linux下和windows 下 snprintf函数的区别

最新推荐文章于 2024-08-15 18:40:05 发布

Explorer_learner

最新推荐文章于 2024-08-15 18:40:05 发布

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文章标签： windows linux output string

本文链接：https://blog.youkuaiyun.com/Explorer_learner/article/details/5462475

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本文详细介绍了snprintf函数在Linux和Windows平台上的行为差异。在Linux下，snprintf会在指定位置添加终止符并返回实际写入的字符数（不包含终止符）。而在Windows环境下，_snprintf则不会自动添加终止符。文章强调了在使用该函数时应注意这些平台间的区别。

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在linux下面，snprintf函数的说明：

Return value
       Upon successful return, these functions return the number of characters printed (not including the trailing
       '/0' used to end output to strings). The functions snprintf() and vsnprintf() do not write more than size
       bytes (including the trailing '/0'). If the output was truncated due to this limit then the return value is
       the number of characters (not including the trailing '/0') which would have been written to the final string if
       enough space had been available. Thus, a return value of size or more means that the output was truncated. (See
       also below under NOTES.) If an output error is encountered, a negative value is returned.

也就是说，snprintf函数会在第n - 1个位置上自动拷贝一个/0,并且返回一个不包括结尾/0的，实际拷贝的字符数目。

在windows下面，_snprintf实际上不会给你在最后加上/0。这就是区别，用的时候要注意了.