🚀 go-pugleaf

I am trying to read parallel port of PC while using windows 
XP.i have got a manufacturer driver, which has got a DLL file 
to communicate with parallel port. but i am having a linker 
error which is confusing me ,and i don't know how to solve it 
the source code is below followed by the errors

*************************************
#include <stdio.h>
#include <dos.h>
# include "BytioXP.h" //manufacturer's provided header file//

#define baseadd (0x378)

extern "C"

void __import __stdcall OutVal(unsigned short IOAddress, unsigned short Value);
short __import __stdcall InpVal(unsigned short IOAddress);

{
int x;
OutVal(baseadd,5);
x == InpVal(baseadd);
cout << "the value is " << x<<;
getch();
return 0;
}

and the error which comes up after compiling is 

[Linker Error] Unresolved external 'OutVal' referenced from C:\PROGRAM FILES\BORLAND\CBUILDER4\PROJECTS\PROJECT2.OBJ.

[Linker Error] Unresolved external 'InpVal' referenced from C:\PROGRAM FILES\BORLAND\CBUILDER4\PROJECTS\PROJECT2.OBJ.

please tell me where things are going wrong.. and how can i fix them 
regards