如何将const std :: filesystem :: directory_entry转换为tchar？

Question

I'm trying to convert const std::filesystem::directory_entry (dirent) to tchar but I don't understand how it an be done. I tried a lot of ways. Can you help me?

Edited:

 #include "pch.h"
    #include <memory>
    #include <filesystem>
    #include <algorithm>
    #include <iostream>
    #include <tchar.h>
    #include <string.h>
    typedef wchar_t WCHAR;
    namespace fs = std::filesystem;

    int main() try
    {
        std::for_each(fs::recursive_directory_iterator("./foo/"), {},
            [](fs::directory_entry const& dirent)
        {

                if (fs::is_regular_file(dirent) &&
                    dirent.path().filename() == "black.txt")
                {
                    std::wstring = path.wstring();
                }


        });
    }
    catch (fs::filesystem_error const& e)
    {
        std::cerr << "error: " << e.what() << '\n';
    }

Answer 1

You can convert std::filesystem::path to any form using these functions :

std::string string() const;
std::wstring wstring() const;
std::u16string u16string() const;
std::u32string u32string() const;

TCHAR is somewhat of a relic as mentioned in the comments, and you're much better off using any of the above alternatives.

If you're going to pass it to Win32 API functions, I would either suggest using wstring explicitly and not bother with the shape-shifting TCHAR at all.

---

What your code should look like is this:

if (fs::is_regular_file(dirent) &&
    dirent.path().filename() == "black.txt")
{    
    std::wstring path_as_string = path.wstring();
}

No TCHAR , no C-style arrays no C-style memory copying.