Question

I am puzzled at the following difference.

$str="\xd6\xd0";
decode("GBK",$str);

vs.

$str="d6d0";
@list=map "\\x".$_,unpack("(a2)*", $str);
$str=join "", @list;
decode("GBK",$str);

Why in the first case, it worked to print out the character, while in the second case, it is not working? How can I make it to work in the latter case?

Many thanks.

Answer 1

If you’re trying to turn "d6d0" into "\xd6\xd0", you want pack 'H*':

my $str = "d6d0";
$str = pack('H*', $str);
decode("GBK",$str);

join does not interpret escape sequences, it just concatenates strings.