Question

我有这个功能而且不工作，在我调用函数时，在ubuntu中显示Segmentation fault (core dumped)：

void loadSavedGame(char fileName[], struct saveGame *savedGamesReaded[], int *length, int *statusCode){

    char line[500];
    char *token2;
    int x=0;

    *savedGamesReaded = (struct saveGame*)malloc((*length)*sizeof(struct saveGame)); //reserve memory for pointer and array elements

    int j;
    for(j=0; j<*length; j++){
        (*savedGamesReaded)[j].id = (char *)malloc(MAX_STRING*sizeof(char)); 
        (*savedGamesReaded)[j].score = (char *)malloc(MAX_STRING*sizeof(char));
        (*savedGamesReaded)[j].position = (char *)malloc(MAX_STRING*sizeof(char));
        (*savedGamesReaded)[j].maze_level = (char *)malloc(MAX_STRING*sizeof(char));
        (*savedGamesReaded)[j].achievements = (char *)malloc(MAX_STRING*sizeof(char));
        (*savedGamesReaded)[j].time_playing = (char *)malloc(MAX_STRING*sizeof(char));
        (*savedGamesReaded)[j].virtual_players = (char *)malloc(MAX_STRING*sizeof(char));
    }


    while (feof(file) == 0){ //file its a text plane was opened before
        fgets(line,500,file);
        token2 = strtok(line,":");    // Here the program falls on the fourth loop 
        strcpy((*savedGamesReaded)[x].id, token2);
        token2 = strtok(NULL,":");
        strcpy((*savedGamesReaded)[x].score, token2);
        token2 = strtok(NULL,":");
        strcpy((*savedGamesReaded)[x].position, token2);
        token2 = strtok(NULL,":");
        strcpy((*savedGamesReaded)[x].maze_level, token2);
        token2 = strtok(NULL,":");
        strcpy((*savedGamesReaded)[x].achievements, token2);
        token2 = strtok(NULL,":");
        strcpy((*savedGamesReaded)[x].time_playing, token2);
        token2 = strtok(NULL,":");
        strcpy((*savedGamesReaded)[x].virtual_players, token2);
        x++;
    }
    fclose(archivo);


}

我声明了结构：

struct saveGame{
   char *id;
   char *score;
   char *position;
   char *maze_level;
   char *achievements;
   char *time_playing;
   char *virtual_players;
};

我认为strtok无效，但我不知道为什么，令牌中的NULL可能错了？

strcpy((*savedGamesReaded)[x].id, token2);
token2 = strtok(NULL,":");

Answer 1

这条线并没有按照你的想法行事：

while (feof(file) == 0){ //file its a text plane was opened before

feof()仅在达到 EOF后返回true 。见Why is “while ( !feof (file) )” always wrong?

你永远不会检查这条线是否成功：

fgets(line,500,file);

另外，你不能关闭file：

fclose(archivo);

Answer 2

根据您的输入，token2 = strtok(<...>,":");可以返回NULL值，下一行会在尝试复制NULL时产生段错误。您可以添加token2的检查，如果它为NULL则中断。类似的东西：

fgets(line,500,file);
token2 = strtok(line,":");
if(!token2)
    break;

strtok在分配给数组结构时失败

2 个答案: