs in my case, and I don't test it in a simple case.

[Zensonaton]

For anyone having the similar issue: you should not call .close() twice.

[bsutton]

I'm having a similar problem:

        final encoder = ZipFileEncoder();
        try {
          final pathToBackupFile = join(tmpDir, 'handyman-$datePart.db');
          final pathToDatabase = await DatabaseHelper().pathToDatabase();

          if (!exists(pathToDatabase)) {
            print('''
Database file not found at $pathToDatabase. No backup peformed.''');
            return BackupResult(
                pathToBackup: pathToBackupFile,
                pathToSource: '',
                success: false);
          }
          await copyDatabaseTo(pathToBackupFile, src, this);

          encoder.create(pathToZip);
          await encoder.addFile(File(pathToBackupFile));
          await encoder.close();

          //after that some of code for making the zip files
          return store(
              pathToZippedBackup: pathToZip,
              pathToDatabase: pathToBackupFile,
              version: version);
        } catch (e) {
          encoder.closeSync();
          rethrow;
        }

In my case the 'store' method throws a not implemented error on windows, the encoder.closeSync() runs and then I try to delete the directory that contains the zip file and it fails with the same error: Unable to delete the directory .dclitmp\aa1a0a1f-3748-4d7a-b545-7c214bf02a0e. Error: PathAccessException: Deletion failed, path = 'C:\Users\bsutt\AppData\Local\Temp.dclitmp\aa1a0a1f-3748-4d7a-b545-7c214bf02a0e' (OS Error: The process cannot access the file because it is being used by another process. , errno = 32) #0

I've also tried the async version of encoder.close() with an await but that made no difference.

[bsutton]

so with some more testing this does appear to be related to a double close.

I do note that this bug does appear to have been fixed in the 4.x branch.

Any word on when 4.x will be released?

[brendan-duncan]

Yeah sorry the 4.0 release is taking so long, I should really just push that out. There was a performance regression I wanted to sort out, but haven't had much time to work on the dart stuff recently.