hi ! can any one write a program for printing in c using PCL and using outportb function and not fprintf functions
using PCL(printer cammand language)
hi ! can any one write a program for printing in c using PCL and using outportb function and not fprintf functions
> can any one write a program for printing in c using PCL
Someone has for sure....
> using outportb function
Why? - it's a non-portable function
> not fprintf functions
Why not? - this is a portable function
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
NEVER mind that compatibility stuff . Given below is my code and it is int working properly . This program is intended to print wingding characters on a pcl compatible printer .However it is printing in ascii . thanks in advance
/************SOURCE CODE***********************/
#include<stdio.h>
#include<conio.h>
#include<dos.h>
#include<stdarg.h>
const int BASE = 0x378;
int checkackstatus();
void strobe();
void send(int data,...);
void init();
int checkprintstatus(); // not used in this program
void main()
{
clrscr();
init(); // init printer
send(27,69); // Reset
send(27,40,115,50,55,51,48,84); //wingdings
send(97,98,99,100,101,102,103,104,105,106,107,108, 109);//contents
send(27,69); // Reset
}
int checkackstatus()
{
unsigned char status = inportb(BASE+1);
int chkpnt = 1 ,row = 1;
if ((status & 0x40) != 0)
{
gotoxy(1,row++);
printf("Printer does not acknowledge");
chkpnt = 0;
}
return chkpnt;
}
void strobe()
{ unsigned char test;
test=inportb(BASE+2);
test&=0x1e;
outportb(BASE+2,test);
test|=1;
outportb(BASE+2, test);
}
void send(int data,...)
{
outportb(BASE, data); strobe();
while(!checkackstatus());
clrscr();
va_list ap;
int arg;
va_start(ap, data);
while ((arg = va_arg(ap,int)) != 0)
{
outportb(BASE, arg); strobe();
while(!checkackstatus());
clrscr();
}
va_end(ap);
}
void init()
{
unsigned char a=inportb(BASE+2);
a &= 235;
outportb(BASE+2,a);
a |= 4;
outportb(BASE+2,a);
while ((inportb(BASE+1) & 0x80) == 0)
{ printf("Printer is busy "); }
clrscr();
}
int checkprintstatus()
{
unsigned char status = inportb(BASE+1);
int chkpnt = 1 ,row = 1;
if ((status & 0x80) == 0)
{
gotoxy(1,row++);
printf("Printer is busy ");
chkpnt = 0 ;
}
if ((status & 0x40) != 0)
{
gotoxy(1,row++);
printf("Printer does not acknowledge");
chkpnt = 0;
}
if ((status & 0x20) != 0)
{
gotoxy(1,row++);
printf("Printer is out of paper ");
chkpnt = 0;
}
if ((status & 0x10) != 0)
{
gotoxy(1,row++);
printf("Printer is off line ");
chkpnt = 0 ;
}
if ((status & 0x08) != 0)
{
gotoxy(1,row++);
printf("Printer error ");
chkpnt = 0 ;
}
while(row <7)
{gotoxy(1,row++);
printf(" ");
}
return chkpnt;
}
/*****************END**************************/
Well there are big problems with your send function
1. Why so many calls to clrscr()? I mean, once for every character.
2. while ((arg = va_arg(ap,int)) != 0)
But your calls do not conform to this protocol.
For example
send(27,69); // Reset
This will send two bytes, and some unspecified number of garbage until the code chances upon a zero.
Try
send(27,69,0); // Reset
All your send calls should have a 0 as the last parameter
> void main()
Mmm - nope
main returns an int
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
ok. changed calls to send but still no luck.
void main()
{
clrscr();
// init printer
init();
send(27,69,0); // Reset
send(27,40,115,50,55,51,48,84,0); //wingdings
send(97,98,99,100,101,102,103,104,105,106,107,108, 109,0);
send(27,69,0); // Reset
}
for information on PCL here are the links :
http://itsa.ucsf.edu/~rpb/hppcl.html
http://www.hp.com/cgi-bin/cposupport...t_doc/bpd07298
http://homepages.borland.com/efg2lab...ojects/Prt.ZIP
> send(27,69,0); // Reset
Could you translate this into the character form, which means the same thing.
'E' has the decimal value 69.
send ( 27, 'E', 0 ); // Reset
It would make it easier to compare against the descriptions of the PCL.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
