Flutter - android: Exception when convert large file (more than 1GB) to byte

Question

I'm using dart:io to convert file to bytes. with image and short video it's work. but with large file (more than 1GB) i got error

E/flutter (16030): [ERROR:flutter/shell/common/shell.cc(93)] Dart Error: NewExternalTypedData expects argument 'length' to be in the range [0..1073741823].

my code

Uint8List bytes;
          try {
            bytes = imageFile.readAsBytesSync();
            print('bytes $bytes');
            lengthInBytes = bytes.buffer.asByteData().lengthInBytes;
          } catch (e) {
            print('e $e');
          }

it's look like limit of memory. any way to solve this?

Why are you doing that? What is the use case you are trying to accomplish? — user18309290
– user18309290, Commented Aug 4, 2022 at 4:02
i'm try to get lengthInBytes to upload from phone to my api. this is a one param — anhdhq
– anhdhq, Commented Aug 4, 2022 at 4:05
You are not converting a file to bytes. You are just trying to place the bytes of a file in memory. If you only want to know file size then that is a bad idea. The File class can simply tell you the size of the file. — blackapps
– blackapps, Commented Aug 4, 2022 at 4:47

Kaushik Chandru · Accepted Answer · 2022-08-04 04:39:41Z

1

Try uploading in chunks of the file size is bigger. You can try some package like https://pub.dev/packages/chunked_uploader

ChunkedUploader chunkedUploader = ChunkedUploader(Dio(BaseOptions(
    baseUrl: 'https://example.com/api',
    headers: {'Authorization': 'Bearer'})));
try {
  Response? response = await chunkedUploader.upload(
      filePath: '/path/to/file',
      maxChunkSize: 500000,
      path: '/file',
      onUploadProgress: (progress) => print(progress));
  print(response);
} on DioError catch (e) {
  print(e);
}

It will automatically convert into chunks and upload

answered Aug 4, 2022 at 4:39

Kaushik Chandru

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11 Comments

pskink Over a year ago

there is no no need to use any non standard package: ordinary http package and MultipartFile is good enough

Kaushik Chandru Over a year ago

Only if the range is between 0..1073741823

pskink Over a year ago

what range? you mean the uploaded file size? where did you get that limit from?

Kaushik Chandru Over a year ago

In the error message mentioned by the op

pskink Over a year ago

the error says there is no enough memory to keep the whole file content, it does not come from the uploading process

|

anhdhq · Accepted Answer · 2022-08-04 07:27:41Z

0

i found a solution to get file size

imageFile.lengthSync()

it's solve my problem. readAsBytesSync make full memory

answered Aug 4, 2022 at 7:27

anhdhq

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