Accessing header items by index

This example (hdrlist.c) shows how to access header items by index.

  /*  Local Variables: */
  char value[80], item[30];
  int nitem, i;

  /*  See how many items are present (this also accesses the image). */
  hdrNumb( "in", " ", "*", &nitem, istat );
  for( i=1; i<=nitem; i++ ) {

    /*  Get the name of the I'th header item. */
    hdrName( "in", source, i, item, 30, istat );                     [1]

    /*  Get its value and print out the item name and value. */
    hdrInC( "in", source, item, 1, value, 80, istat );               [1]
    printf( "%s = %s \n", item, value );
  }

The following notes refer to the numbered statements:

1.

Note the extra arguments (30 & 80) that pass the maximum length of the output strings.