strcpy不work~~~
char * strcpy ( char * dest, const char * src );
如果是string的话,会出错~~~
error C2664: 'strcpy' : cannot convert parameter 1 from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' to 'char *'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called