#include <sstream>
 
[....]
stringstream ss;
ss << ffd.cFileName;
string str;
ss >> str;

#include <sstream>
#include <string>
#include <windows.h>
using namespace std;
 
int main()
{
TCHAR cFileName[] = TEXT("Hello World");
stringstream ss;
ss << cFileName;
string str;
ss >> str;
 
cout << str << "\n";
return 0;
}

#include "stdafx.h"
#include <windows.h>
#include <iostream>
#include <string>
 
using namespace std;
 
int main ()
{
	LPSTR str;
	WIN32_FIND_DATA ffd;
 
	HANDLE  hFind = FindFirstFile(L"c:\\windows", &ffd);
	if (hFind == INVALID_HANDLE_VALUE) 
	{
	   cout << "failed" << endl;
                   return 0;
	}
 
	_tprintf (TEXT("The first file found is %s\n"), ffd.cFileName);
	WideCharToMultiByte(0,WC_NO_BEST_FIT_CHARS,ffd.cFileName,-1,str,100,NULL,NULL);
 
	cout << "The first file found is (as LPSTR)" << str << "\n";
 
	cin.get();
	return 0;
}