help about Convert gb2312 to utf8 in Perl!

how to convert a string variable from gb2312 into utf8 ?

detail:

1. I want this PerlScript can execute in Solaris.

2. piconv.bat can convert encoding, but it's only for Windows.

3. I have tried some method, such as :

method1: use Encode;

$gb2312="北京";

$utf8=encode("utf8",$gb2312);

print "$utf8";

method2: use Encode;

$gb2312="北京";

$utf8=encode_utf8($gb2312);

print "$utf8";

method3: use encoding 'utf8', STDIN => 'gb2312',STDOUT => 'utf8';

$gb2312="北京";

$utf8=$gb2312;

print "$utf8";

But all failed!

I want the best method as follow, but which Perl_internal_function can realize it?

$gb2312="北京";

$utf8 = some_function_can_convert_gb2utf8($gb2312);

print "$utf8";

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