参考：
[1]http://blog.csdn.net/yunyu5120/article/details/6692072 [2]http://blog.csdn.net/superdullwolf/article/details/4649080 [3]http://blog.csdn.net/morewindows/article/details/7354571 [4]http://blog.csdn.net/hguisu/article/details/7892596 [5]http://nassir.iteye.com/blog/1994914
