I load the config file in the main program using do,
<main.pl>
#!perl
do "conf";
use strict;
print "value of v is $vn";
------------------------------------
and the config file has only one line,
<conf>
$v = 'hello';
when I run the main.pl, it reports following error, how to fix this?
Global symbol "$v" requires explicit package name at main.pl line 4.
Execution of main.pl aborted due to compilation errors.
Full Version: use strict and load
On Mon, 4 Jul 2005, Ken Killer wrote:
| QUOTE |
| I load the config file in the main program using do, <main.pl #!perl do "conf"; use strict; print "value of v is $vn"; ------------------------------------ and the config file has only one line, <conf $v = 'hello'; |
Have you tried making that
my $v = 'hello';
?
When you `use strict`, you need to declare your variables.
--
Chris Devers
Could you be more specific what is the code supposed to achieve? Besides
that, I got the same mistake, though it does run without "strict" like ...
#!/usr/bin/perl
use warnings;
require "conf.pl";
print "value of v is $vn";
# got me value of v is hello (:
# do "conf"; Disabled 'cause not needed.
I dunno much about perl, this line looks
very strange to me (: The only "do" I met was like... a loop structure,
say...
do {$line = <STDIN>;}while ($line ne "");
that, I got the same mistake, though it does run without "strict" like ...
#!/usr/bin/perl
use warnings;
require "conf.pl";
print "value of v is $vn";
# got me value of v is hello (:
# do "conf"; Disabled 'cause not needed.
I dunno much about perl, this line looks
very strange to me (: The only "do" I met was like... a loop structure,
say...
do {$line = <STDIN>;}while ($line ne "");
And - it works with "strict" if cooked this way
# ========== this here is main.pl======
#!/usr/bin/perl
use warnings;
use strict;
require "conf2.pl"; #so it knows where to go
print "tha value of v izz $conf2::vn";
#it's $v from conf2.pl, not from main
# ========== this here is conf2.pl======
#!/usr/bin/perl
use warnings;
package conf2;
$v = 'hello';
1;
# it wants a package - give 'im a package (:
# ========== this here is main.pl======
#!/usr/bin/perl
use warnings;
use strict;
require "conf2.pl"; #so it knows where to go
print "tha value of v izz $conf2::vn";
#it's $v from conf2.pl, not from main
# ========== this here is conf2.pl======
#!/usr/bin/perl
use warnings;
package conf2;
$v = 'hello';
1;
# it wants a package - give 'im a package (:
I tried to add 'my' before $v, but I got same error as before.
On 7/5/05, Chris Devers <[Email Removed]> wrote:
On 7/5/05, Chris Devers <[Email Removed]> wrote:
| QUOTE |
| On Mon, 4 Jul 2005, Ken Killer wrote: I load the config file in the main program using do, <main.pl #!perl do "conf"; use strict; print "value of v is $vn"; ------------------------------------ and the config file has only one line, <conf $v = 'hello'; Have you tried making that my $v = 'hello'; ? When you `use strict`, you need to declare your variables. -- Chris Devers |
Youare trying to print the value of $v before its declaration
print "value of v is $vn";
Try defining this variable before this print statement.
Shobha Deepthi V
The statement below is true.
The statement above is false.
Ken Killer wrote:
print "value of v is $vn";
Try defining this variable before this print statement.
Shobha Deepthi V
The statement below is true.
The statement above is false.
Ken Killer wrote:
| QUOTE |
| I tried to add 'my' before $v, but I got same error as before. On 7/5/05, Chris Devers <[Email Removed]> wrote: On Mon, 4 Jul 2005, Ken Killer wrote: I load the config file in the main program using do, <main.pl #!perl do "conf"; use strict; print "value of v is $vn"; ------------------------------------ and the config file has only one line, <conf $v = 'hello'; Have you tried making that my $v = 'hello'; ? When you `use strict`, you need to declare your variables. -- Chris Devers |
Ken Killer wrote:
| QUOTE |
| I load the config file in the main program using do, <main.pl #!perl do "conf"; use strict; print "value of v is $vn"; ------------------------------------ and the config file has only one line, <conf $v = 'hello'; when I run the main.pl, it reports following error, how to fix this? Global symbol "$v" requires explicit package name at main.pl line 4. Execution of main.pl aborted due to compilation errors. |
perldoc -f do
Specifically the section for 'do EXPR' and more specifically the example
at the bottom. You should be error checking your call to 'do'. And of
particular importance is the line:
"Note that inclusion of library modules is better done with the "use"
and "require" operators, which also do automatic error checking and
raise an exception if there's a problem."
In this case you need to provide the package name for $v because it
hasn't been declared, or declare it with 'our'.
perldoc -f our
Either in 'main.pl', add:
our $v;
or use,
print "value of v is $::vn";
Of course there are better ways to handle program configuration, there
are numerous modules on CPAN for handling all manners of formatted
config files.
http://danconia.org
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