c++ - 从 boost::filesystem::is_directory 捕获异常

Question

我目前正在捕获来自 boost::filesystem::is_directory 的错误，并通过在异常上调用“what()”向用户显示错误。这给出了失败的原因，但错误对用户来说很奇怪。例如:

boost::filesystem::is_directory: Access is denied

我如何捕获 boost 错误并找出实际原因，以便显示更好的错误消息？

Answer 1

“更好的错误信息”是指类似的东西吗

#include <iostream>
#include <boost/filesystem.hpp>
int main()
{
    boost::filesystem::path p("/proc/1/fd/1");
    try {
       boost::filesystem::is_directory(p);
    } catch(const boost::filesystem::filesystem_error& e)
    {
       if(e.code() == boost::system::errc::permission_denied)
           std::cout << "Search permission is denied for one of the directories "
                     << "in the path prefix of " << p << "\n";
       else
           std::cout << "is_directory(" << p << ") failed with "
                     << e.code().message() << '\n';
    }
}