Re: Not able to write using Open2

Ashwin wrote: 
Paul Lalli wrote:


Ashwin wrote:

SOrry, I missee one quatation
here is compiled code,
is there no way I can get it done with open2?


Get what done?  I don't see anywhere in the code below in which you
attempted to write to the process.


use warnings;
use strict;
use IPC::Open2;
use Cwd;

my $currentdir=cwd();
my $pid;
chdir ("/source/internal/") or die "Cannot Change Directory";
$pid = open2 (\*READ,\*MY_WRITE,"BuildInternal.pl") or die;


Here you open the process BuildInternal.pl, with a read filehandle
READ and a write filehandle MY_WRITE


while (<READ>) 

Here you begin reading from READ


{
 print $_;


Here you print the lines read from READ out to STDOUT


 }

print "MY_WRITE\n"; 

Here you print the string "MY_WRITE\n" out to STDOUT


while (<READ>) 

Here you again read from READ


{
 print $_;


Here you again print the lines read from READ out to STDOUT


 }

close MY_WRITE;
close READ;


Here you close both filehandles.

What part of this code were you expecting to write anything to the
MY_WRITE filehandle?



sorry for missing the valid part
this part of the script

print "MY_WRITE\n"; should have been

print MY_WRITE "4\n"; 

Do you mean that your script contained
  print "MY_WRITE\n";
end you have now corrected it to
  print MY_WRITE "4\n";
and everything is OK now?

Or do you mean your script contained the latter all along but that instead of using copy & paste you are still retyping and making typing mistakes. In which case you still want help?

to clarify that value 4 need to be written in output handle and then  a
carridge return so that called script gets value as 4

IIRC on a Unix host, "\n" will emit a linefeed character, not the carriage-return character you mention. This might be causing you problems?

.

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