Хитрый fstream

#include <windows.h>
#include <fstream>
#include <vector>
#include <string>
#include <stdio.h>
 
using namespace std;
string mem;
int pos;
 
int FileLength(iostream &f)
{
  f.seekg(0,ios::end);
  int L=f.tellg();
  f.seekg(0,ios::beg);
  return L;
};
 
void LoadFile(string FN)
{
  fstream f;
  f.open(FN.c_str(),ios_base::in);
  if(!f)return;
  int L=FileLength(f); mem.resize(L);
  f.read(&mem[0],L);
  f.close(); pos=0;
};
 
int main(int argc, char* argv[])
{
  LoadFile("GameScene.qap");
  for(int i=3800;i<3900;i++)
    printf("[%i] = '%X'\n",i,(unsigned char)mem[i]);
  system("pause");
  return 0;
}

int main(int argc, char* argv[])
{
  LoadFile("GameScene.qap");
  for(int i=0;i<mem.size();i++)
  {
    if(i%8==0)printf("\n"); printf("%.2X ",(unsigned char)mem[i]); 
  };
  printf("\n");
  system("pause");
  return 0;
}

void LoadFile(string FN)
{
  fstream f;
  f.open(FN.c_str(),ios_base::in);
  if(!f)return;
  int L=FileLength(f); mem.resize(L); 
  f.close(); pos=0;
  //////////////////////////////////
  FILE *file;
  file = fopen(FN.c_str(),"rb"); 
  fgets(&mem[0],L,file);
  fclose(file);
  //f.readsome(&mem[0],L);
  //////////////////////////////////
};

#include <iostream>
#include <fstream>
#include <iomanip>
 
int main ( int argc, char **argv ) {
 
    if ( 2 != argc ) {
        std::cout << "Usage : " << argv[0] << std::endl;
        return 1;
    }
 
    std::ifstream in ( argv[1], std::ios_base::in, std::ios_base::binary );
    if ( !in.is_open() ) {
        std::cout << "Failed to open : " << argv[1] << std::endl;
        return 2;
    }
 
    int i = 0;
    while ( in.good() ) {
        char data = 0;
 
        std::fstream::pos_type previous_pos = in.tellg();
        in.read ( & data, sizeof ( char ) );
        std::fstream::pos_type current_pos = in.tellg();
 
        std::cout 
            << "#" << i++ << " ... 0x" << std::hex << std::setw ( 2 ) << std::setfill('0') << static_cast <int> ( data )
            << " ... good ? " << std::boolalpha << in.good() << " ... " << std::dec << previous_pos << "/" << current_pos << std::endl;
    }
 
    in.close();
    return 0;
}