Funkcja read i odczyt pliku

#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;
}