Re^4: How to convert an @ARGV to form based input?

Greetings @grizzley, and thank you for your reply. Sadly, following your advice DOES define $domain, but doing so only nullifies the if loop. So the form fields never show up. FWIW, the perl output in the web log reveals:

Use of uninitialized value $domain in string ne at dnsdig.cgi line 9.
Use of uninitialized value $domain in concatenation (.) or string at d
+nsdig.cgi line 18.
Can't call method "answer" on an undefined value at dnsdig.cgi line 19
+.
[download]

If I understood you correctly, the code I used was:

#!/usr/bin/perl -w

use strict;
use Net::DNS;
my $dns = new Net::DNS::Resolver;

my $domain;

if($domain ne "") {
print "<form action=\"dnsdig.cgi\" method=\"post\">
<input name=\"domain\" type=\"text\" value=\"\" />
<input type=\"submit\" value=\"Get MX\" />
</form>";
} else {
    my $mx = $dns->query( $domain, 'MX' );

print "content-type:text/html; charset=utf-8\n\n";
    print "$domain:\n\n";
    foreach my $rr ($mx->answer) {
        print "<br />", $rr->exchange, ' [<b>', $rr->preference, "</b>
+]\n";
    }
}
[download]

Thanks again for taking the time to respond.
--Chris

#!/usr/bin/perl -Tw
use perl::always;
my $perl_version = "5.12.4";
print $perl_version;

Comment on Re^4: How to convert an @ARGV to form based input? Select or Download Code

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Re^5: How to convert an @ARGV to form based input? by grizzley (Chaplain) on Aug 21, 2012 at 08:04 UTC
Ok, now the error message looks differently, don't you agree? :) `$domain` is already defined, but uninitialized. Please replace `my $domain;` with `my $domain = 'google.com';` and check the result.	[reply] [d/l] [select]
Re^6: How to convert an @ARGV to form based input? by taint (Chaplain) on Aug 21, 2012 at 08:18 UTC
Yes, I agree. :) Just tried this: #!/usr/bin/perl -w use strict; use Net::DNS; my $dns = new Net::DNS::Resolver; my $domain; if($domain ne "") { my $mx = $dns->query( $domain, 'MX' ); print "content-type:text/html; charset=utf-8\n\n"; print "$domain:\n\n"; foreach my $rr ($mx->answer) { print "<br />", $rr->exchange, ' [<b>', $rr->preference, "</b> +]\n"; } } else { print "content-type:text/html; charset=utf-8\n\n"; print "<form action=\"dnsdig.cgi\" method=\"post\"> <input name=\"domain\" type=\"text\" value=\"\" /> <input type=\"submit\" value=\"Get MX\" /> </form>"; } [download] But again, fail: `Use of uninitialized value $domain in string ne at dnsdig.cgi line 9. Use of uninitialized value $domain in string ne at dnsdig.cgi line 9., + referer: ...` [download] Now I'll use your newest recommendation (which I know will work), but doesn't provide the empty form field I'm looking for -- but I'll do it anyway. :) --Chris #!/usr/bin/perl -Tw use perl::always; my $perl_version = "5.12.4"; print $perl_version;	[reply] [d/l] [select]
Re^7: How to convert an @ARGV to form based input? by taint (Chaplain) on Aug 21, 2012 at 08:28 UTC
Well, as you might expect, the output returned: `google.com: alt3.aspmx.l.google.com [40 +] alt4.aspmx.l.google.com [50 +] aspmx.l.google.com [10 +] alt2.aspmx.l.google.com [30 +] alt1.aspmx.l.google.com [20 +]` [download] Now, if I could only figure out how to return the form field... changing `eq ""` to `ne ""` didn't return form fields either. :( Thanks again for taking the time to respond. --Chris #!/usr/bin/perl -Tw use perl::always; my $perl_version = "5.12.4"; print $perl_version;	[reply] [d/l] [select]
Re^5: How to convert an @ARGV to form based input? by taint (Chaplain) on Aug 21, 2012 at 08:03 UTC
D'OH! That should have read: `if($domain eq "") {` not `if($domain ne "") {` Sorry. It still doesn't work. --Chris #!/usr/bin/perl -Tw use perl::always; my $perl_version = "5.12.4"; print $perl_version;	[reply] [d/l] [select]