Javascript code:
var ptrA = Interop.Allocate(4);
var s = 'this is some text';
var ptrA_string = Interop.Allocate(2*s.length+2)
ptrA_string.WriteString(0, s);
ptrA.WriteDWORD(0, ptrA_string.DataPtr);
var ptrB = Interop.Allocate(4);
Interop.Call('kernel32', 'RtlMoveMemory', ptrB, ptrA, 4);
Debug.Trace(ptrB.ReadString(0));