parallel port accesses using turbo c in window xp

[ankur_c]

Dear members,
I am trying to use the LPT port of PC for some I/O application,my application works well is windows 98 environment, but i want it to use it in XP as XP don't allow to access ports,so I have tried sevelal options available in the web,one option is to use the following code but it didn't work.

#include<stdio.h>
#include<conio.h>

int main(void) {
unsigned port = 0x378 // first pin in parallel port 0x378-0x37f
int value ;
value = outp(port,'c') // c is the number you'll send to LPT
printf("value %c sent to port %d\n", value, port);
return 0 }

so i have tried with using inpout32.dll but it gives several errors when I compile with TURBO C 3.0.I have a also complied a test application given in logix4u.net but it gives the same errors.
I am attaching the same.can anybody pl. help me out in resolving the problem.
/**************************************************/
/*** ***/
/*** TEST.c -- test interface to inpout32.dll ***/
/*** ( **broken link removed** ) ***/
/*** ***/
/*** Copyright (C) 2003, Douglas Beattie Jr. ***/
/*** ***/
/*** <beattidp(at)ieee.org> ***/
/*** http://www.hytherion.com/beattidp/ ***/
/*** ***/
/**************************************************/
/*******************************************************/
/* */
/* Builds with Borland's Command-line C Compiler */
/* (free for public download from Borland.com, at */
/* **broken link removed** ) */
/* */
/* Compile with: */
/* */
/* BCC32 -IC:\BORLAND\BCC55\INCLUDE TEST.C */
/* */
/* */
/* Be sure to change the Port addresses */
/* accordingly if your LPT port is addressed */
/* elsewhere. */
/* */
/*******************************************************/
#include <stdio.h>
#include <conio.h>
#include <windows.h>

/* Definitions in the build of inpout32.dll are: */
/* short _stdcall Inp32(short PortAddress); */
/* void _stdcall Out32(short PortAddress, short data); */


/* prototype (function typedef) for DLL function Inp32: */

typedef short _stdcall (*inpfuncPtr)(short portaddr);
typedef void _stdcall (*oupfuncPtr)(short portaddr, short datum);

int main(void)
{
HINSTANCE hLib;
inpfuncPtr inp32;
oupfuncPtr oup32;

short x;
int i;

/* Load the library */
hLib = LoadLibrary("inpout32.dll");

if (hLib == NULL) {
printf("LoadLibrary Failed.\n");
return -1;
}
/* get the address of the function */

inp32 = (inpfuncPtr) GetProcAddress(hLib, "Inp32");

if (inp32 == NULL) {
printf("GetProcAddress for Inp32 Failed.\n");
return -1;
}
oup32 = (oupfuncPtr) GetProcAddress(hLib, "Out32");

if (oup32 == NULL) {
printf("GetProcAddress for Oup32 Failed.\n");
return -1;
}

/***************************************************************/
/* now test the functions */

/* Try to read 0x378..0x37F, LPT1: */

for (i=0x378; (i<0x380); i++) {

x = (inp32)(i);

printf("port read (%04X)= %04X\n",i,x);
}

/***** Write the data register */

i=0x378;
x=0x77;

(oup32)(i,x);

printf("port write to 0x%X, datum=0x%2X\n" ,i ,x);

/***** And read back to verify */
x = (inp32)(i);
printf("port read (%04X)= %04X\n",i,x);

/***** One more time, different value */

i=0x378;
x=0xAA;

(oup32)(i,x);

printf("port write to 0x%X, datum=0x%2X\n" ,i ,x);

/***** And read back to verify */
x = (inp32)(i);
printf("port read (%04X)= %04X\n",i,x);

FreeLibrary(hLib);
return 0;

regards
Ankur

 

[nandhu015]

I some where heard that using giveio.dll can solve this problem

Google for more details

Nandhu

 

[elrayes]

try porttalk or userport, friend tried userport and gave good results with parallel port.

 

[egeorgiev]

WinXP is not DOS, it will block any direct access to a real address from an application. What you need is a driver to map the port in your address space.