文本文件编码探测几个链接

http://outofmemory.cn/code-snippet/1232/c-how-detect-wenbenwenjian-coding

http://www.cnblogs.com/08shiyan/archive/2013/04/19/3031257.html

http://www.codeguru.com/cpp/misc/misc/multi-lingualsupport/article.php/c10451/The-Basics-of-UTF8.htm

C# 用于取得一个文本文件的编码方式
http://www.cnblogs.com/sixstar01/archive/2013/01/24/2875677.html