c++ 系统函数实现文件拷贝

#include "stdafx.h"
#include <string>
#include<windows.h>
#include<iostream>
#include <stdio.h>
#include<cstring>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
CopyFile(L"D:/cAddProgram/source_file/file1.txt", L"D:/cAddProgram/source_file/file3.txt", TRUE);

return 0;
}