std::basic_istream::read

// read a file into memory
#include <iostream>     // std::cout
#include <fstream>      // std::ifstream
int main () {
  std::ifstream is ("test.txt", std::ifstream::binary);
  if (is) {
    // get length of file:
    is.seekg (0, is.end);
    int length = is.tellg();
    is.seekg (0, is.beg);
    char * buffer = new char [length];
    std::cout << "Reading " << length << " characters... ";
    // read data as a block:
    is.read (buffer,length);
    if (is)
      std::cout << "all characters read successfully.";
    else
      std::cout << "error: only " << is.gcount() << " could be read";
    is.close();
    // ...buffer contains the entire file...
    delete[] buffer;
  }
  return 0;
}