Check if folders name starts with certain string - c++

Question

Hello so basically what i want is to loop through all folders in a given directory and find a folder which contains 4p in it´s name
for (const auto& folderIter : filesystem::directory_iterator(roaming))
{
if (folderIter.path() == folderIter.path().string().contains("4p") != std::string::npos)
{
filesystem::remove(folderIter.path());
}
}
But this code does not work

Answer 1

Since you told:
im trying to find a folder which starts with the name 4p. Nothing more
Does this meet your demands?:
#include <iostream>
#include <vector>
using namespace std;
int
main ()
{
std::vector < std::string > _strings;
// adding some elements to iterate over the vector
_strings.emplace_back ("4p_path");
_strings.emplace_back ("4p_path1");
_strings.emplace_back ("3p_path");
_strings.emplace_back ("4p_path2");
_strings.emplace_back ("2p_path");
_strings.emplace_back ("4p_path3");
for (const auto & p:_strings)
{
std::string first_two = p.substr (0, 2);// 0 = begin, 2 = end
if (first_two == std::string ("4p")) // I assume 4p as suffix
{
std::cout << "4p\n";
}
else
{
std::cout << "not 4p\n";
}
}
return 0;
}
Since you said that I have to find exact folders that have 4p suffixes, I should add this one:
#include <string>
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main()
{
std::vector < std::string > _Folders;
std::string path = "F:\\MyMusicProjects";// your directory
// get the name of all folders and add it into folders vector
for (const auto& entry : fs::directory_iterator(path)) {
_Folders.emplace_back(std::string(entry.path().filename().string()));
}
// iterate over folders
for (const auto& p : _Folders)
{
// p variable is the folder name and we compare it to check wheter it starts with 4p or not
if (p.substr(0, 2) == "4p")
std::cout << "found\t" << path << "\\" << p << "\n";
else
std::cout << "was not 4p\t" << path<< "\\" << p << "\n";
// don't forget, p is the folder name, to get full path as string:
// std::string fullPath = path+"\\"+p;
}
return 0;
}