c++文件关闭会不会失败

2025-03-15 09:18:38
推荐回答(1个)
回答1:

关闭文件失败,会有以下几个原因:
1、传参错误。传递给fclose的参数不是来自fopen、freopen或者tmpfile函数返回的正确文件指针。如果用上述三个函数打开文件不成功而不检查返回的文件指针是否正确,甚至没有给文件指针赋值,最后再传给fclose的时候也会关闭文件失败。
2、重复关闭文件。如果在前面的执行流程的某个分支里把文件已经关闭了,在后面重复执行fclose关闭这个文件,也导致关闭失败。
3、磁盘空间满或者磁盘故障。在写文件过程中,文件内容并没有真正存入磁盘空间,而是保留在缓冲区中,以便提高访问速度。到关闭文件时,系统要把缓冲区中的数据真正写入到磁盘上,如果磁盘空间满了或者磁盘有故障,关闭文件就会失败。
4、设备文件异常。C语言支持操作系统把各种设备虚拟成设备文件。关闭这些设备文件时,如果设备异常(比如设备断开了),关闭文件也可能会失败。
5、打开的文件,一直被占用(写入数据的代码有误等导致的文件一直被占用)

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