Iterating over a list of objects c++

Basically I am creating a basic shell program for a class project. I am stuck on iterating through the files/folders within a directory.

My error is in the function DisplayDirectoryContents()

class Directory 
{
private:
map<string, pair<list<Folder>, list<File> > > directoryContents;
string directoryPath;

public:
list<Folder> getFolders() {return directoryContents[directoryPath].first;}
list<File> getFiles() {return directoryContents[directoryPath].second;}
string getDirectoryPath() {return directoryPath;}

Directory() 
{
    directoryPath = "root/"; 
    File *file = new File("Test");
    directoryContents[directoryPath].second.push_back(*file);
}
void DisplayDirectoryContents()
{
    // Get files and folders from directory
    list<File> files = this->getFiles();

    for(int i = 0; i < files.size(); i++)
    {
        cout << files->getFileName(); << Error here
    }

}
};

I've tried setting this function up a few different ways but I can't seem to get the right kind of code to make it work.

I would think this would work but it's throwing me errors everytime I try and mess with the DisplayDirectoryContents() function. Does anyone have any tips that I can try to help fix this? Thanks

class File
{
string fileName;
string fileTime;
public:
string getFileTime(){return fileTime;}
string getFileName(){return fileName;}

void setFileTime(){time_t now = time(NULL);
                fileTime = ctime(&now);} 
void setFileName(string newFileName){fileName = newFileName;}
File(){}
File(string fName)
{
    fileName = fName;
    time_t now = time(NULL);
    fileTime = ctime(&now);
}
void MakeFile(string fName);
void RemoveFile(string fName); 
};

If you are able to use C++11 or higher, you can use a range for loop to iterate over the contents of the list.

void DisplayDirectoryContents()
{
    // Get files and folders from directory
    list<File> files = this->getFiles();

    // Iterate over each item in the list.
    // Use a reference to avoid copying of the items.
    for ( File& file : files )
    {
        cout << file.getFileName();
    }
}