IBufferByteAccess and the PackageSpecificToken

Question

Any ideas on getting the bytestream from PackageSpecificToken? If you do:

var deviceToken = Windows.System.Profile.HardwareIdentification.getPackageSpecificToken(null);

deviceId = deviceToken;

then DeviceId is an IBuffer. No clue how to get the bytes from it in JavaScript. Thoughts?

S

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Answer 1

See this post for IBuffer using dataReader: http://social.msdn.microsoft.com/Forums/en-US/winappswithhtml5/thread/5a8ea697-fb2e-435d-ae6c-305ab513688b

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Jeff Sanders (MSFT)

Answer 2

Say No Such Interface Supported when I try and create the DataReader.

    var deviceToken = Windows.System.Profile.HardwareIdentification.getPackageSpecificToken(null);
    var deviceBuffer = deviceToken.id; //This is an iBuffer

    var reader = new Windows.Storage.Streams.DataReader(deviceBuffer);
   reader.loadAsync(deviceBuffer.length).then(
   function (readsize) {
       var array = new Array(readsize);
       reader.readBytes(array);
   });

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Answer 3

Here you go:

    var packageSpecificToken;

            packageSpecificToken = Windows.System.Profile.HardwareIdentification.getPackageSpecificToken(null);

            // hardware id, signature, certificate IBuffer objects 
            // that can be accessed through properties.
            var hardwareId = packageSpecificToken.id;
            var signature = packageSpecificToken.signature;
            var certificate = packageSpecificToken.certificate;
            var dataReader = Windows.Storage.Streams.DataReader.fromBuffer(hardwareId);

            var array = new Array(hardwareId.length);
            dataReader.readBytes(array);

-Jeff

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Jeff Sanders (MSFT)

Answer 4

Woah, fromBuffer. That's rad. A hack, but rad. Is that even in the docs? IT IS! Who knew.

Thanks a lot, again, for the help.

S

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Answer 5

You are welcome ;-)  Thanks for the chuckle Bill!

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Jeff Sanders (MSFT)

Answer 6

This code will give you a unique id for your device, but not one unique id.

The problem with this code is that it will change if you change something with your computer.
So if you plug in a USB mouse/keyboard it will create a different id.

So if you're looking for a unique key you got it, but you can't use it to uniquely identify a computer.

- Martin

Answer 7

That is a really good tip. As it is I am just using it as part of an authentication scheme, so it just has to be stable through the login process, but you make a very valid point.

S

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