Re: Running an application and capturing output

Like thunderkgnat says, you're probably missing the $ infront of log->info;
deparsing that code

C:\Documents and Settings\erickn\Desktop\invexp>perl -MO=Deparse -e"lo
+g->info"
log($_)->info;
-e syntax OK
[download]

shows that you are executing log, a builtin function of perl. Since $_ is not set it tries to do a log of 0 which is not defined.
Try putting use strict; and use warnings; at the top of your script to help track down bugs like these.

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Re^2: Running an application and capturing output by chromatic (Archbishop) on Jun 02, 2005 at 04:13 UTC
Why would `$_` not be set in a while loop? What would either strict or warnings do in a case like this?	[reply] [d/l]
Re^3: Running an application and capturing output by mifflin (Curate) on Jun 02, 2005 at 04:58 UTC
Strict because, well, it's just a good idea. Warnings because, if he had it on, would probably have seen something like `C:\Documents and Settings\erickn\Desktop\invexp>e.pl line 1 Can't take log of 0 at C:\Documents and Settings\erickn\Desktop\invexp +\e.pl line 9, <DATA> line 1.` [download] Note that I am guessing what his batch file would return to stdout. My test code to produce the above output... `#use warnings; use strict; use Log::Log4perl qw(); Log::Log4perl::init("process.conf"); my $log = Log::Log4perl->get_logger(); #open APP, "Exception.bat \|" or die "File not found\n"; while(<DATA>){ print; log->info; } print "Out of batch file\n"; __DATA__ line 1 line 2` [download] update: I suppose that's not alot of extra info but it is more that he had and might have made it easier for him to figure it out on his own. shrugs	[reply] [d/l] [select]