LPT: Need help to READ and WRITE to port

[jp_in_calif]

Hi all,

I want to hook some instrumentation to the LPT1: port, control and read its status through this port. However, my compiler (VC++ 6.0) on a Windows XP machine does not recognize 'inportb' or 'outportb' (used in some very old instructions). Here is the basic elements of that code and what I'm attempting to do;

#include <stdio.h>
#include <dos.h>

void main(void)
{
  int val; 
  val=inportb(0x378);       //readport
   outportb(0x378,0x0F);    //write to port
  val=inportb(0x378);       //read again. should be 0F 
  printf("%x \n",val);
}

Is there some other funciton that I should be using ?

Does someone have a snip of code I could use ?

Thanks

[XSquared]

I'm not sure if it's possible to do that with Windows XP at all. You might wanna search the board for inportb and outportb.

[Draco]

yes, use fopen("prn","w") to create a file pointer to the printer. You can then use all the regular file output functions like fwrite().

[jp_in_calif]

Thanks Draco !

That has got me started. I was able to produce output !
Now I need to figure out the input bytes and status bytes.