39271b4fe5
Convert enrollment function to return a signed integer, which is negative on error or corresponds into fp_enroll_result otherwise. Now we can treat a 'FAIL' condition differently from an actual error: fail means that enrollment didn't complete because the data was nonsense or whatever (e.g. scanned a different finger for each stage?). Updated upekts accordingly.
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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* Example fingerprint verification program
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* Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <libfprint/fprint.h>
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struct fp_dscv_dev *discover_device(struct fp_dscv_dev **discovered_devs)
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{
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struct fp_dscv_dev *ddev = NULL;
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int i;
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for (i = 0; ddev = discovered_devs[i]; i++) {
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const struct fp_driver *drv = fp_dscv_dev_get_driver(ddev);
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printf("Found device claimed by %s driver\n",
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fp_driver_get_full_name(drv));
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return ddev;
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}
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return ddev;
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}
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struct fp_print_data *enroll(struct fp_dev *dev) {
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struct fp_print_data *enrolled_print = NULL;
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int r;
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printf("You will need to successfully scan your finger %d times to "
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"complete the process.\n", fp_dev_get_nr_enroll_stages(dev));
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do {
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sleep(1);
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printf("\nScan your finger now.\n");
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r = fp_enroll_finger(dev, &enrolled_print);
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if (r < 0) {
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printf("Enroll failed with error %d\n", r);
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return NULL;
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}
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switch (r) {
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case FP_ENROLL_COMPLETE:
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printf("Enroll complete!\n");
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break;
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case FP_ENROLL_FAIL:
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printf("Enroll failed, something wen't wrong :(\n");
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return NULL;
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case FP_ENROLL_PASS:
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printf("Enroll stage passed. Yay!\n");
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break;
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case FP_ENROLL_RETRY:
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printf("Didn't quite catch that. Please try again.\n");
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break;
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case FP_ENROLL_RETRY_TOO_SHORT:
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printf("Your swipe was too short, please try again.\n");
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break;
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case FP_ENROLL_RETRY_CENTER_FINGER:
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printf("Didn't catch that, please center your finger on the "
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"sensor and try again.\n");
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break;
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case FP_ENROLL_RETRY_REMOVE_FINGER:
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printf("Scan failed, please remove your finger and then try "
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"again.\n");
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break;
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}
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} while (r != FP_ENROLL_COMPLETE);
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if (!enrolled_print) {
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fprintf(stderr, "Enroll complete but no print?\n");
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return NULL;
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}
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printf("Enrollment completed!\n");
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return enrolled_print;
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}
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int main(void)
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{
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int r;
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int ret = 1;
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struct fp_dscv_dev *ddev;
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struct fp_dscv_dev **discovered_devs;
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struct fp_dev *dev;
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struct fp_print_data *data;
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r = fp_init();
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if (r < 0) {
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fprintf(stderr, "Failed to initialize libfprint\n");
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exit(1);
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}
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discovered_devs = fp_discover_devs();
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if (!discovered_devs) {
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fprintf(stderr, "Could not discover devices\n");
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exit(1);
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}
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ddev = discover_device(discovered_devs);
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if (!ddev) {
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fprintf(stderr, "No devices detected.\n");
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exit(1);
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}
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dev = fp_dev_open(ddev);
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fp_dscv_devs_free(discovered_devs);
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if (!dev) {
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fprintf(stderr, "Could not open device.\n");
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exit(1);
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}
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printf("Opened device. It's now time to enroll your finger.\n\n");
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data = enroll(dev);
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if (!data)
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goto out_close;
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ret = 0;
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out_close:
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fp_dev_close(dev);
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return ret;
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}
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