Question

有没有办法一次性导入文本文件中的所有字符串？我想从文本文件中导入所有价格，其中字符串由产品名称和价格本身在同一行中组成。示例：＆＃34; Wood 5 \ nIron 10 \ n＆＃34;。我的职责是：

fp = fopen("prices.txt", "r");
fgets(chestplate, 80, (FILE*)fp);
fgets(helmet, 80, (FILE*)fp);
fclose(fp);

这使得var胸甲＆＃34; Wood 5＆＃34; var head＆＃34; Iron 10＆＃34;，有没有办法循环这个功能所以我不需要一次导入一个？

Answer 1

这是循环文件中所有行的方法。

char string[80];
while (fgets(string, 80, fp)) {
    // Do something to string
}

Answer 2

继续由@Fjotten开始的示例，这里有一些（未经测试，未编译的）代码可以读取单个＆＃34;价格＆＃34;。您将要遍历所有这些，然后将它们存储在您需要的任何数据结构中 - 可能是某种对象数组。

#define ERROR_MSG(...) ... whatever you want ...
#define STREQUAL(a,b) (0 == stricmp(a,b))

typedef struct {
    int wood;
    int iron;
    int bronze;
    int diamond;
} PRICE;

PRICE * get_price(FILE * fp) {
    char line[80];
    int  line_no = 0;
    char units[80];
    int  qty;
    PRICE * price;

    while (fgets(line, sizeof(line), fp)) {
        // Skip over blank lines, comments?

        if (sscanf(line, " %s %d", units, &qty) != 2) {
            ERROR_MSG("sscanf error reading prices, at line %d", line_no);
            continue; // break? exit?
        }

        if ((price = calloc(1, sizeof(PRICE)) == NULL) {
            ERROR_MSG("calloc failure reading prices, at line %d", line_no);
            exit(1);
        }

        if (STREQUAL("wood", units)) {
           price->wood = qty;
        }
        else if (STREQUAL("iron", units)) {
            price->iron = qty;
        }
        // else if ...
        else {
            ERROR_MSG("Unrecognized currency '%s' reading prices, at line %d",
                units, line_no);
            continue;
        }
        return price;
    }
}

typedef enum {
    CHESTPLATE,
    HELMET,
    NUM_TREASURES
} TREASURE_TYPE;

typedef struct {
    TREASURE_TYPE tr_type;
    PRICE *       tr_base_price;
    const char *  tr_name;
} TREASURE;

TREASURE Treasures[NUM_TREASURES];

void get_treasures(prices_file) {
    if ((fp = fopen(prices_file, "r")) == NULL) {
        ERROR_MESSAGE("Unable to open treasure prices file '%s' for reading", prices_file);
        exit(1);
    }

    for (ttype = 0; ttype < NUM_TREASURES; ++ttype) {
        Treasures[ttype].tr_type = ttype;
        Treasures[ttype].tr_base_price = get_price(fp);
        Treasures[ttype].tr_name = "I got nothing!";
    }

    fclose(fp);
}

从c中导入文件中的所有字符串

2 个答案: