Question

我正在开发阅读库存功能。我希望它读取我放在具有多个文件的项目中的inventory.txt文件中的内容。当我运行它时，我得到所有产品的产品编号的第一个积分值，但是在产品编号之后，我得到了与我的文本文件不匹配的损坏数据。看起来错误现在在我的switch语句中。有没有人看到我试图从我的swith语句中的文本文件中提取数据有什么不对？例如，我的控制台输出如下所示：

1000 1.49 3.79 10 A Fish Food


/* Here's my structure, I have this stored in a header file. */ 
struct inventory_s
{
    int productNumber;
    float mfrPrice;
    float retailPrice;
    int numInStock;
    char liveInv;
    char productName[PRODUCTNAME_SZ];
}; 

/* Here's the text I'm trying to insert from the inventory.txt file (this is my input file*/

1000, 1.49, 3.79, 10, 0, Fish Food
2000, 0.29, 1.59, 100, 1, Angelfish
2001, 0.09, 0.79, 200, 1, Guppy
5000, 2.40, 5.95, 10, 0, Dog Collar Large
6000, 49.99, 129.99, 3, 1, Dalmation Puppy

/* Here's the function I've built so far */

int readInventory(void)
{
    int count = 0; //counts record
    int length = 0; //shows length of string after its read
    int tokenNumber = 0; //shows which token its currently being worked on
    char* token; //token returned by strtok function
    struct inventory_s newInventory; //customer record
    int sz = sizeof(struct inventory_s) * 2; //string size to read
    char str[sz]; //where data is stored

    FILE* inventoryFile = fopen("customer.txt", "r"); //opens and reads file
    if (inventoryFile == NULL) //if file is empty
        {
            printf("Could not open data file\n");
            return -1;
        }
    while (fgets(str, sz, inventoryFile) != NULL) //if file is not empty
    {
        tokenNumber = INVENTORY_FIELD_PRODUCTNUMBER;
        length = strlen(str);
        str[length - 1] = '\0';
        token = strtok(str, ","); //adds space when there is a "," and breaks into individual words
        while (token != NULL)
        {
            switch (tokenNumber)
            {
                case INVENTORY_FIELD_PRODUCTNUMBER:
                    newInventory.productNumber = atoi(token);
                    break;
                case INVENTORY_FIELD_MFRPRICE:
                    newInventory.mfrPrice = atof(token);
                    break;
                case INVENTORY_FIELD_RETAILPRICE:
                    newInventory.retailPrice = atof(token);
                    break;
                case INVENTORY_FIELD_NUMINSTOCK:
                    newInventory.numInStock = atoi(token);
                    break;
                case INVENTORY_FIELD_LIVEINV:
                   (newInventory.liveInv, token);
                   break;
                case INVENTORY_FIELD_PRODUCTNAME:
                   strcpy(newInventory.productName, token);
                   break;
            }
            token = strtok(NULL, ",");
            tokenNumber++; //starts the next inventory

         }
        count++;
        printf("%i %.2f %.2f %i %c %s\n", newInventory.productNumber, newInventory.mfrPrice, newInventory.retailPrice, newInventory.numInStock, newInventory.liveInv, newInventory.productName); //prints out in console


    }
    fclose(inventoryFile);
    return 0;
}

Answer 1

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define INVENTORY_FIELD_PRODUCTNUMBER  1
#define INVENTORY_FIELD_MFRPRICE       2
#define INVENTORY_FIELD_RETAILPRICE    3
#define INVENTORY_FIELD_NUMINSTOCK     4
#define INVENTORY_FIELD_LIVEINV        5
#define INVENTORY_FIELD_PRODUCTNAME    6

//defines the sizes of the contents in the structure
#define PRODUCTNAME_SZ 20

int main()
{
    struct inventory_s
    {
        int productNumber;
        float mfrPrice;
        float retailPrice;
        int numInStock;
        char liveInv;
        char productName[PRODUCTNAME_SZ];
    };

    int count = 0; //counts record
    int length = 0; //shows length of string after its read
    int tokenNumber = 0; //shows which token its currently being worked on
    char* token; //token returned by strtok function
    struct inventory_s newInventory; //customer record
    int sz = sizeof(struct inventory_s) * 2; //string size to read
    char str[sz]; //where data is stored

    FILE* inventoryFile = fopen("inventory.txt", "r"); //opens and reads file
    if (inventoryFile == NULL) //if file is empty
        {
            printf("Could not open data file\n");
            return -1;
        }
     while (fgets(str, sz, inventoryFile) != NULL) //if file is not empty
    {
        tokenNumber = INVENTORY_FIELD_PRODUCTNUMBER;
        length = strlen(str);
        str[length - 1] = '\0';
        token = strtok(str, ","); //adds space when there is a "," and breaks into individual words

        while (token != NULL)
        {
             switch (tokenNumber)
             {
                case INVENTORY_FIELD_PRODUCTNUMBER:
                    newInventory.productNumber = atoi(token);
                    break;
                case INVENTORY_FIELD_MFRPRICE:
                    newInventory.mfrPrice = atof(token);
                    break;
                case INVENTORY_FIELD_RETAILPRICE:
                    newInventory.retailPrice = atof(token);
                    break;
                case INVENTORY_FIELD_NUMINSTOCK:
                    newInventory.numInStock = atoi(token);
                    break;
                case INVENTORY_FIELD_LIVEINV:
                  (newInventory.liveInv, token);
                   break;
                case INVENTORY_FIELD_PRODUCTNAME:
                   strcpy(newInventory.productName, token);
                   break;
            }
            token = strtok(NULL, ",");
            tokenNumber++; //starts the next inventory

        }

        printf("%i %.2f %.2f %i %c %s\n", newInventory.productNumber, newInventory.mfrPrice, newInventory.retailPrice, newInventory.numInStock, newInventory.liveInv, newInventory.productName); //prints out in console
        count++;

    }
    fclose(inventoryFile);
    return 0;
}

运行程序C编程时，文件指针不断打印出错误的数据

1 个答案: