examples/img_capture.c

   1 /*
   2  * Example libfprint image capture program
   3  * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 #include <libfprint/fprint.h>
  24
  25 struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
  26 {
  27         struct fp_dscv_dev *ddev = discovered_devs[0];
  28         struct fp_driver *drv;
  29         if (!ddev)
  30                 return NULL;
  31
  32         drv = fp_dscv_dev_get_driver(ddev);
  33         printf("Found device claimed by %s driver\n", fp_driver_get_full_name(drv));
  34         return ddev;
  35 }
  36
  37 int main(void)
  38 {
  39         int r = 1;
  40         struct fp_dscv_dev *ddev;
  41         struct fp_dscv_dev **discovered_devs;
  42         struct fp_dev *dev;
  43         struct fp_img *img = NULL;
  44
  45         r = fp_init();
  46         if (r < 0) {
  47                 fprintf(stderr, "Failed to initialize libfprint\n");
  48                 exit(1);
  49         }
  50         fp_set_debug(3);
  51
  52         discovered_devs = fp_discover_devs();
  53         if (!discovered_devs) {
  54                 fprintf(stderr, "Could not discover devices\n");
  55                 goto out;
  56         }
  57
  58         ddev = discover_device(discovered_devs);
  59         if (!ddev) {
  60                 fprintf(stderr, "No devices detected.\n");
  61                 goto out;
  62         }
  63
  64         dev = fp_dev_open(ddev);
  65         fp_dscv_devs_free(discovered_devs);
  66         if (!dev) {
  67                 fprintf(stderr, "Could not open device.\n");
  68                 goto out;
  69         }
  70
  71         if (!fp_dev_supports_imaging(dev)) {
  72                 fprintf(stderr, "this device does not have imaging capabilities.\n");
  73                 goto out_close;
  74         }
  75
  76         printf("Opened device. It's now time to scan your finger.\n\n");
  77
  78         r = fp_dev_img_capture(dev, 0, &img);
  79         if (r) {
  80                 fprintf(stderr, "image capture failed, code %d\n", r);
  81                 goto out_close;
  82         }
  83
  84         r = fp_img_save_to_file(img, "finger.pgm");
  85         if (r) {
  86                 fprintf(stderr, "img save failed, code %d\n", r);
  87                 goto out_close;
  88         }
  89
  90         fp_img_standardize(img);
  91         r = fp_img_save_to_file(img, "finger_standardized.pgm");
  92         fp_img_free(img);
  93         if (r) {
  94                 fprintf(stderr, "standardized img save failed, code %d\n", r);
  95                 goto out_close;
  96         }
  97
  98         r = 0;
  99 out_close:
 100         fp_dev_close(dev);
 101 out:
 102         fp_exit();
 103         return r;
 104 }
 105