Solved

how to use system function in perl

Posted on 2008-06-25
4
768 Views
Last Modified: 2012-06-27
Hello,

I wish to execute a c programm form a perl script.
say like this::I think did something wrong in the system function syntax.Please correct me.

$result = system("gcc file.cpp");
if($result == 0){
print "Cmpilation success\n";
chdir("C:\Dev-Cpp\bin\");
system("a.out");
}
elsif($result==1){
print "Compilation not success";
}

0
Comment
Question by:rakeshreddy42
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 13

Expert Comment

by:kawas
ID: 21864871
maybe something like the following will work for you?

my $exit = system ("gcc", "file.cpp");
my $rez = _how_exit($exit);
print "Cmpilation success\n";
   $exit = system ("c:/Dev-Cpp/bin/a.out");
) if ( $rez == 0 );
 
 
sub _how_exit {
    my ($exit) = @_;
    my ($status) = $exit >> 8;
    my ($signal) = $exit & 255;
    return $status unless $signal;
    return $signal;
}

Open in new window

0
 
LVL 1

Expert Comment

by:danstuken
ID: 21864879

hi rakeshreddy,

Can you state where the problem actually lies?  From your message I'm guessing the call to system() isn't working.  You should note that system() doesn't necessarily return '1' on a failure but the result of the wait() system call (assuming such a call exists in windows).

You might find using the backticks operator (``) gives more useful information, e.g.:

print "Running....\n", `gcc file.ccp`, "\n";

You could try something like the following:


my @cmd = ("gcc" "file.cpp");
my $ret = system(@cmd);
if( $ret == 0 ){
   print "All good\n";
}else{
   print "Error with system(): ", $!, " returned : ", $ret, "\n";
   print "Exit code : ", $ret >> 8, "\n";
}

Open in new window

0
 
LVL 13

Expert Comment

by:kawas
ID: 21864902
sorry, premature submit!
my $exit = system ("gcc", "file.cpp");
my $rez = _how_exit($exit);
do {
   print "Cmpilation success\n";
   $exit = system ("c:/Dev-Cpp/bin/a.out");
} if ( $rez == 0 );
 
print "Compilation not success" if ( $rez != 0 );
 
sub _how_exit {
    my ($exit) = @_;
    my ($status) = $exit >> 8;
    my ($signal) = $exit & 255;
    return $status unless $signal;
    return $signal;
}

Open in new window

0
 
LVL 84

Accepted Solution

by:
ozo earned 300 total points
ID: 21867804
"\b" is the backspace character.
That's probably not the name of the directory
chdir("C:/Dev-Cpp/bin/");


$result==1 may be better as $result!=0
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx.. MOST IMPORTANT: Use Unix file format while saving Your script. otherwise it will have ^M s or smth likely weird in the EOL, Then DO NOT use m…
A year or so back I was asked to have a play with MongoDB; within half an hour I had downloaded (http://www.mongodb.org/downloads),  installed and started the daemon, and had a console window open. After an hour or two of playing at the command …
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question