C++ UNIX下C++删除文件

Remove file in C++ under UNIX

提问by Todd Gamblin

How do you guys typically delete files on Linux OS? I am thinking of using the unlinkfunction call, but I wonder if you have a better idea, as the C++ standard has no mention of file deletion operation and it is system dependent.

你们通常如何在 Linux 操作系统上删除文件？我正在考虑使用unlink函数调用，但我想知道您是否有更好的主意，因为 C++ 标准没有提到文件删除操作，并且它依赖于系统。

回答by Todd Gamblin

Yep -- the C++ standard leaves this stuff up to the OS, so if you're on Linux (or any POSIX system), unlink()is what you've got.

是的——C++ 标准将这些东西留给操作系统，所以如果你在 Linux（或任何 POSIX 系统）上，unlink()那就是你所拥有的。

The C standard provides remove(), which you could try, but keep in mind that its behavior is unspecifiedfor anything other than a 'regular file', so it doesn't really shield you from getting into platform-specific filesystem details (links, etc).

C 标准提供了remove()，您可以尝试，但请记住，除了“常规文件”之外，它的行为是未指定的，因此它并不能真正阻止您进入特定于平台的文件系统详细信息（链接等） .

If you want something higher-level, more robust, and more portable, check out Boost Filesystem.

如果你想要更高级、更健壮、更便携的东西，请查看Boost Filesystem。

回答by Johannes Schaub - litb

The Standard includes a function called removewhich does that. Though i would prefer boost.filesystemfor that (if i already use boost anyway).

标准包括一个名为remove的函数，它可以做到这一点。虽然我更喜欢boost.filesystem那个（如果我已经使用了 boost 的话）。

#include <cstdio>

int main() {
    std::remove("/home/js/file.txt");
}

回答by Alnitak

unlink()is defined by the POSIXstandards, and hence will exist on any POSIX compatible system, and on quite a few that aren't POSIX compatible too.

unlink()由POSIX标准定义，因此将存在于任何 POSIX 兼容系统上，并且存在于许多不兼容 POSIX 的系统上。

回答by smoofra

unlink is the correct way to do it.

unlink 是正确的方法。

回答by Yoric

Note that recent kernels also offer unlinkat. This function is faster than unlinkif you have a file descriptor on the directory itself.

请注意，最近的内核还提供unlinkat. 这个函数比unlink目录本身有文件描述符要快。