printer_open()

PHP
1 
$handle = printer_open("EPSON TM-T88IV Receipt");
if($handle)
echo "connected";
else
echo "not connected";

this s not displaying anything

2

It could be an error that is causing the script to stop. Do you have error reporting on?

3 
<?php  error_reporting(E_ALL);
require_once("../shared/common.php");
	  session_cache_limiter(null);
 	 $tab = "profile";
  	 $nav = "profile";
	 require_once("../shared/header.php");
	  require_once("../shared/logincheck.php");
 	 require_once("../classes/Localize.php");
$handle = printer_open("EPSON TM-T88IV Receipt");
for($j=0;$j<10;$j++) {
$mydata = "This is count number ".$j;
printer_write($handle,$mydata); }
printer_close($handle);

this is the complete page
the header is being loaded
but nothing else

4

One by one, comment out each line of code after the last point where it works. You will find your problem.

5

i tried to even tat
but it seems as if php is not reading those statements also
see my first code
even the else part was not being executed
do i need to make ny changes in the settings?

6

is display_errors on?

Anyway, start with a blank file. Add tiny bits of code at a time. This will help you see what part doesn’t work. Part of debugging is isolating the problem as much as possible. For example, you think you have a problem with printer_open(). So, why have all this other code in the file? Get it all out of there.

7 
<?php  error_reporting(E_ALL);
$handle = printer_open("EPSON TM-T88IV Receipt");
echo "xyz";
?>

this is giving me a blank page

8

that means you have display_errors off

9

how do i on it?

10

you can set it in php.ini, or you can use ini_set() in the script. You can often set it in .htaccess too(if php is being run as an apache module). For development, you definately should set it in php.ini, because ini_set() may not work when you have parse errors.

http://www.php.net/manual/en/configuration.changes.php

11

there was no option of setting it in php.ini
i mean i did not know how to do that
so i used ini_set()
code is

<?php  ini_set('display_errors', 'on');
error_reporting(E_ALL);
$handle = printer_open("EPSON TM-T88IV Receipt");
if($handle)
echo "connected";
printer_close($handle);
?>

error now is
Fatal error: Call to undefined function printer_open() in C:\www\webroot\guru\home
ew_print.php on line 3