Using the following codes, my WRT app can take a photo. very good!

My problem is: how to immediately obtain the number of bytes of the taken photo? for example, 69703 bytes. What command/method/property should I use?

Thank you very much for your helpful hint !!!

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function onFail(err)
{ alert("failed"); }

function onSuccess(pic_array)
{ alert("successful");
// how to obtain the number of bytes of the taken photo??? }

var so = nokia.device.load("camera");
var ret = so.startCamera(onSuccess, onFail);