Question

I am trying to read a file (made a simple .txt file on my desktop for that purpose) from machine using Dart on Dartium browser.

I have an input field, added a listener to it and here is how it looks:

  void _onFileSelect(event) {
    dom.File file = _fileInput.files.item(0);

    dom.FileReader reader = new dom.FileReader();
    //reader.readAsBinaryString(file);

    reader.addEventListener('load', (event) {
      print(reader.result); // This is the line I am having the problem with.
    });

    reader.readAsText(file);
  }

When I select the file, I get error:

Stack Trace: 0. Function: ‘Object.noSuchMethod’ url: ‘bootstrap’ line:717 col:3

on the line I marked using an inline-comment.

I have also set up a script to execute Dartium with the required flag:

#!/bin/sh
cd /opt/DartEditor/dart-sdk/chromium
./chrome.exe --allow-file-access-from-files $@

Can anyone give any tips where the problem could be?

P.S. I am using Ubuntu Precise x64.

Answer 1

Sorry, you can’t use the dart:io libraries in Dartium. Those libraries only work on Dart VM on the command line.

You might want to use an XMLHttpRequest to read in the file from an HTTP server.