std::filesystem::filesystem_error::what
来自cppreference.com
| |
(C++17 起) | |
返回解释性字节字符串。此解释性字符串含有在构造时传递的解释字符串。鼓励实现在返回的字符串中包含原生格式的 path1() 和 path2() 的路径名，以及 std::system_error::what() 字符串。
参数
（无）
返回值
包含构造时所传递的解释字符串的 C 风格解释字节字符串。
示例
运行此代码
#include <cstdio>
#include <filesystem>
#include <iostream>
#include <string_view>
namespace fs = std::filesystem;
void explain(std::string_view note, fs::filesystem_error const& ex)
{
std::cout << note << " exception:\n"
<< "what(): " << ex.what() << '\n'
<< "path1(): " << ex.path1() << ", path2(): "
<< ex.path2() << "\n\n";
}
int main()
{
try
{
std::filesystem::rename("/dev", "/null");
}
catch(fs::filesystem_error const& ex)
{
explain("fs::rename()", ex);
}
for (auto const path : {"/bool", "/bin/cat", "/bin/mouse"})
try
{
std::filesystem::create_directory(path);
}
catch(fs::filesystem_error const& ex)
{
explain("fs::create_directory()", ex);
}
}
可能的输出：
fs::rename() exception:
what(): filesystem error: cannot rename: Permission denied [/dev] [/null]
path1(): "/dev", path2(): "/null"
fs::create_directory() exception:
what(): filesystem error: cannot create directory: Permission denied [/bool]
path1(): "/bool", path2(): ""
fs::create_directory() exception:
what(): filesystem error: cannot create directory: File exists [/bin/cat]
path1(): "/bin/cat", path2(): ""
fs::create_directory() exception:
what(): filesystem error: cannot create directory: Read-only file system [/bin/mouse]
path1(): "/bin/mouse", path2(): ""