loadString and Invalid UTF-8 byte

[Steepe Hare]

I have an absolutely correct text file (it can be viewed in any text editor).

Why when I use this code:

class _RulesPageState extends State<RulesPage> {
String filePath = "assets/eng_rules.txt";
String fileText = "";

readFile() async {
String text = await rootBundle.loadString(filePath);
setState(() {
fileText = text;
});
}

@override

I receive the error:

E/flutter (28342): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: FormatException: Invalid UTF-8 byte (at offset 0)

[Suzuki Tomohiro]

Q1 What happens if the content of the file is empty (file exists but is empty)?

Q2 What happens if you specify nonexistent file such as “assets/foobar.txt”?

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[Steepe Hare]

> What happens if the content of the file is empty (file exists but is empty)?

No errors

> What happens if you specify nonexistent file such as “assets/foobar.txt”?

E/flutter ( 9229): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Unable to load asset: assets/foobar.txt

[Suzuki Tomohiro]

Good. Now I think the problem is the content of the file. Can you share the file as an attachment? (You can truncate it as long as the same error occurs)

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[Steepe Hare]

I don't know why, but the file was saved as UTF-16LE.

When I saved it as UTF-8, Flutter could read it without errors.

Thank you.

[Suzuki Tomohiro]

Nice. Glad to hear you figured it out. You’re welcome.

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