Dunno if this works on win32, but assuming you can do you postprocessing AFTER the command is run: 
open CMD,"|prog.exe >out.log" or die "$!";
print CMD "stuff";
close CMD;

open LOG,"<out.log" or die "$!"
while (<LOG>) {
   process($_);
}
close LOG;

[download]
HTH, Joost 
-- 
#!/usr/bin/perl -w
use strict;$;=
";Jtunsitr pa;ngo;t1h\$e;r. )p.e(r;ls ;h;a;c.k^e;rs 
";$_=$;;do{$..=chop}while(chop);$_=$;;eval$.;

[download]

In reply to Re: write to cmd and save output by Joost
in thread write to cmd and save output by Discipulus

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