msn plus script read/write memory

Question

hello, I'm writing on a MSN Plus script, which is in fact javascript.
For interop with Windows there is a class called Interop.
With its static function Call one can call s specified function in a specified dll with up to 12 arguments.
My goal is to write a script which gets a process name out of the PID.
I've done everything right, but it still doesn't work.

function GetProcNameFromPID(pid)  
{
    var hnd = Interop.Call("kernel32", "CreateToolhelp32Snapshot", 2, 0);
    var handle = Interop.Call("kernel32", "GetCurrentProcess");
    var StructP = Interop.Allocate(4+4+4+4+4+4+4+4+4+260);//*Allocate space for the ProcessEntry32 struct*
    var hnd_ptr = Interop.Allocate(4);
    var ress = Interop.Call("kernel32", "WriteProcessMemory", handle, StructP, StructP.size.DataPtr, 4, hnd_ptr);
    Debug.Trace(ReadInt(hnd_ptr, 0));
    var res = Interop.Call("kernel32", "Process32FirstW", hnd, StructP.DataPtr);
    if(!res)
    {
        Debug.Trace("FAAAAIIIILLLLL / " + Interop.Call("kernel32", "GetLastError") + " / " + ress);
    }
    else
    {
        do
        {
            var pos = 0;
            ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            var owpid = ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            var parpid = ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            ReadInt(StructP, pos);
            var name = ReadString(pos, 50);
            if(pid == owpid)
                return name;
            StructP = Interop.Allocate(4+4+4+4+4+4+4+8+4+50);
            Interop.Call("kernel32", "WriteProcessMemory", handle, StructP.DataPtr, StructP.size.DataPtr, 4, null);
        }
            while(Interop.Call("kernel32", "Process32NextW", hnd, StructP.DataPtr) == true)
    }
}
function ReadInt(buffer, pos)
{
var res = 0; 
    for(var i = 0; i >> 24;  
    var b2 = addr >> 24;  
    var b3 = addr >> 24;  
    var b4 = addr >> 24;  
    return b4 + b3*256 + b2*256*256 + b1*256*256*256;  
}  

---

The Process32FirstW function always suceeds, but the struct is empty.
The WriteProcessMemory function suceeds, too. But the number of written bytes is always 0.