C++遍历文件夹获取文件列表

#include<iostream>
#include<stdlib.h>
#include<windows.h>
#include<fstream>
#include<stdio.h>
#include<vector>
#include<string>
#pragma comment (lib,"winmm.lib")
using namespace std;

void MainMenu()
{
  printf("请选择操作n");
  printf("1.显示当前文件夹的所有文件n");
  printf("2.返回上一级n");
  printf("3.进入文件夹n");
  printf("4.进入指定文件夹n");
  printf("5.退出n");
}
void ShowFileList(string filename)
{
  WIN32_FIND_DATAA p;
  vector<string> filelist;
  HANDLE h = FindFirstFileA(filename.c_str(),&p);
  filelist.push_back(p.cFileName);
  while (FindNextFileA(h,&p))
  {
    filelist.push_back(p.cFileName);
    if (filelist.back() == "." || filelist.back() == "..")
    {
      filelist.pop_back();
    }
  }
  for (int i = 0; i < filelist.size(); i++)
  {
    cout << filelist[i] << endl;
  }
}

void ShowLastFileList(string & filepath)
{
  string filepath2 = filepath;
  string tmp = "../";
  tmp += filepath2;
  filepath = tmp;
  ShowFileList(tmp);
}
void ShowSelectFileList(string filepath)
{
  string yourchoose;
  cin >> yourchoose;
  yourchoose += '/';
  string filepath2 = filepath;
  yourchoose += filepath2;
  ShowFileList(yourchoose);
}
void case4(string filepath)
{
  string filename;
  cin >> filename;
  filename += '/';
  filename += filepath;
  ShowFileList(filename);
}
int main()
{
  string filepath;
  filepath = "*.*";
  string filePath = filepath;
  while (1)
  {
    system("CLS");
    MainMenu();
    int n;
    cin >> n;
    switch (n)
    {
    case 1:
      system("CLS");
      ShowFileList(filePath);
      system("pause");
      break;
    case 2:
      system("CLS");
      ShowLastFileList(filePath);
      system("pause");
      break;
    case 3:
      system("CLS");
      ShowSelectFileList(filePath);
      system("pause");
      break;
    case 4:
      system("CLS");
      case4(filepath);
      system("pause");
      break;
    case 5:
      exit(0);
      break;
    default:
      break;
    }
  }
  return 0;
}