What is the cheat for infinite ammo in Battlefield Vietnam?

just open up cheat engine and battlefield,click the computer and Windows list and find battlefield,enter the number of ammo then fire and enter the remaining ammo,you will see addresses in the left corner.If you see same numbers of ammo fire,and now check which is right when your done click two times at the address,it will apear at down,now click value

two times and enter the maximum number of the weapon, click the box under the Word frezze and then start playing.

NOTE:don't close cheat engine because u will cancel the cheat.If you don't have the cheat engine enter it in the internet and download it its simple.