readAsBytesSync method
Synchronously reads the entire file contents as a list of bytes.
Throws a FileSystemException if the operation fails.
Implementation
Uint8List readAsBytesSync();© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-io/File/readAsBytesSync.html