Uncaught Error: Class 'int' has no instance getter 'length' - dart

Question

Am I possibly creating the stream and consequently the media instance incorrectly?
Modifying googleapis_examples/drive_upload_download_console, I'm attempting to convert already stored .docx, .xlsx, etc files to their corresponding Google Drive counterpart.
The following code
import 'dart:async';
import 'dart:io';
import 'package:http/http.dart' show Client;
import 'package:googleapis/common/common.dart' show Media, DownloadOptions;
import 'package:googleapis/drive/v2.dart' as drive;
import 'package:path/path.dart' as path;
Future convertFile(drive.DriveApi api,
Client client,
String objectId) {
var completer = new Completer();
api.files.get(objectId).then((drive.File file) {
var fileName = path.basenameWithoutExtension(file.title);
var parents = file.parents;
client.readBytes(file.downloadUrl).then((bytes) {
var driveFile = new drive.File()
..title = fileName
..mimeType = 'application/vnd.google-apps.document'
..parents = parents;
api.files.insert(driveFile)
.then((driveFile){
var byteList = bytes.toList();
var stream = new Stream.fromIterable(byteList);
var media = new Media(stream, byteList.length);
api.files.update(new drive.File(), driveFile.id, uploadMedia: media)
.then((drive.File f){
stream.close().whenComplete((){
api.files.delete(objectId)
.then((_){
completer.complete(true);
print("Converted ${f.id}");
});
});
});
});
});
});
return completer.future;
}
results in the following error.
Unhandled exception:
Uncaught Error: Class 'int' has no instance getter 'length'.
NoSuchMethodError: method not found: 'length'
Receiver: 80
Arguments: []
Stack Trace:
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#1 Base64Encoder.bind.onData (package:googleapis/src/common_internal.dart:325:42)
#2 _RootZone.runUnaryGuarded (dart:async/zone.dart:1093)
#3 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#4 _IterablePendingEvents.handleNext (dart:async/stream_impl.dart:549)
#5 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:671)
#6 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#7 _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#8 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#9 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)
#0 _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:886)
#1 _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#2 _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#3 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:84)
#4 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:131)

Answer 1

The Media constructor expects a Stream<List<int>>, and your code is providing a Stream<int>. To solve this, just replace this line:
var stream = new Stream.fromIterable(byteList);
by:
var stream = new Stream.fromIterable([byteList]);