Thread: dump the buffer read from binary file

No. My hex editor has taken a dump. I'll have to grab another one.


Edit:
===
Ok, I'm back with a hex editor, and all is well. Have a question for you though.

In the binary file, what's the best way to locate the mark in the file?

With just one record, I can't make a general rule.

Rest of the program is great - you'll be smiling.

Originally Posted by Adak

I'm much too old to be impressed by how correct you think you are.

I'm not here to impress you, or anyone for that matter. I do however feel it necessary to point out the right way to do something. You don't teach that it's fine to modify string literals, when it is undefined behavior.

It's not my fault you use an antiquated compiler that didn't handle it right in the first place. That's like advocating fflush(stdin) just because it works on <random compiler>.


Quzah.

If this is a binary file with fixed lengths records, why do you keep trying to use fscanf? Why aren't you just using fread to read 27 bytes at a time, or 3 bytes, 20 bytes, 4 bytes?


Quzah.

Because I wanted to see if you were awake, of course!

Code:

/* help for r00t on cprogramming forum */

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

#define KeyLen 4
#define NameLen 21

typedef struct
{
  char key[4];
  char name[21];
  int Mark;
}rec;

int main(void) {
  size_t i, j;
  FILE *fp;
  
  rec recs[3];

  /* The fields in the records are fixed width, (the fields are padded
     whenever the data doesn't fill it all the way). I've left them
     at their fixed widths.

     No subtraction to find the Mark is needed that way.
  */

  if((fp = fopen("mu1.bin", "rb")) == NULL) {
    printf("\n Error opening the input file - terminating program\n");
    return 1;
  }
  i = j = 0;
  do {
    j = fread(recs[i].key, KeyLen - 1, 1, fp);
    if(!j) 
      break;
    fread(recs[i].name, NameLen, 1, fp);
    fread(&recs[i].Mark, 4, 1, fp);
    recs[i].key[KeyLen - 1] = '\0';
    recs[i].name[NameLen - 1] = '\0';
    printf("#%d: %s %s %d\n", i, recs[i].key, recs[i].name, recs[i].Mark);
    ++i;
  }while(1);

  fclose(fp);
  printf("\n\n\t\t\t     press enter when ready");
  i = getchar();
  return 0;

}

I only tested this on the one record you posted to rapidshare.