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 = NULL;
  28         int i;
  29
  30         for (i = 0; ddev = discovered_devs[i]; i++) {
  31                 struct fp_driver *drv = fp_dscv_dev_get_driver(ddev);
  32                 printf("Found device claimed by %s driver\n",
  33                         fp_driver_get_full_name(drv));
  34                 return ddev;
  35         }
  36
  37         return ddev;
  38 }
  39
  40 int main(void)
  41 {
  42         int r = 1;
  43         struct fp_dscv_dev *ddev;
  44         struct fp_dscv_dev **discovered_devs;
  45         struct fp_dev *dev;
  46         struct fp_img *img = NULL;
  47
  48         r = fp_init();
  49         if (r < 0) {
  50                 fprintf(stderr, "Failed to initialize libfprint\n");
  51                 exit(1);
  52         }
  53
  54         discovered_devs = fp_discover_devs();
  55         if (!discovered_devs) {
  56                 fprintf(stderr, "Could not discover devices\n");
  57                 goto out;
  58         }
  59
  60         ddev = discover_device(discovered_devs);
  61         if (!ddev) {
  62                 fprintf(stderr, "No devices detected.\n");
  63                 goto out;
  64         }
  65
  66         dev = fp_dev_open(ddev);
  67         fp_dscv_devs_free(discovered_devs);
  68         if (!dev) {
  69                 fprintf(stderr, "Could not open device.\n");
  70                 goto out;
  71         }
  72
  73         if (!fp_dev_supports_imaging(dev)) {
  74                 fprintf(stderr, "this device does not have imaging capabilities.\n");
  75                 goto out_close;
  76         }
  77
  78         printf("Opened device. It's now time to scan your finger.\n\n");
  79
  80         r = fp_dev_img_capture(dev, 0, &img);
  81         if (r) {
  82                 fprintf(stderr, "image capture failed, code %d\n", r);
  83                 goto out_close;
  84         }
  85
  86         r = fp_img_save_to_file(img, "finger.pgm");
  87         if (r) {
  88                 fprintf(stderr, "img save failed, code %d\n", r);
  89                 goto out_close;
  90         }
  91
  92         fp_img_standardize(img);
  93         r = fp_img_save_to_file(img, "finger_standardized.pgm");
  94         fp_img_free(img);
  95         if (r) {
  96                 fprintf(stderr, "standardized img save failed, code %d\n", r);
  97                 goto out_close;
  98         }
  99
 100         r = 0;
 101 out_close:
 102         fp_dev_close(dev);
 103 out:
 104         fp_exit();
 105         return r;
 106 }
 107