Функции win32 CreateFile WriteFile и ReadFile

#include "stdafx.h"
#include <Windows.h>
#include <string.h>
#include <iostream>
using namespace::std;
 
class users{
public:
char* username;
unsigned short number;
void output();
users& operator = (users&);
users(void);
~users(void);
};
 
users::users(void){
username = new char[16];
strcpy_s (username, 16, "None");
number = 0;}
 
void users::output(){
cout << " " << number << " \t\t " << username << endl;}
 
users::~users(){
if (username){
delete[] username;
username = NULL;}}
 
users& users::operator=(users& M){
    strcpy_s(username, 16, M.username);
    number=M.number;
    return *this;}
 
 
int main(){
DWORD retByte;
users mas[8];
TCHAR stdPath[30] = TEXT("D:\\gamebaseuser.txt");
HANDLE mfile = CreateFile(stdPath, GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (mfile == INVALID_HANDLE_VALUE){
printf("Error open file\n");}
else{
    for (int i=0; i<8; i++){
        WriteFile (mfile, &mas[i], sizeof(mas[i]), &retByte, NULL);}
    CloseHandle(mfile);}
return 0;}

#include "stdafx.h"
#include <Windows.h>
#include <string.h>
#include <iostream>
using namespace::std;
 
class users{
public:
char* username;
unsigned short number;
void output();
users& operator = (users&);
users(void);
~users(void);
};
 
users::users(void){
username = new char[16];
strcpy_s (username, 16, "None");
number = 0;}
 
void users::output(){
cout << " " << number << " \t\t " << username << endl;}
 
users::~users(){
if (username){
delete[] username;
username = NULL;}}
 
users& users::operator=(users& M){
    strcpy_s(username, 16, M.username);
    number=M.number;
    return *this;}
 
int main(){
DWORD retByte;
users mas[8];
TCHAR stdPath[30] = TEXT("D:\\gamebaseuser.txt");
HANDLE mfile = CreateFile(stdPath, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (mfile == INVALID_HANDLE_VALUE){
printf("Error open file\n");}
else{
    for (int i=0; i<8; i++){
        ReadFile (mfile, &mas[i], sizeof(mas[i]), &retByte, NULL);
        mas[i].output();}
    CloseHandle(mfile);}
system("pause");
return 0;}