C++ “strcpy”和“strcpy_s”之间的区别？
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Difference between 'strcpy' and 'strcpy_s'?
提问by Bluebaby
When i tries to use strcpyto copy a string it gave me a compile error.
当我尝试使用strcpy复制字符串时，它给了我一个编译错误。
error C4996 'strcpy': This function or variable may be unsafe.
Consider using strcpy_sinstead. To disable deprecation,
use _CRT_SECURE_NO_WARNINGS. See online help for details.
考虑strcpy_s改用。要禁用弃用，请使用_CRT_SECURE_NO_WARNINGS. 详细信息请参见在线帮助。
What is the difference between strcpyand strcpy_s?
strcpy和 和有strcpy_s什么区别？
回答by Deadlock
strcpy is a unsafe funtion. When you try to copy a string using strcpy(), to a buffer which is not large enough to contain it, it will cause a buffer overflow.
strcpy 是一个不安全的函数。当您尝试使用 strcpy() 将字符串复制到不足以容纳它的缓冲区时，会导致缓冲区溢出。
strcpy_s() is a security enhanced versionof strcpy(). With strcpy_s you can specify the size of the destination buffer to avoid buffer overflows during copies.
strcpy_s() 是strcpy()的安全增强版本。使用 strcpy_s 您可以指定目标缓冲区的大小以避免复制期间缓冲区溢出。
char tuna[5]; // a buffer which holds 5 chars incluing the null character.
char salmon[] = "A string which is longer than 5 chars";
strcpy( tuna, salmon ); // This will corrupt your memory because of the buffer overflow.
strcpy_s( tuna, 5, salmon ); // strcpy_s will not write more than 5 chars.
回答by Navin
I'd like to add that if you ever try to compile other people's code, MS will always complain about unsafe functions in the standard library. Just define _CRT_SECURE_NO_WARNINGSlike the error message tells you to and MSVC will work like any other compiler.
我想补充一点，如果您尝试编译其他人的代码，MS 总是会抱怨标准库中的函数不安全。只需_CRT_SECURE_NO_WARNINGS像错误消息告诉您的那样定义，MSVC 将像任何其他编译器一样工作。
