FileOutputStream class

A file output stream is an output stream for writing data to a File or to a file descriptor.

FileOutputStream is meant for writing streams of raw bytes such as image data. For writing streams of characters, consider using FileWriter.

Example Usage

// Writing binary data
final output = FileOutputStream('output.bin');
try {
  final data = Uint8List.fromList([0x89, 0x50, 0x4E, 0x47]); // PNG header
  await output.writeBytes(data);
  await output.flush();
} finally {
  await output.close();
}

// Appending to existing file
final output = FileOutputStream('log.txt', append: true);
try {
  await output.writeString('New log entry\n');
  await output.flush();
} finally {
  await output.close();
}