问使用Flutter Camera软件包，如何将照片转换为base64字符串？

EN

import 'dart:convert' as convert;

void capturePhoto() async {

  // Note: `controller` being initialized as shown in readme
  // https://pub.dev/packages/camera#example

  XFile photo = await controller.takePicture();
  List<int> photoAsBytes = await photo.readAsBytes();
  String photoAsBase64 = convert.base64Encode(photoAsBytes);
}

var image = await ImagePicker.pickImage(source: ImageSource.gallery);
    final bytes = Io.File(image.path).readAsBytesSync();
    String img64 = base64Encode(bytes);
    print (img64);