Unable to send a file using MultipartFile in flutter

Question

Actually my question is same with this question: How to upload images and file to a server in Flutter?, I have tried the solution there but I when I try to check the backend, the file is still null Here is the part of the code

var url = Uri.parse("$loginUrl/saving");
      var request = new http.MultipartRequest("POST", url);
      request.headers.addAll(headers);
      request.fields['start_date'] =
          "2021-10-10 14:42:09.369599"; //"$startDate";
      request.fields['end_date'] = "2021-10-10 14:41:09.369599"; // "$endDate";
      request.fields['id_download'] = "0";
File file = File(
          "/data/user/0/com.example.project/cache/file_picker/ic_launcher.png");
      Uint8List bytes = file.readAsBytesSync();
      List<int> sending = bytes;

      request.files.add(await http.MultipartFile.fromBytes(
          'file_upload', file.readAsBytesSync(),
          // contentType: new MediaType('application', 'octet-stream'),
          filename: "ic_launcher.png"));
      print(request);
      print("kkkk");
      var res = await request.send().timeout(Duration(seconds: 5));
      final respStr = await res.stream.bytesToString();

is there something that I should add more?

pass `bytes` to `fromBytes()` method, now you call `file.readAsBytesSync()` twice — pskink, Oct 10 '21 at 09:43
https://stackoverflow.com/questions/61927993/how-to-return-the-data-in-multipartrequest-in-flutter — Shahryar Rafique, Oct 10 '21 at 09:46
@pskink I don't know what you mean would you like to give an example? — wahyu, Oct 10 '21 at 09:54
@pskink I have tried this: ```request.files.add( await http.MultipartFile.fromBytes( 'file_upload', bytes, // contentType: new MediaType('application', 'x-tar'), filename: "ic_launcher.png"));``` but still get the same result — wahyu, Oct 10 '21 at 10:02
@ShahryarRafique I have tried it also and I still get null in backend — wahyu, Oct 10 '21 at 10:02
Have you tried it in the postman? If available send me the link of postman collection. I will try to resolve it. — Shahryar Rafique, Oct 10 '21 at 10:07
and are you sure that `bytes` contains valid data? what if you `print(bytes.length)`? — pskink, Oct 10 '21 at 10:11
@ShahryarRafique I have tried it in postman, and it is success but when I try it using flutter, always getting null — wahyu, Oct 10 '21 at 10:21
why not try `MultipartFile.fromPath` instead of `.fromBytes` since you have the filepath of the image anyway? — Nathan Tew, Mar 01 '22 at 07:21
I think the problem may be in the part of `http.MultipartFile.fromBytes`. I just met the similiar issue and fixed it by using `dio.MultipartFile.fromBytes` from [dio package](https://pub.dev/packages/dio) — yellowgray, Sep 08 '22 at 01:04

Unable to send a file using MultipartFile in flutter

0 Answers0