Storing C/C++ structures/objects

Can someone provide a complete example on storing C structures to Berkeley DB?  I having problems with the examples from the SleepyCat website.


int add(void)
{
      size_t len;
      u_int8_t *p, data_buffer[1024];

      DBT data, key;
      DB *dbp;
      int ret;
      long SerialNumber = 1989;

      info.data1 = "Hello World";
      info.data2 = 500;

      memset(&key, 0, sizeof(DBT));
      memset(&data, 0, sizeof(DBT));

      key.data = &SerialNumber;
      key.size = sizeof(SerialNumber);


      p = &data_buffer[0];
      len = strlen(info.data1);
      memcpy(p, &len, sizeof(len));
      p += sizeof(len);
      memcpy(p, info.data1, len);
      p += len;
      memcpy(p, &info.data2, sizeof(info.data2));
      p += sizeof(info.data2);


      data.data = &p;
      data.size = sizeof(p);

      if ((ret = db_create(&dbp, NULL, 0)) != 0)
      {
            fprintf(stderr, "db_create: %s\n", db_strerror(ret));
            return(ret);
      }
      if ((ret = dbp->open(dbp, NULL, DATABASE, NULL, DB_BTREE, DB_CREATE, 0664)) != 0)
      {
            dbp->err(dbp, ret, "%s", DATABASE);
            return(ret);;
      }

      if ((ret = dbp->put(dbp, NULL, &key, &data, 0)) == 0)
      {
            printf("db: %lu: key stored.\n", *(unsigned long *)key.data);
      }
      else
      {
            dbp->err(dbp, ret, "DB->put");
            return(ret);
      }

      ret = dbp->close(dbp, 0);



      return(ret);


}


int get(void)
{
      size_t len;
      u_int8_t *p, data_buffer[1024];

      DBT data, key;
      DB *dbp;
      int ret;

      long SerialNumber = 1989;



      if ((ret = db_create(&dbp, NULL, 0)) != 0)
      {
            fprintf(stderr, "db_create: %s\n", db_strerror(ret));
            return(ret);
      }
      if ((ret = dbp->open(dbp, NULL, DATABASE, NULL, DB_BTREE, DB_CREATE, 0664)) != 0)
      {
            dbp->err(dbp, ret, "%s", DATABASE);
            return(ret);;
      }


      memset(&key, 0, sizeof(DBT));
      memset(&data, 0, sizeof(DBT));


      key.data = &SerialNumber;
      key.size = sizeof(SerialNumber);




      if ((ret = dbp->get(dbp, NULL, &key, &data, 0)) == 0)
      {
            printf("db: %lu: key retrieved: data was %s.\n",
                *(unsigned long *)key.data, (char *)data.data);
      }
      else
      {
            //dbp->err(dbp, ret, "DB->get");
            return(ret);

      }

      strcpy(data_buffer,data.data);
      p = &data_buffer[0];
      memcpy(&len, p, sizeof(len));
      p += sizeof(len);
      info.data1 = malloc(len);
      memcpy(info.data1, p, len);
      p += len;
      memcpy(&info.data2, p, sizeof(info.data2));
      p += sizeof(info.data2);


      printf("%s\n",info.data1);

      return(0);

}


The examples do not really show how to store and receive the data structure so I have no way to determine if I am doing it correct.