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Dart: Scalable Application Development by Ivo Balbaert, Sergey Akopkokhyants, Davy Mitchell

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Writing to a file

In this recipe, we demonstrate the three most important ways to write to a file. You can find the code in the project writing_files.

How to do it...

The three ways to write to a file are discussed as follows:

  1. First, we import the packages io and convert as shown in the following code:
    import 'dart:io';
    import 'dart:convert';
    
    void main() {
  2. We can write to a file using writeAsString as shown in the following code:
      final filename = 'outString.txt';
      new File(filename).writeAsString('Dart is an elegant language').then((File file) {
      // do something with the file.
    });
  3. We can write to a file using writeAsBytes as shown in the following code:
      final string = '你好世界';
      // Encode to UTF8.
      var encodedData = UTF8.encode(string);
      new File('outUTF8.txt').writeAsBytes(encodedData).then((file) ...

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