mysql在window平台支持utf8吗，怎么有乱码出现?

my.ini 中配置为
default-character-set=utf8
库和表都用了utf8
SHOW VARIABLES LIKE 'character_set_%';
+--------------------------+------------------------------------------+
| Variable_name | Value |
+--------------------------+------------------------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| |
+--------------------------+------------------------------------------+
测试程序插入数据也是utf8编码
显示header头也是utf8;
但是读出来数据都是 ??号，什么原因？