Need help! how to store file data in a structure?

[nagarayan]

Need help guys! my problem is i cannot store file data into an array of structures. I can already read the file data and also tokenized it so as to separate data. here is content of the file that i am reading:

200001, hamburger, 30.50
100000, cheeseburger, 21.00

the name of the file is inventory.ini

i can already read the file with this output:

200001
hamburger
30.50

100000
cheeseburger
21.00

i used the strtok() function.

the problem is i cannot store these data in a structure! here is my code:

header file is saved separately but IN THE SAME PATH as to where my code is saved:

typedef struct productDescriptionType 
{
   char inventory_code[7];
   char item_description[20];
   float unit_price;
} INVENTORY;

this is the inventoryStruct.h

this is the main program

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

struct productDescriptionType* product; // inventory array

void printInfo(INVENTORY product)       //just to check if i successfully transferred the file data to the structure. apparently i still cant reach this part. :( 
{
     printf("%s",product.inventory_code);
     printf("%s",product.item_description);
     printf("%f",product.unit_price);    
}

int main()
{
    INVENTORY  prodDesc;    //declare struct 

    int ctr_file;          //sample number of lines in the file

    FILE *ptr;             //pointer to open inventory.ini

    ctr_file = 4;          //sample line number
    int i;   //index for the inventory array

    char tempStorage[30]; //temporary storage of the tokenized data
    char * tokenized;     //tokenized data value is stored in this pointer

    product = (struct productDescriptionType*) malloc(ctr_file * sizeof(struct productDescriptionType)); // allocate memory for the structure

    ptr = fopen("inventory.ini","r");             //read .ini file

    if ( ptr==NULL ) 
    {
         perror("Error...");
         system("pause");
         exit(1);
    }

    for(i = 0;i<ctr_file;i++)
    {
          while (!feof(ptr))
          {
                tokenized = strtok(tempStorage,", ");
          scanf("%s",prodDesc[i].inventory_code); //this is the error! and the next 2 lines!
          scanf("%s",prodDesc[i].item_description);
          scanf("%f",prodDesc[i].unit_price);

          }

    }
    for(i = 0;i<ctr_file;i++) // program can't push through in this part
    {
          printfInfo(prodDesc[i]);
    }
    fclose(ptr);
    system("pause");

}

please help!.my question again is how to store a file data into an array of structures!thanks!

[yellowSnow]

Need help guys! my problem is i cannot store file data into an array of structures. I can already read the file data and also tokenized it so as to separate data. here is content of the file that i am reading:

200001, hamburger, 30.50
100000, cheeseburger, 21.00

the name of the file is inventory.ini

i can already read the file with this output:

200001
hamburger
30.50

100000
cheeseburger
21.00

i used the strtok() function.

the problem is i cannot store these data in a structure! here is my code:

header file is saved separately but IN THE SAME PATH as to where my code is saved:

typedef struct productDescriptionType 
{
   char inventory_code[7];
   char item_description[20];
   float unit_price;
} INVENTORY;

this is the inventoryStruct.h

this is the main program

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

struct productDescriptionType* product; // inventory array

void printInfo(INVENTORY product)       //just to check if i successfully transferred the file data to the structure. apparently i still cant reach this part. :( 
{
     printf("%s",product.inventory_code);
     printf("%s",product.item_description);
     printf("%f",product.unit_price);    
}

int main()
{
    INVENTORY  prodDesc;    //declare struct 

    int ctr_file;          //sample number of lines in the file

    FILE *ptr;             //pointer to open inventory.ini

    ctr_file = 4;          //sample line number
    int i;   //index for the inventory array

    char tempStorage[30]; //temporary storage of the tokenized data
    char * tokenized;     //tokenized data value is stored in this pointer

    product = (struct productDescriptionType*) malloc(ctr_file * sizeof(struct productDescriptionType)); // allocate memory for the structure

    ptr = fopen("inventory.ini","r");             //read .ini file

    if ( ptr==NULL ) 
    {
         perror("Error...");
         system("pause");
         exit(1);
    }

    for(i = 0;i<ctr_file;i++)
    {
          while (!feof(ptr))
          {
                tokenized = strtok(tempStorage,", ");
          scanf("%s",prodDesc[i].inventory_code); //this is the error! and the next 2 lines!
          scanf("%s",prodDesc[i].item_description);
          scanf("%f",prodDesc[i].unit_price);

          }

    }
    for(i = 0;i<ctr_file;i++) // program can't push through in this part
    {
          printfInfo(prodDesc[i]);
    }
    fclose(ptr);
    system("pause");

}

please help!.my question again is how to store a file data into an array of structures!thanks!

Your first issue (why the program won't compile) is you're treating the variable "prodDesc" as an array and it has not been declared as such.

I can't see anywhere in your code (unless I'm going blind) where you are actually reading the file. You use the scanf() function which takes it's input from stdin.

You're using tempStorage in your strtok call, but how is this field being set in the first place?

You have many other errors, but I think it's best that you sort out exactly what you want to do with this program first and learn how to do things like declare an array of structures, read a file, tokenise a string and assign data to structure members.

You need to:

• read a record from the input file (perhaps using the fgets function)
• tokenise the string obtained via the fgets call
• iterate through the tokens and assign each token to a member in your structure.
• repeat until EOF

Whilst developing the program, take small bites. Don't try and write the whole program in one hit. Make sure you are opening/reading the file correctly first. Then learn how to use strtok correctly (a Google will help out). Then learn how to assign data to the member of structure. In each iteration, make sure you have a working program before moving on to writing the next "feature" of the program.

One final thing - when posting code, use code tags.

Cheers
JD

[nagarayan]

Your first issue (why the program won't compile) is you're treating the variable "prodDesc" as an array and it has not been declared as such.

I can't see anywhere in your code (unless I'm going blind) where you are actually reading the file. You use the scanf() function which takes it's input from stdin.

You're using tempStorage in your strtok call, but how is this field being set in the first place?

You have many other errors, but I think it's best that you sort out exactly what you want to do with this program first and learn how to do things like declare an array of structures, read a file, tokenise a string and assign data to structure members.

You need to:

• read a record from the input file (perhaps using the fgets function)
• tokenise the string obtained via the fgets call
• iterate through the tokens and assign each token to a member in your structure.
• repeat until EOF

Whilst developing the program, take small bites. Don't try and write the whole program in one hit. Make sure you are opening/reading the file correctly first. Then learn how to use strtok correctly (a Google will help out). Then learn how to assign data to the member of structure. In each iteration, make sure you have a working program before moving on to writing the next "feature" of the program.

One final thing - when posting code, use code tags.

Cheers
JD

thanks so much JD! anyway i was successful in storing the file in my structure. though the weird thing is the second unit_price amount can't be read by the program! and the program still reads the delimiter (,) in the description part.here is the output:

code: 000001<<<<<<successfuly removed the delimiter
description: hamburger,<<<<<<<<cant remove the delimiter
price: 30.50

code: 000002
description: cheeseburger,
price: 0.00 <<<<<weird output, cant read the price

code: 100001
description: frenchfries,
price: 21.00

code: 200001
description: icedtea,
price: 17.00

anyway the text file is the same<inventory.ini>.and here is my new code:

#include "inventoryStruct.h"    //header file of struct
#include<stdlib.h>
#include<stdio.h>

void printInfo( INVENTORY product ) //function to print the structure data
{
    printf("\ncode: %s\n", product.inventory_code);
    printf("description : %s\n", product.item_description);
    printf("price: %.2f\n",product.unit_price);    
}
int main() 
{       
    INVENTORY prodDesc[5]; //text file has 4 sets of data.i just assumed that i know the size of the file
    int i=0;     

    FILE * ptr;  //pointer to open inventory.ini
    char array[50];
    char * tokenized;

    char price[6];

    ptr = fopen("inventory.ini","r");

    if(ptr == NULL)
    {
           perror("Error..");
           system("pause");
           exit(1);
    }  

    while(!feof(ptr))
    {
            prodDesc[i].inventory_code[strlen(prodDesc[i].inventory_code)-1] = '\0';    //missing link!.haha transferring inventory.ini data to structure
            fscanf(ptr,"%s",prodDesc[i].inventory_code);
            prodDesc[i].item_description[strlen(prodDesc[i].item_description)-1] = '\0'; // tried to remove delimiter for the desciption but the comma can still be seen in the output
            fscanf(ptr,"%s",prodDesc[i].item_description);
            fscanf(ptr,"%s",price);                       // i just treated the unit price as a string
            prodDesc[i].unit_price = atof(price);         // used atof to treat the string unit price as a float



            i++;  //increment index array of struct        
    }
    for ( i = 0; i < 4; i++ ) 
    {
        printInfo(prodDesc[i]);
    }    
    system("pause");
    return 0;
}

i used the same header file for the struct. i didnt used the strtok() anymore.please help :(

[Aia]

nagarayan> please help
If you want to get help, don't ignore the rules. Learn how to post code

[yellowSnow]

nagarayan, I ran your code and for the life of me I don't understand how you think that this program actually works. Generally speaking, the fscanf() function is not a good choice for reading text files.

Please read the suggestions from my previous post again!

Here is some code for you to try. It reads four records (comma delimited), tokenises each record and loads each field into the members of the INVENTORY structure and then prints them to the screen. It doesn't do exactly what you're trying to do but it's close. Make changes to the code to suit your requirements.

Here is the input file (inventory.ini) that I used:

000001,hamburger,30.50
000002,cheeseburger,21.00
100001,frenchfries,21.00
200001,icedtea,17.00

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

typedef struct productDescriptionType {
    char inventory_code[7];
    char item_description[20];
    float unit_price;
} INVENTORY;


int main(void) {

    INVENTORY product;
    FILE *fp;
    char *rec;
    char *token;
    char *flds[3];
    int i;

    if ((fp = fopen("inventory.ini", "r")) == NULL) {
        printf("Error opening file!");
        return EXIT_FAILURE;
    }

    rec = malloc(BUFSIZ);
    while (fgets(rec, BUFSIZ, fp) != NULL) {
        rec[strlen(rec) - 1] = '\0';
        i = 0;
        token = strtok(rec, ",");
        while (token != NULL) {
            flds[i] = token;
            i++;
            token = strtok(NULL, ",");
        }

        strcpy(product.inventory_code, flds[0]);
        strcpy(product.item_description, flds[1]);
        product.unit_price = atof(flds[2]);

        printf("Inventory code = %s\n", product.inventory_code);
        printf("Item description = %s\n", product.item_description);
        printf("Unit price = %.2f\n\n", product.unit_price);
    }

    free(rec);
    fclose(fp);
    return 0;
}

[nagarayan]

nagarayan> please help
If you want to get help, don't ignore the rules. Learn how to post code

im so sorry.lesson learned

[nagarayan]

nagarayan, I ran your code and for the life of me I don't understand how you think that this program actually works. Generally speaking, the fscanf() function is not a good choice for reading text files.

Please read the suggestions from my previous post again!

Here is some code for you to try. It reads four records (comma delimited), tokenises each record and loads each field into the members of the INVENTORY structure and then prints them to the screen. It doesn't do exactly what you're trying to do but it's close. Make changes to the code to suit your requirements.

Here is the input file (inventory.ini) that I used:

000001,hamburger,30.50
000002,cheeseburger,21.00
100001,frenchfries,21.00
200001,icedtea,17.00

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

typedef struct productDescriptionType {
    char inventory_code[7];
    char item_description[20];
    float unit_price;
} INVENTORY;


int main(void) {

    INVENTORY product;
    FILE *fp;
    char *rec;
    char *token;
    char *flds[3];
    int i;

    if ((fp = fopen("inventory.ini", "r")) == NULL) {
        printf("Error opening file!");
        return EXIT_FAILURE;
    }

    rec = malloc(BUFSIZ);
    while (fgets(rec, BUFSIZ, fp) != NULL) {
        rec[strlen(rec) - 1] = '\0';
        i = 0;
        token = strtok(rec, ",");
        while (token != NULL) {
            flds[i] = token;
            i++;
            token = strtok(NULL, ",");
        }

        strcpy(product.inventory_code, flds[0]);
        strcpy(product.item_description, flds[1]);
        product.unit_price = atof(flds[2]);

        printf("Inventory code = %s\n", product.inventory_code);
        printf("Item description = %s\n", product.item_description);
        printf("Unit price = %.2f\n\n", product.unit_price);
    }

    free(rec);
    fclose(fp);
    return 0;
}

your amazing! thanks a lot! my program actually works, though my code is very confusing and i am the only one who understands it :sad: . i declared my structure on a different file as a header. and i just declared #include "<name of header>" which includes the struct declaration. the problems on my code are: the 2nd unit price can't be read and i can't eliminate the comma on the item description. anyway, you solved my problem. thanks a lot! :)