警告信息非常明确：

'fopen'：这个函数或变量可能不安全。考虑使用fopen_s代替。



见这里： http://msdn.microsoft.com/en-us/library/ttcz0bys.aspx [ ^ ]



这意味着新代码不建议使用 fopen ，因为它可能会从未来版本中删除，并被更新，更好的版本所取代 - 在此case fopen_s



要么使用它建议的更现代的等价物，要么禁用警告（我会去第一个选项，我自己）

The warning message is quite explicit:
"'fopen': This function or variable may be unsafe. Consider using fopen_s instead."

See here: http://msdn.microsoft.com/en-us/library/ttcz0bys.aspx[^]

What it means is that fopen is not recommended for new code, as it may be removed from future version, having been superceeded by a newer, better version - in this case fopen_s

Either use the more modern equivalent as it suggests, or disable the warning (I'd go with the first option, myself)