从boost :: filesystem :: is_directory捕获异常 [英] catching exception from boost::filesystem::is_directory

问题描述

我目前正在捕获来自boost :: filesystem :: is_directory的错误，并通过在异常中调用what（）向用户显示错误。这给出了失败的原因，但用户的错误是奇怪的。例如：

I am currently catching errors from boost::filesystem::is_directory and showing the error to the user by calling "what()" on the exception. This gives the reason for failure but the error is strange to the user. For example:

boost :: filesystem :: is_directory：访问被拒绝

boost::filesystem::is_directory: Access is denied

我如何抓住提升错误，弄清楚实际原因是什么，所以我可以显示更好的错误消息？

How can I catch the boost error and figure out what the actual cause is, so I can show a nicer error message?

推荐答案

通过更好的错误消息，您的意思是像

By "nicer error message" would you mean something like

#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';
    }
}

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