How to get parent folder from path in C++ - c++

Question

I am using C++ in linux and I want to extract the parent folder from a path in C++ 14.
For example, I have the path likes
/home/abc/fi.mp4
My expected output be abc. How can I do it in C++
This is that I did
std::string getFolderName(const std::string &path) {
size_t found = path.find_last_of("/\\");
string foldername = ...
return foldername;
}

Answer 1

I believe the experimental version of std::filesystem was already available in C++14.
If it is indeed available in your environment, you can use parent_path() to get the parent folder from a path. Then you can use the method filename() to extract the name without the full path specification.
In order to convert a path to std::string you can use the string() method.
#include <string>
#include <iostream>
#include <experimental/filesystem>
int main(int argc, char const* argv[])
{
std::string path_str = "/home/abc/fi.mp4";
std::experimental::filesystem::path p = path_str;
std::experimental::filesystem::path parent_p = p.parent_path();
std::experimental::filesystem::path parent_p_fname = p.parent_path().filename();
std::string result_str = parent_p_fname.string();
std::cout << result_str << std::endl;
return 0;
}
Output:
abc
You can further use parent_path() to climb up the hirarchy.
Once C++17 is available for you, you can simply drop the experimental prefix.

Answer 2

You probably want something like this:
// Returns the path-string without the filename part
std::string getFolderPath(const std::string &path) {
const size_t found = path.find_last_of("/\\");
return (found == string::npos) ? path : path.substr(0, found);
}
// Returns only the filename part (after the last slash)
std::string getFileName(const std::string & path) {
const size_t found = path.find_last_of("/\\");
return (found == string::npos) ? path : path.substr(found+1);
}

Answer 3

The function getFolders will get you all the folder names in a path.
#include <vector>
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
vector<string> getFolders(const char* path) {
vector<string> folders;
stringstream ss;
int i = 0, k = 0;
char c;
while ((c = *(path + i)) != '\0') {
if (c != '/'){
ss << c;
++k;
}
else {
if (k > 0){
folders.push_back(ss.str());
ss.str(string());
k = 0;
}
}
++i;
}
return folders;
}
void main()
{
vector<string> folders = getFolders("/home/abc/fi.mp4");
for (auto f : folders){
cout << f << endl;
}
}