// main.cpp
#include <iostream>
#include "img.h"
int main()
{
    img * imgf = new img("lena512.bmp");
    img::BITMAPFILEHEADER buf;
    imgf->read_bitmap_f(buf);
    std::cout << buf.bfSize << std::endl; // bydet 4.!!!!!!!!!
    return 0;
}


//img.h
#ifndef IMG_H
#define IMG_H


class img
{
    public:
        img(char *);
        ~img();

        // Заголовок файла
        typedef struct tagBITMAPFILEHEADER
        {
                unsigned short bfType;
                unsigned int bfSize;
                unsigned short bfReserved1;
                unsigned short bfReserved2;
                unsigned int bfOffBits;
        } BITMAPFILEHEADER;

        void read_bitmap_f(BITMAPFILEHEADER &);
    protected:

    private:

};

#endif // IMG_H



//src/img.cpp

#include "img.h"
#include <fstream>

std::fstream imgf;
img::img(char * name_of_img_)
{
    imgf.open(name_of_img_);
    //ctor
}
void img::read_bitmap_f(BITMAPFILEHEADER &buf)
{
    imgf.read((char*)&buf, sizeof(BITMAPFILEHEADER));
}
img::~img()
{
    imgf.close();
    //dtor
}