Dallastemperature.h

like to know the format specification of the deviceaddress in getResolutiion(deviceAddress)

as specified syntex map Dallastemperature

You don't get the resolution, you set it, and you do so using the declared name of the sensor, not he device address.

http://www.hacktronics.com/Tutorials/arduino-1-wire-tutorial.html

has all you need.