Thread: reading struct from file

Hello,
I am trying to read a file and input it to a structure
So far I have been able to input first three items
but to input the last item (name) i need to use fgets? becasue the name contains whitespaces
how can I go about this?

Thanks
Sean

Code:

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

typedef struct
{
	int registration_number;
	int year;
	char degree_scheme[20];
	char name[30];

}rec;

int readRec(FILE *fp, rec *record);

int main(void)
{

    FILE *f;
    int i;

    rec recs[10];

    f = fopen ("students.txt", "r" );

    if ( f == NULL ){
	printf("Cannot open record file");
	exit(1);
    }

    for (i = 0; i < 10 && readRec(f, &recs[i]); ++i)
    {
    	printf("%d %d %s %s\n", recs[i].registration_number, recs[i].year, recs[i].degree_scheme, recs[i].name);
    }

    return 0;
}
int readRec(FILE *fp, rec *record)
{
    return fscanf(fp, "%d %d %s", &record->registration_number, &record->year, record->degree_scheme) == 3;
}

sample data

Code:

32553 1 PCS dsgasd sdagasd
32153 2 JHM asdgag sgsd
34662 3 PCS asdg sdgas
36446 1 JHM sgdsga gasdg
23325 3 JHM gdsagasd gasdg
23532 2 JHM asdgsa gsdgsa

I don't see why you can't fscanf() two numbers and three strings. If the name has first name and last name to it, and you want to combine them, then add a blank space to the first name, and strcat() the second name, right behind that space.

Code:

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

int main() {
  int i;
  char fname[20];
  char lname[20];
  printf("\n\n Enter a First Name: ");
  scanf("%s", fname);
  i = strlen(fname);
  fname[i] = ' ';
  fname[i+1] = '\0';
  printf("\n\n Enter a Last Name: ");
  scanf("%s", lname);
  strcat(fname, lname);
  printf("fname: %s   lname: %s", fname, lname);

  i = getchar();
  return 0;
}

The problem with that is if there is a middle name or more than 1 middle name, it wont work
is there any way to implement a fgets()?
I still cant figure out how to

Try this:

Code:

return fscanf(fp, "%d %d %s %[^\n]29s", &record->registration_number, &record->year, record->degree_scheme, record->name) == 4;

This:

Code:

%[^\n]29s

tells fscanf to read up to 29 characters or until it hits a newline. The [] brackets contain the valid characters to read; in this case the use of the ^ -- the negation operator -- says any character is OK EXCEPT a newline.

fgets() doesn't stop when it encounters a white space - that's fscanf(). fgets() continues until either it has reached the number of bytes you set it for, or it runs into a newline.

Did you run into a problem using fgets() for the names?

Code:

  
  return fscanf(fp, "%d %d %s %[^\n]29s", &record->registration_number, &record->year, record->degree_scheme, record->name) == 4;

this works.
although, if the name is blank -- the whole next record is inputted as name.
but thats fine
thanks a lot. saved a lot of time
pc

is there any way to ignore white spaces when using fscanf?

Code:

fscanf(f,"%s",a[i]);