尝试使用指针打印值时 c 程序失败

Question

当我试图从程序失败的数组中获取值时，我还没有收到任何错误。该程序包含一个函数，用于从文件中读取产品并将它们存储在类型为 typedef structure item 的数组中。

程序是这样的:

item *displayProducts(int balance){
    int row=0;
    char line[MAX_LINE_SIZE + 1]; // ptr to the current input line
    static item products[8];
    FILE *fp;

    fp = fopen("machinedata.txt", "r");
    if (fp == NULL)
    {
        printf("Error while opening the file.\n");
        exit(EXIT_FAILURE);
    }

    while (fgets(line, MAX_LINE_SIZE, fp)) {

        char *next_ptr = NULL;
        char *next_item = strtok_s(line, ",;", &next_ptr);

        while (next_item != NULL){
            char *item_ptr = NULL;
            char *name = strtok_s(next_item, "-", &item_ptr);
            if (name == NULL)
            {
                fprintf(stderr, "Failed to scan name out of [%s]\n", next_item);
                break;
            }
            int price;
            next_item = strtok_s(NULL, " ,", &item_ptr);
            //assert(next_item != NULL);
            if (strcmp(name," ")){
                if (sscanf(next_item, "%d", &price) != 1)
                    fprintf(stderr, "Failed to convert [%s] to integer\n", next_item);
                else if (balance > price){
                    products[row].name = name;
                    products[row].price = price;
                    products[row].product_code = row + 1;
                    printf("%d) %s:%d\n",products[row].product_code, products[row].name, products[row].price);
                    row++;
                }
                next_item = strtok_s(NULL, ",;", &next_ptr);
            }
        }
    }
    fclose(fp);
    return products;
}
void main( int argc, char *argv[]){

    int *ptr_to_balance;
    int balance = atoi(argv[2]);
    ptr_to_balance = &balance;
    item *ptr_to_products;

    Init(argv[1], balance);
    ptr_to_products = displayProducts(balance);
    printf("%s", *(ptr_to_products[2].name));

}

程序将从文件中打印出所有产品，但由于某种原因，程序的最后一行失败了。知道为什么吗？

Answer 1

我觉得，你需要改变

 printf("%s", *(ptr_to_products[2].name));

到

printf("%s", ptr_to_products[2].name);

因为 %s 需要一个 pointer-to-null-terminated char 数组。