Download image from a remote dabatase

Dear sirs,

How do I download an image file from a webservice as a byte array?

I do not want to download this way, because my image is on a database as a byte array:

network.download (

         “http://www.coronalabs.com/demo/hello.png”  

         “GET”

         networkListener,

         params,

         “helloCopy.png”

         system.TemporaryDirectory

         )

Thank you.