警告；编译中出现 This function or variable may be unsafe.

1. 编译中出现如下语句：

This function or variable may be unsafe. 

Consider using strncpy_s instead. 

To disable deprecation, use _CRT_SECURE_NO_WARNINGS. 

See online help for details.

在文件开头添加：#define  _CRT_SECURE_NO_WARNINGS

错误会消失。

2. vs中可以

Properties-----> Common Properties-----> C/C++ ------> Preprocessor        
Preprocessor Definitions  -----> 添加 
_CRT_SECURE_NO_WARNINGS
参考资料：
http://stackoverflow.com/questions/16883037/remove-secure-warnings-crt-secure-no-warnings-from-projects-by-default-in-vis

http://stackoverflow.com/questions/22450423/how-to-use-use-crt-secure-no-warnings

http://stackoverflow.com/questions/22450423/how-to-use-use-crt-secure-no-warnings