RE: executing c program from perl script and grabbing output

[Shishir K. Singh]

I have a c program which takes two commandline arguments (both strings) and 
prints out a line. If I use system then I am not able to grab the output of the 
program and if I use backquotes `` then the arguments are also treated as 
commands and I get an error.
  Is there any other way to do this.  Ganapathy

try 
-
open(FL, |$cmd @args);
while (FL){
print $_;
}
close (FL);


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Re: executing c program from perl script and grabbing output

[drieux]

On Tuesday, July 2, 2002, at 11:23 , Shishir K. Singh wrote:

 I have a c program which takes two commandline arguments (both strings) 
 and
 prints out a line. If I use system then I am not able to grab the output 
 of the
 program and if I use backquotes `` then the arguments are also treated as
 commands and I get an error.
  Is there any other way to do this.  Ganapathy

 try
 -
 open(FL, |$cmd @args);

isn't that suppose to be

open(FL, $cmd @args |);

so that We can read the stdout of $cmd - vice writing
stuff to it

also isn't it safer to do the

open(FL, $cmd @args 21 |) or
die unable to deal with $cmd @args : $!\n;

so that we get back all of the stdErr from $cmd,
and expressly EXPLODE if there is some obvious reason
that we can not execute $cmd ???

 while (FL){
 print $_;
 }
 close (FL);
 

If you want to test stuff without actually having the
command you can use uncle drieux's Handy Dandy DoCmd.txt
spoofer - cf:

http://www.wetware.com/drieux/pbl/perlTrick/drieuxTemplates/DoCmd.txt


ciao
drieux

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RE: executing c program from perl script and grabbing output

[Shishir K. Singh]

On Tuesday, July 2, 2002, at 11:23 , drieux wrote:

 I have a c program which takes two commandline arguments (both strings) 
 and
 prints out a line. If I use system then I am not able to grab the output 
 of the
 program and if I use backquotes `` then the arguments are also treated as
 commands and I get an error.
  Is there any other way to do this.  Ganapathy

 try
 -
 open(FL, |$cmd @args);

isn't that suppose to be

   open(FL, $cmd @args |);

so that We can read the stdout of $cmd - vice writing
stuff to it

Damm those pipes...I always get confused between reading and writing!!
You are correct!! 


also isn't it safer to do the

   open(FL, $cmd @args 21 |) or
   die unable to deal with $cmd @args : $!\n;

so that we get back all of the stdErr from $cmd,
and expressly EXPLODE if there is some obvious reason
that we can not execute $cmd ???

 while (FL){
 print $_;
 }
 close (FL);
 

This was just a test code. The validation and checks can be added by the programmer as 
desired. 

If you want to test stuff without actually having the
command you can use uncle drieux's Handy Dandy DoCmd.txt
spoofer - cf:

http://www.wetware.com/drieux/pbl/perlTrick/drieuxTemplates/DoCmd.txt

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