Question

我有这个结构：

struct match {
    int round;
    int day, month, year;
    int hour, minutes;
    char *home_team;
    char *visitor_team;
    int home_score;
    int visitor_score;
    int number_of_spectators;
};

我有这个函数从文件中加载som值。

struct match matches[198];

int get_matches_from_file(struct match *matches)

我在for循环中设置了这个值：

int year, month, day, hour, minute;
int m_round;
int home_score, visitor_score;
char home[3], visitor[3];
int spectators;

sscanf(line[i], "%d %d.%d.%d kl.%d.%d %s - %s %d - %d %d", &m_round, &day, &month, &year, &hour, &minute, home, visitor, &home_score, &visitor_score, &spectators);

matches[i].round = m_round;
matches[i].day = day;
matches[i].month = month;
matches[i].year = year;
matches[i].hour = hour;
matches[i].minutes = minute;
matches[i].home_team = home;
matches[i].visitor_team = visitor;
matches[i].home_score = home_score;
matches[i].visitor_score = visitor_score;
matches[i].number_of_spectators = spectators;

但是当我打印出结构时。所有home_team和visitor_team字符串都与我加载的文件中的最后一个字符串相同。就像它们在循环结束时都被更改一样。

这是line[]数组

中最后一行的示例

33 23.05.2012 kl. 20.00 AGF - FCM 0 - 2 12.139

所有home_team和visitor_team都设置为AGF和FCM

Answer 1

您只为home_team和visitor_team分配了一个char。在结构中使用char数组为字符串提供空间：

#define MAX_NAME_BYTES(32) /* include space for nul terminator */
struct match {
    int round;
    int day, month, year;
    int hour, minutes;
    char home_team[MAX_NAME_BYTES];
    char visitor_team[MAX_NAME_BYTES];
    int home_score;
    int visitor_score;
    int number_of_spectators;
};

然后使用strcpy将结果复制到结构中：

strcpy(matches[i].home_team, home);
strcpy(matches[i].visitor_team, visitor);

或者，在结构中使用字符指针（就像现在在编辑的问题中那样）并使用strdup分配它们：

matches[i].home_team = strdup(home);
matches[i].visitor_team = strdup(visitor);

请注意，丢弃结构时，您需要释放这些字符串：

free(matches[i].home_team);
free(matches[i].visitor_team);

struct中的字符串始终相同

1 个答案: