Oh,yeah,I am successful!
I copy code from
http://www.rubyinside.com/how-to-create-a-ruby-extension-in-c-in-under-5-minutes-100.html
then

(1)ruby extconf.rb --with-mytest-dir="C:/sdk" 
--with-mytest-lib="C:/VClib" --with-mytest-include="C:\sdk\Include\crt"

(2)mt -manifest mytest.so.manifest -outputresource:mytest.so;2
(3)require "mytest"
include MyTest
puts test1

get Num "10",haha,very happy!


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