//test reading binary of file for encryption
 
// reading a complete binary file
#include <iostream>
#include <fstream>
#include <vector>
 
#include <stdio.h> //for atoi convert char to int
#include <stdlib.h>
 
 
using namespace std;
vector<int> data;
vector<int>::iterator iter;
 
 
 
int size;
char * memblock;
 
int main () {
  ifstream file ("test.txt", ios::in|ios::binary|ios::ate);
  if (file.is_open())
  {
    size = file.tellg();
    memblock = new char [size];
    file.seekg (0, ios::beg);
    for (int i = 0; i < size; ++i)
        {
        file.read (memblock, size);
 
       //testing
        cout << memblock;
 
        //had error: invalid conversion from char to int
        //and invalid conversion from char to char ? when using vector<char>
        //so I did it this way to convert to int and use vector<int>
        int newData = atoi (memblock);
        data.push_back(newData);
        }
 
 
 
    file.close();
 
    cout << "the complete file content is in memory";
 
 
  }
  else cout << "Unable to open file";
 
  for (iter == data.begin(); iter != data.end(); ++iter)
  cout << *iter;
 
  cout << "\nPress Enter to exit.\n";
cin.ignore(cin.rdbuf()->in_avail() + 1);
 
  return 0;
}

vector<unsinged char> data;
...
...
unsigned char byt;
while( in.get(&byt) )
{
    data.push_back(byt);
}

//new binary read
 
 
#include <iostream>
#include <vector>
#include <fstream>
 
using namespace std;
vector<char> data;
vector<char>::iterator iter;
 
int main()
{
    ifstream file ("test.txt", ios::in|ios::binary);    
    unsigned char byt;
    while (file.get(&byt))
    {
          data.push_back(byt);
 
 
          }
    file.close();      
 
          for (iter == data.begin(); iter != data.end(); ++iter)
          cout << *iter;
 
 
 
      cout << "\nPress Enter to exit.\n";
cin.ignore(cin.rdbuf()->in_avail() + 1);
 
return 0;
}

    char byt;
    while (file.get(byt))

for (iter == data.begin(); iter != data.end(); ++iter)
// it should be ...
for (iter = data.begin(); iter != data.end(); ++iter)

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