How do I use a dll in Vizard

[kpraveen]

Hi Farshizzo,
This is praveen.
I am interfacing the Arrington eye tracker with the vizard platform and try to get the gaze point in real time by importing vpx.dll from worldviz i am getting the data's.

similarly,i am trying for other features like pupil size,fixation,Blink,etc., by creating own header file c types function and the corresponding dll.
This is my program and i am getting the following error.

program:

from ctypes import *
import ViewpointCustomDLL
import viz
import os
import sys
import vpx
viz.go()

#Create arrington extension
arrington = viz.add('arrington.dle')

point = ViewpointCustomDLL.getPupilSize()

print'point'
print point

Error:

Traceback (most recent call last):
File "<string>", line 11, in <module>
File "C:\Documents and Settings\admin\Desktop\dll2\arrington5.py", line 2, in <module>
import ViewpointCustomDLL
ImportError: DLL load failed: The specified module could not be found.

kindly,help me out to clear the error and to get the data's in real time,for your information i am using windows xp 32-bit system.
Awaiting for your valuable reply soon.