== Инкапсуляция. Чтение заголовка bmp ==

<note>
При компиляции использовать ключ --pack-struct
</note>

<code c++>
// Programming 1. Sample at 2017-05-04-14-20.53
#include <stdio.h>

union BMP_HEADER
{
  char data[14];
  struct 
  {
    unsigned short signature;
    unsigned int size;
    unsigned int reserved12;
    unsigned int offset;
  } hdr;
};


class BmpImage
{
  FILE *m_file;
  char *m_data;
  const char *m_name;
  BMP_HEADER m_header;

public:

  BmpImage() 
  {
    m_file = NULL;
    m_data = NULL;
    m_name = NULL;
  }

  BmpImage(const char *name) 
  {
    m_name = name;
    m_file = NULL;
    m_data = NULL;
    printf("Hello, I'm created, my name is %s\n",m_name);
  }
  
  void print()
  {
    for(int i=0;i<sizeof(m_header);++i)
    {
      printf("%c(%x)",m_header.data[i],m_header.data[i]);
    }
   printf("[%u %u %u %u]\n",m_header.hdr.signature,
                            m_header.hdr.size,
                            m_header.hdr.reserved12,
                            m_header.hdr.offset); 
  }

  bool open()
  {
    m_file = fopen(m_name, "rb");
    if(NULL == m_file)
      return false;
    fread(&m_header.data,sizeof(char),sizeof(m_header.data),m_file);
//    m_data = new char [???];
    return true;
  }

  ~BmpImage()
  {
    if(m_file)
      fclose(m_file);
    printf("bye I'm destroyed, my name was %s\n",m_name);
  }
};


int main(/*int c, char **v */)
{
  BmpImage b("image.bmp");   
  if(!b.open())
  {
    printf("Couldn't open image\n");
    return -1;
  }
  
  printf("BMP_HEADER size = %ld\n",sizeof(BMP_HEADER));

  b.print();
  return 0;
}
</code>