Question

I’m writing a JavaScript windows store app. My requirement is to read a file which is available locally and get arraybuffer or Uint8array as the response.

I tried using “Windows.Storage.FileIO.readBufferAsync(file)” but that is giving me an IBuffer object.

1. Is there an API that reads a file and gives me arraybuffer?
2. How do i convert “IBuffer” to “arraybuffer” ?

Thanks in Advance

Answer 1

You can use a DataReader, for instance:

    Windows.Storage.StorageFile.getFileFromApplicationUriAsync(new Windows.Foundation.Uri("ms-appx:///Assets/textfile.txt")).then(
        function (myFile) {
            Windows.Storage.FileIO.readBufferAsync(myFile).done(
                function (buffer) {
                    var myArray = new Uint8Array(buffer.length);

                    var dataReader = Windows.Storage.Streams.DataReader.fromBuffer(buffer);
                    dataReader.readBytes(myArray)
                    dataReader.close();
                }
            );
        }
    );