std::string targetFile = "simplehashingfile.txt";
const char* filename = targetFile.c_str();
std::ifstream file;

file.open( filename, std::ios::binary | std::ios::in );
file.seekg(0, std::ios::end);  //  go to end of file
std::streamsize size = file.tellg();  //  get size of file

std::vector<char> buffer(size);  //  create vector of file size bytes

file.read(buffer.data(), size);  //  read file into buffer vector
int totalread = file.gcount();

//  Check that data was read
std::cout<<"total read: " << totalread << std::endl;


//  check buffer:
std::cout<<"from buffer vector: "<<std::endl;
for (int i=0; i<size; i++){
    std::cout << buffer[i] << std::endl;
}
std::cout<<"nn";

//  Writing binary to file
std::ofstream ofile;
ofile.open("testbinary", std::ios::out | std::ios::binary);

uint32_t bytes4 = 0x7FFFFFFF;  //  max 32-bit value
uint32_t bytes8 = 0x12345678;  //  some 32-bit value


ofile.write( (char*)&bytes4 , 4 );
ofile.write( (char*)&bytes8, 4 );

ofile.close();



//  Reading from file
std::ifstream ifile;
ifile.open("testbinary", std::ios::out | std::ios::binary);

uint32_t reading;  //  variable to read data
uint32_t reading2;

ifile.read( (char*)&reading, 4 );
ifile.read( (char*)&reading2, 4 );

std::cout << "The file contains:  " << std::hex << reading << std::endl;
std::cout<<"next 4 bytes:  "<< std::hex << reading2 << std::endl;