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Add a simple example to the documentation

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2013-07-03 15:27:51 +10:00
parent 25a0a65d7f
commit bafd498b67
1 changed files with 40 additions and 0 deletions
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libevdev/libevdev.h
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@ -85,6 +85,46 @@
* *
* libevdev does **not** have knowledge of X clients or Wayland clients, it is * libevdev does **not** have knowledge of X clients or Wayland clients, it is
* too low in the stack. * too low in the stack.
*
* Example
* =======
* Below is a simple example that shows how libevdev could be used. This example
* opens a device, checks for relative axes and a left mouse button and if it
* finds them monitors the device to print the event.
*
* struct libevdev *dev = NULL;
* int fd;
* int rc = 1;
*
* fd = open("/dev/input/event0", O_RDONLY|O_NONBLOCK);
* rc = libevdev_new_from_fd(fd, &dev);
* if (rc < 0) {
* fprintf(stderr, "Failed to init libevdev (%s)\n", strerror(-rc));
* exit(1);
* }
* printf("Input device name: \"%s\"\n", libevdev_get_name(dev));
* printf("Input device ID: bus %#x vendor %#x product %#x\n",
* libevdev_get_bustype(dev),
* libevdev_get_vendor_id(dev),
* libevdev_get_product_id(dev));
* if (!libevdev_has_event_type(dev, EV_REL) ||
* !libevdev_has_event_code(dev, EV_KEY, BTN_LEFT)) {
* printf("This device does not look like a mouse\n");
* exit(1);
* }
*
* do {
* struct input_event ev;
* rc = libevdev_next_event(dev, LIBEVDEV_READ_NORMAL, &ev);
* if (rc == 0)
* printf("Event: %s %s %d\n",
* libevdev_get_event_type_name(ev.type),
* libevdev_get_event_code_name(ev.type, ev.code),
* ev.value);
* } while (rc == 1 || rc == 0 || rc == -EAGAIN);
*
* A more complete example is available with the libevdev-events tool here:
* https://github.com/whot/libevdev/blob/master/tools/libevdev-events.c
*/ */
/** /**