Работа с текстовым файлом

#include <iostream>
#include <fstream>
using namespace std;
int main()
{
    ifstream in;
    ofstream out;
    in.open("1234.txt",ios::in);
    out.open("1.txt",ios::out);
    if (!in)
    {
        cerr<<"File not found!"<<endl;
        return 1;
    }
    char buf[1024];
    in.getline(buf,sizeof(buf));
    for(size_t i=0; i<strlen(buf); i++)
        out<<buf[i];
    in.close();
    out.close();
    return 0;
}

#include <fstream>
#include <algorithm>
#include <iostream>
#include <string>
#include <boost/filesystem/operations.hpp>
 
int main()
{
   const std::string Input_Filename = "1234.txt";
   const std::string Output_Filename = "1.txt";
   std::ifstream input_file(Input_Filename.c_str());
   std::ofstream output_file(Output_Filename.c_str());
   std::string str_temp;
 
   std::getline(input_file, str_temp, '\n');
   std::copy(str_temp.begin(), str_temp.end(), std::ostream_iterator <char>(output_file));
   boost::filesystem::path source_file(Input_Filename);
   boost::filesystem::path target_path(Output_Filename.substr(0, Output_Filename.find_last_of('.')));
 
   try
   {
      boost::filesystem::create_directory(target_path);
      boost::filesystem::copy_file(source_file, boost::filesystem::path(target_path.string() + "\\" + Input_Filename));
   }
   catch (std::exception& exc)
   {
      std::cerr << exc.what() << std::endl;
   }
 
   return 0;
}

TStringList* list;
TStringList* list2;
list->LoadFromFile(ExtractFilePath(ParamStr(0))+"1234.txt");
list2->Add(list->Strings[0]);
list2->SaveToFile(ExtractFilePath(ParamStr(0))+"1.txt");