C++的文件操作

#include <iostream>
#include <fstream>
#include "stdlib.h"

#include <string>
#include <windows.h>
#include <sstream>


using namespace std;

namespace Tool
{
    class FileHelper
    {
        public:
            FileHelper();
            ~FileHelper();
            void CopyFile1();
            void CopyFile2();
            void CopyFile3();
            void CreatFile1();
            void WriteFile();

        private:

    };

        FileHelper::FileHelper()
        {
            ifstream examplefile ("example.txt");
             std::ifstream input("E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123.ISO",ios::binary);
             std::ofstream output("E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123_1.ISO",ios::binary);
             char ch;
             while (input.get(ch)) output << ch;

        }

        FileHelper::~FileHelper()
        {}

        //效率较高
        void FileHelper::CopyFile1()
        {
            //c style writing file
            FILE* fp = fopen("E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123.ISO","rb");
            FILE* fp1 = fopen("E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123_1.ISO", "ab");
            const int BUF_SIZE = 1024*100;
            char buf[BUF_SIZE];
            int len = 0;
            do
            {
                len = fread(buf,1,BUF_SIZE,fp);
                fwrite(buf, 1, len, fp1);
            }while(len != 0);
            //15s

            fclose(fp);
            fclose(fp1);
        }
        void FileHelper::CopyFile2()
        {
            std::ifstream input("E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123.ISO",ios::binary);
            std::ofstream output("E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123_1.ISO",ios::binary|ios::app);

            const int max = 1024*512;
            char ch[max];
            while (!input.eof())
            {
                input.read(ch, max);
                output.write(ch, input.gcount());
            }

            output.flush();
        }
        void FileHelper::CopyFile3()
        {
            string sourceFile = "E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123.ISO";
            string destFile = "E:\\Software\\SW_DVD5_Project_Pro_2013_64Bit_ChnSimp_MLF_X18-55123_1.ISO";
            CopyFile(sourceFile.c_str(), destFile.c_str(), TRUE);
        }

        void FileHelper::CreatFile1()
        {
            string testFolder="E:\\temp\\Copy2";
            for (int i = 0; i < 1000; i++)
            {
                stringstream sstrm;
                sstrm<<i;
                string filename = testFolder+"\\"+sstrm.str()+".txt";
                CreateFile(filename.c_str(),GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
            }
            //0.2s
        }

        void FileHelper::WriteFile()
        {
            //file
            ofstream examplefile ("name.txt",ios::app);

            if (examplefile.is_open()) {

            examplefile << "\n";
            examplefile << "This is a line.\n";
            examplefile << "This is another line.\n";

            examplefile.close();
            }
        }
}