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我在執行代碼時遇到了一件奇怪的事 除了player_count的值之外，其他事情都沒有問題。當我從文件中再次讀取數據時，儘管名稱和電子郵件已正確更新，但它仍然爲0。 爲什麼player_count仍然等於0 ??????數據庫混淆
這裏是代碼：
#define MAX_DATA 128
#define STRLEN 101
#define FILENAME "C:\\Users\\ahmed\\Desktop\\C codes\\new_game\\data_base.dat"
typedef struct
{
char name[STRLEN] ;
char email[STRLEN] ;
int score ;
int id ;
int Set ;
} player_t ;
typedef struct
{
player_t player[MAX_DATA] ;
int player_count ;
}DataBase ;
typedef struct
{
DataBase db ;
FILE *filename ;
}Connection ;
void Store_Player_Database(int score)
{
Connection *conn = Creat_Connection(FILENAME);
player_t *player = conn->db.player ;
Read_Database(conn) ;
int player_num = conn->db.player_count ;
printf("Your name : ") ;
get_str(player[player_num].name , STRLEN) ;
printf("Your e-mail : ") ;
get_str(player[player_num].email , STRLEN) ;
player[player_num].Set = 1 ;
player[player_num].score = score ;
conn->db.player_count++ ;
printf("count here = %d\n",conn->db.player_count) ;
Write_Database(conn) ;
}
Connection *Creat_Connection(const char *filename)
{
Connection *conn = calloc(1,sizeof(Connection)) ;
//check_mem(conn) ;
int i = 0;
for(i = 0 ; i< MAX_DATA ; i++)
conn->db.player[i].id = i+1 ;
/// for update or read
conn->filename = fopen(filename , "r+") ;
//check(db->filename , "File open failed !") ;
return conn ;
}
int Read_Database(Connection *conn)
{
int rc ;
if(conn)
{
if(conn->filename)
{
DataBase *db = &conn->db ;
rc=fread(db,sizeof(DataBase),1,conn->filename); // load database from file .
printf("count = %d\n" , db->player_count) ;printf("%s %s \n" , db->player[0].name , db->player[0].email);
/* if (rc != 1)
{
printf("Error load database from file\n") ;
return -1 ;
}*/
}
}
return 1 ;
}
int Write_Database(Connection *conn)
{
int rc ;
if(conn)
{
if(conn->filename)
{
rewind(conn->filename) ;
DataBase *db = &conn->db ;printf("%s %s count = %d \n" , db->player[0].name , db->player[0].email , conn->db.player_count);
rc = fwrite(db,sizeof(DataBase),1,conn->filename) ;
if (rc != 1)
{
printf("Error load database from file\n") ;
return -1 ;
}
fflush(conn->filename) ;
}
}
return 1 ;
}
/*****************************/
int main(void)
{
int score = 5 ;
/* any code here */
Store_Player_Database(score) ;
Store_Player_Database(score +1) ; // at that call i get name and mail correct but player_count still zero ??? why?!
return 0 ;
}