I am using VC++ 6.0, is there any code I can use to read or write to parallel port? For example to turn on/off a bulb (for sure it will be buffered).

With turbo C++ or Borland C++ (older versions) I can easily do this by using "inportb/inport" and "outportb/outport" commands to send/receive a "byte/word". For example by connecting 7 LEDs (each seried with a resistor) to seven pins of Par. port (Q0....Q7) I can turn them on/off anyway the bits of my unsigned char in outport command says.

Example:
void outportb(int port, unsigned char byte);
//char=0x61 or 0x21 for parallel port address in IBM standard

unsigned char inportb(int port);
//the seven bits of port(address) will be copied to the pre-defined unsigned char

(see turbo C bible for more details)

IF ANYBODY THROUGH ME A WORKING SOURCE CODE IT WOULD BE APPRECIATED WHOLE MY LIFE :D.

WOW...GOT SO LONG.....THANKS IN ADVANCE...

You will First have to buy some sort of automation card do get such a thing to work. Do you have that?


Regards
Ankur Verma

I/O Port Access in Microsoft Visual C++
Microsoft Visual C/C++ provides access to the I/O ports on the 80x86 CPU via the predefined functions _inp / _inpw and _outp / _outpw.


     int _inp(unsigned portid); /* returns a byte read from the I/O port portid */

unsigned _inpw(unsigned portid); /* returns a word read from the I/O port portid */

     int _outp(unsigned portid, /* writes the byte value to the I/O port portid */
                int value); /* returns the data actually written */

unsigned _outpw(unsigned portid, /* writes the word value to the I/O port portid */
                unsigned value); /* returns the data actually written */

portid can be any unsigned integer in the range 0-65535
#include <conio.h> /* required only for function declarations */

#define Data 0x378 /*SEE YOUR'S FROM BIOS OR SYSTEM INFO*/
                      /* YOUR'S MIGHTBE DIFERENT */
#define Status 0x379
#define Control 0x37a

int Bits, /* 0 <= Bits <= 255 */
    Dummy;

Dummy = _outp(Data,Bits); /* output data */

Bits = _inp(Status); /* input data */





Here's my Digital Joystick example


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last updated: 13-Mar-97 Ian Harries <[email protected]>

Do write back if you write a similar program for a NT based machines as well.