Hi there, I want to write a function that can return one record from a file ervery time, for example, the records in input.txt are like this:

_________________________
12 dd
DH: mm struct{
  int a;
  char b;
  m1 struct {
  int c;
  int d;
  };
  m2 struct {
  int e;
  int f;
  };
}
2 dfdkk
df
dd

}
1
    LOCAL_PARAM: ssi_struct {
ref = 0;
header = {
req = 0xa;
};
}



DH: mm struct{
  int a;
  char b;
  m1 struct {
  int c;
  int d;
  };
}
____________________________________
[download]

I want to use a function to extract the records starting with "DH:" each time I call it,like this $record = get_record("input.txt"); So I must remember the position of the file last read, and continue to extract the record. I use the seek and tell, but it didn't work. Here is the script:

sub get_record_from_file {
 my $filein = shift;
 my $regex = shift;
 my $pos = shift
 open FILEIN, "<$filein" or die "!$\n";
 seek(FILEIN, $pos, 0);
 my $in_block = 0;
 my $last = "}";
 my @array = {};
 
 foreach my $line (<FILEIN>) {
   if ($line =~ /$regex/) {
     $in_block = 1;
   }
   if ($in_block) {
     push @array, $line;
   }
   if ($line =~ m/$last$/) {
     $in_block = 0;
   }
  }
  $pos = tell FILEIN;
  return (\@array, $pos);
}

$record = get_record_from_file("input.txt","DH:",0);
[download]

Can anyone help? Thanks:)

Update

correct some mistakes: Here is the script:

sub get_record_from_file {
 my $filein = shift;
 my $regex = shift;
 my $pos = shift
 open FILEIN, "<$filein" or die "!$\n";
 seek(FILEIN, $pos, 0);
 my $in_block = 0;
 my $last = "}";
 my @array = {};
 
 foreach my $line (<FILEIN>) {
   if ($line =~ /$regex/) {
     $in_block = 1;
   }
   if ($in_block) {
     push @array, $line;
   }
   if ($line =~ m/$last$/) {
     $in_block = 0;
     last;
   }
  }
  $pos = tell FILEIN;
  return (\@array, $pos);
}
my $curpos = 0;
($record,$curpos) = get_record_from_file("input.txt","DH:",$curpos);
[download]

The $curpos is not updated. For example, you call the function once, and return the $curpos = 174; next time I call it, $curpos is still 174. Thanks:)

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