[sane-devel] Options that cannot be controlled

[Ross Vandegrift]

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Hello,

I've been working with libsane, and have discovered that some options
cannot be used to anything.  One cannot get, set or force them to
auto.  For example, option 5 on the sane-test backend, "three-pass" is
one such option.  Sample code demonstrating this is below.  Is this
intentional?  If so, what is the point?

Please keep me CCed, as I am not subscribed.

Thanks,
Ross



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

int main(void) {
  static SANE_Handle h;
  const SANE_Option_Descriptor *desc;
  const SANE_String_Const *x;
  SANE_Status s;
  char *buf;
  SANE_Int i;

  sane_init(NULL, NULL);
  sane_open("test", &h);

  /* "three-pass" is option index 5 for the sane-test backend */
  desc = sane_get_option_descriptor(h, 5);
  printf("name: %s\n", desc->name);
  printf("title: %s\n", desc->title);
  printf("desc: %s\n", desc->desc);

  buf = (char *) malloc((size_t) desc->size);
  s = sane_control_option(h, 5, SANE_ACTION_SET_AUTO, buf, &i);
  printf("Set auto return: %s (info: %d)\n", sane_strstatus(s), i);
  s = sane_control_option(h, 5, SANE_ACTION_GET_VALUE, buf, &i);
  printf("Get value return: %s (info: %d)\n", sane_strstatus(s), i);
  s = sane_control_option(h, 5, SANE_ACTION_SET_VALUE, buf, &i);
  printf("Set value return: %s (info: %d)\n", sane_strstatus(s), i);
}
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