Can't input chinese in fox gui?

hi ,everyone,i made a gui with fxruby,there is a problem, can’t input
chinese in the fox gui ,how to solve the problem?

there is an simple program,

require ‘rubygems’
require ‘fox16’
require ‘jcode’
$KCODE = ‘u’
include Fox
application =“测试”, “测试”)
main =, “Hello”, nil, nil, DECOR_ALL), “&测试, 测试!”, nil, application, FXApp::ID_QUIT)

测试 is the meaning of “test”,
when i run the program, an output :
Warning: $KCODE is NONE.

chinese character can’t display on the window,there are many boxes on
the window!

what’s the matter?