std::filesystem::recursive_directory_iterator 异常 [英] The std::filesystem::recursive_directory_iterator exception

问题描述

以下函数:

void foo(const std::string& dir)
{
    for (auto& el : std::filesystem::recursive_directory_iterator(dir)) {
            std::cout << el.path() << '\n';
    }
}

用于:

int main()
{
    std::string p = "C:\\";
    foo(p);
}

当它到达 Windows 10 上的某个文件夹(我假设)时引发异常.代码是在 VS 2017 上编译的，支持 C++17.异常消息是:

raises an exception when it reaches a certain folder (I assume) on Windows 10. The code is compiled on VS 2017 with C++17 support. The exception message is:

recursive_directory_iterator::operator++: The system cannot find the path specified.

同样的行为在使用 std::filesystem::directory_iterator 时也会发生.为什么会在该特定文件夹上引发异常?

The same behavior occurs when using the std::filesystem::directory_iterator too. Why is it raising an exception on that particular folder?

推荐答案

显然，当操作系统拒绝访问其中一个文件夹的权限时会引发异常.

Apparently, exception is raised when the OS denies a permission to access one of the folders.

解决方法是利用适当的递归目录迭代器构造函数重载(第四个)并提供 skip_permission_denied 参数:

The workaround is to utilize the appropriate recursive directory iterator constructor overload (4th one) and supply the skip_permission_denied parameter:

for (auto& el : std::filesystem::recursive_directory_iterator(dir, std::filesystem::directory_options::skip_permission_denied)) {
    std::cout << el.path() << '\n';
}

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