File file = File(path); not work by uses universal_io but work by uses dart:io. What I should do?

[SittiphanSittisak]

flutter doctor

[√] Flutter (Channel stable, 2.0.4, on Microsoft Windows [Version 10.0.19042.906], locale en-US)
• Flutter version 2.0.4 at C:\flutter
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• No issues found!

[Desync-o-tron]

perhaps something like
import <this_lib> as U_IO
//then use File from that like
U_IO.File(...)

[IoanSolovastru97]

Same problem here, using universal_io: 2.0.4
Error:
`Error: UnimplementedError
at Object.throw_ [as throw] (http://localhost:54985/dart_sdk.js:5041:11)
at Function.new (http://localhost:54985/packages/universal_io/src/io/sync_socket.dart.lib.js:3413:19)
at launchResume (http://localhost:54985/packages/my_resume/business/resume.dart.lib.js:19:35)
at launchResume.next ()
at runBody (http://localhost:54985/dart_sdk.js:37422:34)
at Object._async [as async] (http://localhost:54985/dart_sdk.js:37453:7)
at Object.launchResume (http://localhost:54985/packages/my_resume/business/resume.dart.lib.js:18:18)
at http://localhost:54985/packages/my_resume/components/side_menu.dart.lib.js:501:24
at ink_well._InkResponseState.new.[_handleTap] (http://localhost:54985/packages/flutter/src/material/icon_button.dart.lib.js:48455:31)
at tap.TapGestureRecognizer.new.invokeCallback (http://localhost:54985/packages/flutter/src/gestures/recognizer.dart.lib.js:183:18)
at tap.TapGestureRecognizer.new.handleTapUp (http://localhost:54985/packages/flutter/src/gestures/tap.dart.lib.js:393:40)
at tap.TapGestureRecognizer.new.[_checkUp] (http://localhost:54985/packages/flutter/src/gestures/tap.dart.lib.js:205:12)
at tap.TapGestureRecognizer.new.handlePrimaryPointer (http://localhost:54985/packages/flutter/src/gestures/tap.dart.lib.js:154:23)
at tap.TapGestureRecognizer.new.handleEvent (http://localhost:54985/packages/flutter/src/gestures/recognizer.dart.lib.js:423:16)
at pointer_router.PointerRouter.new.[_dispatch] (http://localhost:54985/packages/flutter/src/gestures/pointer_router.dart.lib.js:85:9)
at http://localhost:54985/packages/flutter/src/gestures/pointer_router.dart.lib.js:115:26
at LinkedMap.new.forEach (http://localhost:54985/dart_sdk.js:25250:11)
at pointer_router.PointerRouter.new.[_dispatchEventToRoutes] (http://localhost:54985/packages/flutter/src/gestures/pointer_router.dart.lib.js:113:29)
at pointer_router.PointerRouter.new.route (http://localhost:54985/packages/flutter/src/gestures/pointer_router.dart.lib.js:108:37)
at binding$5.WidgetsFlutterBinding.new.handleEvent (http://localhost:54985/packages/flutter/src/gestures/binding.dart.lib.js:362:26)

`

[a-wallen]

Hi I am trying to use universal_io so that I can use open_file on web. When I try to create a new file using the same procedure as other people in this thread I am getting the same unimplemented error.

[Ldev007]

After some debugging I found the following thing to be going wrong @terrier989

@pragma('vm:entry-point')
factory File(String path) {
final overrides = IOOverrides.current;
if (overrides == null) {
throw UnimplementedError();
}
return overrides.createFile(path);
}

Line no : 221-228
File name : lib/src/io/file.dart

Within this code block overrides variable is becoming null which is causing this unimplementedError to be thrown.

[naveenbharadwaj19]

Any update ? i'm facing same Error: UnimplementedError

[ekuleshov]

The main issue is that File(path) and Directory(path) APIs aren't implemented on web.

terrier989 it would be great to have some example or guidelines how those could be supported on the web