Extracting data from an array in C

I am writing a program in C which will extract data from an array.

The array contains the data: char test[] = "TRACKING ID: 1365 DATE: 20030901 TIME: 1200 ROUTE: 12 DRIVER: 005 STATUS: Nobody present";

What I need to do is extract just the bit of the Tracking ID which says 1365 and store it in a typedef struct and then print the contents of the typedef struct.

This is what I have done so far:

Code:

---

//last updated Monday 6 October 2003

#include <stdio.h>

int main()
{   
//typedef structure to hold Transaction data
typedef struct
{
    int trackingId;
    char transDate[9];
    char transTime[5];
    int route;
    int driver;
    char status[100];
} Transaction;

Transaction transac;

// TEST CODE
char test[] = "TRACKING ID: 1365 DATE: 20030901 TIME: 1200 ROUTE: 12 DRIVER: 005 STATUS: Nobody present";

// EXTRACT THE TRACKING ID AS AN INTEGER and store it in the typedef struct

transac.trackingId = strstr(test, "TRACKING ID"); //NULL if not found
printf(transac.trackingId);



}

---

The problem with this is that it prints out the whole of the contents of the char test[] array, when I really want it to just print out the tracking ID which is 1365.

Thanks for any help.


:)

Try the following:

Replace

Code:

---

transac.trackingId = strstr(test, "TRACKING ID"); //NULL if not found
printf(transac.trackingId);

---

with

Code:

---

char id[20] = {0} ;
char* charFirstOccurence = strstr(test, "TRACKING ID");
strncpy(id,charFirstOccurence,strlen("TRACKING ID") ;
printf(id) ;

---

I don't have a compiler with me...so if code above fails, feel free to curse me. :)

Thanks for your help.

But when I ran the program, it printed out the words "TRACKING ID", when I need it to print the actual tracking ID itself, which in this case is the number 1365.

Oh, I see. Silly me. In that case, its not so easy as I thought. :p

You could parse it for tokens separated by spaces " ". And the 3rd token would contain your numeric ID.

1st Token: TRACKING
2nd Token: ID
3rd Token: 1365

You might also use sscanf to parse the string.

Code:

---

#include <stdio.h>

typedef struct
{
  int  trackingId;
  char transDate[9];
  char transTime[5];
  int  route;
  int  driver;
  char status[100];
} Transaction;

int main(void)
{
  Transaction transac;
  const char test[] = "TRACKING ID: 1365 DATE: 20030901 "
                      "TIME: 1200 ROUTE: 12 DRIVER: 005 "
                      "STATUS: Nobody present";
  if ( sscanf(test, "TRACKING ID: %d DATE: %8s TIME: %4s "
                    "ROUTE: %d DRIVER: %d STATUS: %99[^\n]",
              &transac.trackingId,
                transac.transDate,
                transac.transTime,
              &transac.route,
              &transac.driver,
                transac.status) == 6 )
  {
      printf("TRACKING ID = %d\n",    transac.trackingId);
      printf("DATE        = \"%s\"\n", transac.transDate);
      printf("TIME        = \"%s\"\n", transac.transTime);
      printf("ROUTE      = %d\n",    transac.route);
      printf("DRIVER      = %d\n",    transac.driver);
      printf("STATUS      = \"%s\"\n", transac.status);
  }
  return 0;
}

/* my output
TRACKING ID = 1365
DATE        = "20030901"
TIME        = "1200"
ROUTE      = 12
DRIVER      = 5
STATUS      = "Nobody present"
*/

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[EDIT]Corrected my carelessness.[/EDIT]

Thanks, it's working fine now. :)