FileOpenPicker question: How do I get a BLOB from a StorageFile?

Question

How can I get a BLOB object from a StorageFile that I've opened via the FileOpenPicker?

Other questions I could find seem outdated and mention a msWWA.createBlobFromRandomAccessStream method which doesn't seem to exist and the only file access example I could find creates a Blob URL via URL.createObjectURL and not an actual BLOB object.

Background info: I am trying to use zip.js to read a local zip file in Javascript.

Answer 1

Hi,

You can refer to:

http://code.msdn.microsoft.com/windowsapps/Blob-Sample-0e35889e

This sample demonstrates how to work with FileOpenPicker and blob. Senario 5 introduces how to create blob from stream.

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Answer 2

To spare anyone from searching through the sample the answer is to call

MSApp.createBlobFromRandomAccessStream(file.contentType, stream);

To get the opposite (a Stream from a BLOB) use this:

blob.msDetachStream();