I would like to write a binary image of a structure array to a binary file. I have tried this so far:

 #include <stdio.h>
#include <string.h>
#define NUM 256

const char *fname="binary.bin";


typedef struct foo_s {
  int intA;
  int intB;
  char string[20];
}foo_t;



void main (void)
{
foo_t bar[NUM];

bar[0].intA = 10;
bar[0].intB = 999;
strcpy(bar[0].string,"Hello World!");

Save(bar);
printf("%s written succesfully!\n",fname);


}

int Save(foo_t* pData)
{
  FILE *pFile;
  int ptr = 0;
  int itr = 0;

  pFile = fopen(fname, "w");
  if (pFile == NULL) {
    printf("couldn't open %s\n", fname);
    return;
  }
  for (itr = 0; itr<NUM; itr++) {
    for (ptr=0; ptr<sizeof(foo_t); ptr++)
    {
      fputc((unsigned char)*((&pData[itr])+ptr), pFile);
    }
    fclose(pFile);
  }

}

but the compiler is saying aggregate value used where an integer was expected fputc((unsigned char)*((&pData[itr])+ptr), pFile); and I don't quite understand why, what am I doing wrong?

Thanks!