mysql_binlog_tutorial

struct_in_c.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct
{
  int id;
  uint32_t age;
  char firstName[32];
  char lastName[32];

} Person;

int main()
{
  FILE *fd;

  // open file for writing
  fd = fopen("person.bin", "w");
  if (fd == NULL)
  {
    fprintf(stderr, "\nError opened file\n");
    exit(1);
  }

  Person p1 = {1, 20, "Mahadir", "Ahmad"};
  Person p2 = {2, 50, "Albert", "Einstein"};
  Person p3 = {3, 80, "Albus", "Dumbledore"};

  // Save the struct into the opened file
  fwrite(&p1, sizeof(Person), 1, fd);
  fwrite(&p2, sizeof(Person), 1, fd);
  fwrite(&p3, sizeof(Person), 1, fd);

  // close file
  fclose(fd);

  // open file for reading
  fd = fopen("person.bin", "r");
  if (fd == NULL)
  {
    fprintf(stderr, "\nError opened file\n");
    exit(1);
  }

  Person person;
  printf("sizeof(Person): %ld \n", sizeof(Person));
  while (fread(&person, sizeof(Person), 1, fd))
  {
    printf("%d %d %s %s\n", person.id,
           person.age, person.firstName, person.lastName);
  }

  fclose(fd);

  return 0;
}