C4996 ---- _CRT_SECURE_NO_WARNINGS

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问题：

在使用老版本的CRT(C Run-Time)函数，如strcpy、strcat、fopen时就会出现一些警告信息，在vs2102中我的出现的是如下错误信息：

error C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS;

error C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS;

原因：

Many old CRT functions have newer, more secure versions. If a secure function exists, the older, less secure version is marked as deprecated and the new version has the _s ("secure") suffix.

In this context, "deprecated" just means that a function's use is not recommended; it does not indicate that the function is scheduled to be removed from the CRT.

解决方案：

方案一：项目-->属性-->配置属性-->C/C++-->预处理器，在"预处理器定义"中加入"_CRT_SECURE_NO_WARNINGS"。

方案二：项目-->属性-->配置属性-->C/C++-->命令行，在"其他选项"中加入"/D _CRT_SECURE_NO_WARNINGS"。

方案三：在代码中加入预处理指令#pragma warning( disable : 4996 )。

方案四：项目-->属性-->配置属性-->C/C++-->常规，将"SDL检查"设置为"否"。

关于SDL：Adds recommended Security Development Lifecycle (SDL) checks. These checks include extra security-relevant warnings as errors, and additional secure code-generation features.这也就是为什么在上面我的提示为error，当把"SDL检查"设置为"否"后，提示便会变为warning，如下：

warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS;

参考链接：

Compiler Warning (level 3) C4996

Security Features in the CRT

/sdl (Enable Additional Security Checks)

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