inp and outp troubles

[EvilCabal]

Hello,

I'm trying to control the parallel port via the functions inp and outp. First it did not compile at all, then I added an underscore to the function calls (i.e. _inp and _outp), now it compile but the program crashes! woohoo! Please help ;P

Here is the code, I'm using winXP and VC 6.0 w/ SP5 :

#include <dos.h>
#include &quot;bios.h&quot;
#include <stdio.h>
#include <conio.h>


#define BASE_ADDRESS 0x0378 // printer port base address
#define DATA_REGISTER (BASE_ADDRESS+0) // address of data register
#define STATUS_REGISTER (BASE_ADDRESS+1) // address of status register
#define CONTROL_REGISTER (BASE_ADDRESS+2) // address of control register

int main(void)
{

char my_byte = 0;
char Status;

/* Either of these 2 lines crash the program */
Status = _inp(STATUS_REGISTER);
_outp(DATA_REGISTER,my_byte);

return 0;

}

 

[xwb]

Direct control of hardware using inp/outp is blocked by the OS on Windows NT/2K/XP unless you are writing a device driver. It is something to do with ring 0/3 protection. You can still do it on 95/98/ME. Have a look at

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnfiles/html/msdn_serial.asp

Parallel comms is similar: just use LPT1: etc instead of COM1: