摘要： http://aminby.net/2010/06/the-mothed-of-base64-coding-for-objc/http://qzc770707.blog.163.com/blog/static/34082753201022442356502/http://www.daniweb.com/forums/thread283020.htmlhttp://www.crazycoder.cn/mypdf/1429.pdf 阅读全文