Flutter uint8list to file

Flutter: Convert Uint8List to File

In Flutter, you can convert a Uint8List to a File object using the dart:io library. The Uint8List represents a sequence of bytes, and you can create a File object from these bytes by writing them to a temporary file.

Here’s an example of how you can convert a Uint8List to File:

    import 'dart:io';
    import 'dart:typed_data';

    Future uint8ListToFile(Uint8List data) async {
      String tempPath = Directory.systemTemp.path;
      String tempFileName = DateTime.now().millisecondsSinceEpoch.toString();

      File tempFile = File('$tempPath/$tempFileName.tmp');
      await tempFile.writeAsBytes(data);

      return tempFile;
    }
  

In the code above, we define a function uint8ListToFile that takes a Uint8List data as a parameter. We retrieve the system’s temporary directory path using Directory.systemTemp.path. We then generate a unique file name using the current timestamp in milliseconds.

We create a new File object by concatenating the temporary directory path and the file name with the “.tmp” extension. We then use the writeAsBytes method to write the bytes from the Uint8List to the temporary file.

Finally, we return the File object, which represents the converted Uint8List as a file.

Here’s an example of how you can use the uint8ListToFile function:

    Uint8List bytes = Uint8List.fromList([72, 101, 108, 108, 111, 33]);
    File file = await uint8ListToFile(bytes);
    print(file.path); // Prints the path of the created temporary file
  

In the code above, we create a Uint8List bytes with some sample data. We then call the uint8ListToFile function passing the bytes as a parameter. The function returns a File object, which we store in the file variable.

We can now access the path of the temporary file using file.path. In this example, the printed output will be the path of the created temporary file.