🚀 go-pugleaf

Actually I am trying to access input port while using windows XP. This keyword "extern" has been given in the example provided by hardware provider's DLL file.The complete code is as follows.

#include <stdio.h>
#include <iostream.h>
#include "BytioXP.h" (which is manufacturer's provided header file)

void main()
extern "C"
{
short __import __stdcall InpVal(378h);
}

I admitt that i am not a expert programmer in C++ builder so i am very much confused that is this the right code to access the input port.Actually i have to interface encoder and ultrasonic sensor with PC via external interface card using C++ Builder (Parallel port of PC will be used).I have to read these signals and then have to generate graphical display.Right now my problem is how to read the input port.
PLEASE HELP
regards 
Umar Kazi
 
             ************************************
"Remy Lebeau \(TeamB\)" <gambit47@yahoo.com> wrote:
>
>"Umar" <umarkazi@yahoo.com> wrote in message
>news:3f1db2db$1@newsgroups.borland.com...
>
>>                   Extern "C"
>>                     {
>>                      all the commands to read input written in  this area
>>                     }
>
>What exactly are you trying to accomplish?  That cnippet does not make any
>sense.  You cannot extern a block of code, only entire functions.  Please
>copy-paste your actual code as-is so we can see what you are actually doing.
>
>
>Gambit
>
>