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Home: Perl Programming Help: Beginner:
"perl my.pl" is different from what i see from IE browser

 


ningji
User

Nov 12, 2012, 4:03 PM

Post #1 of 10 (7582 views)
"perl my.pl" is different from what i see from IE browser Can't Post
don't know how to describe it,
this is what i get from running from command line,

root@iSTAR000314:/opt/ultra/www# perl 3Diag.pl
Content-Type: text/html; charset=ISO-8859-1

<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-US">
<head>
<title>why</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
</head>
<body>
<h4>---------------------------</h4><h4>1</h4><h4>---------------------------</h4>
</body>
</html>



but in IE/firefox, i only see
------------------------
------------------------

not that "1"


(This post was edited by ningji on Nov 12, 2012, 4:04 PM)


ningji
User

Nov 12, 2012, 4:06 PM

Post #2 of 10 (7580 views)
Re: [ningji] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
my simple code is here, very appreciated for your help.

#!/usr/bin/perl -w

BEGIN { push @INC, "/usr/share/perl5"; }
BEGIN { push @INC, "/usr/share/perl5/CGI"; }

use strict;
use warnings;
use CGI;
use CGI qw(:standard);

# new CGI form
my $q1 = new CGI;
my @backendCmd;

my @getCmd;
my @getLevel;
my $gpioLevel = 0;

############################

# read from panel
@getCmd = `cd /opt/ultra/; showdata data/ACMClearanceDB.dbf 101 1 1`;
chomp($getCmd[0]);

@getLevel = split(/ {1,}/, $getCmd[0]);
$gpioLevel = $getLevel[0];

############################
print $q1->header();
print $q1->start_html(-title => 'why');

############################
print $q1->h4("---------------------------");
print $q1->h4($gpioLevel);
print $q1->h4("---------------------------");

print $q1->end_html;

exit 0;


ningji
User

Nov 12, 2012, 4:08 PM

Post #3 of 10 (7579 views)
Re: [ningji] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
if you run
cd /opt/ultra/; showdata data/ACMClearanceDB.dbf 101 1 1

from command line, it gives you 5 digits, e.g.
1 2 3 4 5


rovf
Veteran

Nov 13, 2012, 2:09 AM

Post #4 of 10 (7564 views)
Re: [ningji] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
If you view at the page source from your browser, what do you see then?


ningji
User

Nov 13, 2012, 7:15 AM

Post #5 of 10 (7560 views)
Re: [rovf] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
In Reply To
If you view at the page source from your browser, what do you see then?
it's missing that 1,
<h4>---------------------------</h4><h4></h4><h4>---------------------------</h4>

very confusing.


rovf
Veteran

Nov 13, 2012, 7:22 AM

Post #6 of 10 (7558 views)
Re: [ningji] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
This means that $gpioLevel is the empty string ('') in the error case .....

I fear you have to bite the bullet and debug, how this variable gets its value. My guess is that @getCmd doesn't contain what you expect (maybe it has one extra line in the beginning?), so I would first dump this variable:

Code
use Data::Dumper qw(Dumper); 
 
.... 
print $q1->h4(Dumper(\@getCmd));


ningji
User

Nov 13, 2012, 7:26 AM

Post #7 of 10 (7557 views)
Re: [rovf] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
Rovf,

if i run "perl my.pl" from command line,
i do see that 1.
this is why i get confused, :(

In Reply To
This means that $gpioLevel is the empty string ('') in the error case .....

I fear you have to bite the bullet and debug, how this variable gets its value. My guess is that @getCmd doesn't contain what you expect (maybe it has one extra line in the beginning?), so I would first dump this variable:

Code
use Data::Dumper qw(Dumper); 
 
.... 
print $q1->h4(Dumper(\@getCmd));


rovf
Veteran

Nov 13, 2012, 8:01 AM

Post #8 of 10 (7556 views)
Re: [ningji] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
Quote
if i run "perl my.pl" from command line,
i do see that 1.
... and that's why you have to debug it via the browser.


FishMonger
Veteran / Moderator

Nov 13, 2012, 9:28 AM

Post #9 of 10 (7547 views)
Re: [ningji] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
The most likely problem is that the user that the web server is running under does not have rights to access or execute showdata.

Did you check the web server error log for any clues?


ningji
User

Nov 13, 2012, 1:26 PM

Post #10 of 10 (7538 views)
Re: [FishMonger] "perl my.pl" is different from what i see from IE browser [In reply to] Can't Post
got it finally,
i need to put the full path to that "showdata".

this is the 2nd time i forget this.
thanks for all the help !

 
 


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