How can I tell if a given path is a directory or a file? (C/C++)

stat() will tell you this.

struct stat s;if( stat(path,&s) == 0 ){    if( s.st_mode & S_IFDIR )    {        //it's a directory    }    else if( s.st_mode & S_IFREG )    {        //it's a file    }    else    {        //something else    }}else{    //error}

Call GetFileAttributes, and check for the FILE_ATTRIBUTE_DIRECTORY attribute.

With C++14/C++17 you can use the platform independent is_directory() and is_regular_file() from the filesystem library.

#include <filesystem> // C++17#include <iostream>namespace fs = std::filesystem;int main(){    const std::string pathString = "/my/path";    const fs::path path(pathString); // Constructing the path from a string is possible.    std::error_code ec; // For using the non-throwing overloads of functions below.    if (fs::is_directory(path, ec))    {         // Process a directory.    }    if (ec) // Optional handling of possible errors.    {        std::cerr << "Error in is_directory: " << ec.message();    }    if (fs::is_regular_file(path, ec))    {        // Process a regular file.    }    if (ec) // Optional handling of possible errors. Usage of the same ec object works since fs functions are calling ec.clear() if no errors occur.    {        std::cerr << "Error in is_regular_file: " << ec.message();    }}

In C++14 use std::experimental::filesystem.

#include <experimental/filesystem> // C++14namespace fs = std::experimental::filesystem;

Additional implemented checks are listed in section "File types".