Write pointer to file in C

Question

I have a structure:

typedef struct student {
  char *name;
  char *surname;
  int age;
} Student;

I need to write the structure into a bina

Answer 1

You'll have to write out the fields individually, as others have said. One thing which may help reading back the data is to write out the string lengths before each entry, eg.

size_t len;
len = strlen(s->name)+1;
fwrite(&len,sizeof(len),1,stream);
fwrite(s->name,sizeof(*(s->name)),len,stream);
...

Reading back is then a matter of

Student * s = malloc(sizeof(*s));
size_t len;
fread(&len,sizeof(len),1,stream);
s->name = malloc(len);
fread(s->name,sizeof(*(s->name)),len,stream);
...